SIST EN 1434-3:2016
(Main)Heat meters - Part 3: Data exchange and interfaces
Heat meters - Part 3: Data exchange and interfaces
This European Standard specifies the general requirements and applies to heat meters. Heat meters are instruments intended for measuring the energy which in a heat-exchange circuit is absorbed (cooling) or given up (heating) by a liquid called the heat-conveying liquid. The meter indicates heat in legal units.
Part 3 specifies the data exchange between a meter and a readout device (POINT / POINT communication). For these applications using the optical readout head, the EN 62056-21 protocol is recommended.
For direct or remote local readout of a single or a few meters via a battery driven readout device, the physical layer of EN 13757-6 (local bus) is recommended.
For bigger networks with up to 250 meters, a master unit with AC mains supply according to EN 13757-2 is necessary to control the M-Bus. For these applications the physical and link layer of EN 13757-2 and the application layer of EN 13757-3 is required.
For wireless meter communications, EN 13757-4 describes several alternatives of walk/drive-by readout via a mobile station or by using stationary receivers or a network. Both unidirectionally and bidirectionally transmitting meters are supported by this standard.
Wärmezähler - Teil 3: Datenaustausch und Schnittstellen
Diese Europäische Norm legt die allgemeinen Anforderungen für Wärmezähler fest. Wärmezähler sind Geräte, die dazu dienen, die Wärmemenge zu messen, die in einem Wärmetauscherkreislauf durch eine als Wärmeträgerflüssigkeit bezeichnete Flüssigkeit aufgenommen (kühlen) oder abgegeben (heizen) wird. Der Wärmezähler zeigt die Wärme in gesetzlichen Einheiten an.
Teil 3 legt den Datenaustausch zwischen einem Zähler und einem Auslesegerät fest (PUNKT/PUNKT Kommunikation). Für diese Anwendungen, die einen optischen Auslesekopf verwenden, wird das Protokoll nach EN 62056 21 empfohlen.
Für direkte oder örtliche Fernauslesung eines einzelnen oder mehreren Zählern über ein batteriebetriebenes Auslesegerät wird die Bitübertragungsschicht nach EN 13757 6 (lokales Bussystem) empfohlen.
Für größere Netzwerke mit bis zu 250 Meter ist eine Master-Einheit mit Wechselstromversorgung nach EN 13757 2 erforderlich, um den M Bus zu steuern. Für diese Anwendungen ist die Bitübertragungs- und Sicherungsschicht nach EN 13757 2 und die Anwendungsschicht nach EN 13757 3 erforderlich.
Für Zählerkommunikation über Funk beschreibt EN 13757 4 mehrere Alternativen des mobilen Auslesens oder durch Verwendung eines ortsfesten Empfängers oder eines Netzwerkes. Sowohl Zähler mit unidirektionaler als auch bidirektional Übertragung werden durch diese Norm beschrieben.
Compteurs d'énergie thermique - Partie 3 : Échange de données et interfaces
La présente Norme européenne spécifie les exigences générales et s'applique aux compteurs d'énergie thermique. Il s'agit d'instruments prévus pour mesurer l’énergie qui, dans un circuit d’échange d’énergie thermique, est absorbée (refroidissement) ou abandonnée (échauffement) par un liquide appelé liquide transmetteur d'énergie thermique. Le compteur indique l’énergie thermique en unités légales.
La Partie 3 spécifie l’échange de données entre un compteur et un dispositif de lecture (communication point à point). Pour les applications qui utilisent une tête de lecture optique, le protocole de l'EN 62056-21 est recommandé.
Pour une lecture directe ou locale à distance d’un seul compteur ou de quelques compteurs par l’intermédiaire d’un dispositif de lecture alimenté par batterie, la couche physique de l’EN 13757-6 (bus local) est recommandée.
Pour les réseaux plus importants comportant jusqu’à 250 compteurs, une unité maître disposant d'une alimentation secteur en courant alternatif conforme à l’EN 13757-2 est nécessaire pour commander le M-bus. Pour ces applications, la couche physique et la couche de liaison de l’EN 13757-2 et la couche d’application de l’EN 13757-3 sont requises.
Pour les communications avec compteurs sans fil, l’EN 13757-4 décrit plusieurs alternatives de lectures à pied/en voiture par l’intermédiaire d’un poste mobile ou en utilisant des récepteurs fixes ou un réseau. Les compteurs à transmission unidirectionnelle et les compteurs à transmission bidirectionnelle sont pris en charge par la présente norme.
Toplotni števci - 3. del: Izmenjava podatkov in vmesniki
Ta evropski standard določa splošne zahteve in se uporablja za toplotne števce. Toplotni števci so instrumenti, namenjeni merjenju energije, ki jo v krogotoku toplotne izmenjave absorbira (hlajenje) ali oddaja (ogrevanje) tekočina, imenovana tekočina za prenos toplote. Števec podaja toploto v predpisanih enotah.
3. del standarda določa izmenjavo podatkov med števcem in napravo za odbiranje (komunikacija tipa TOČKA-TOČKA). Za uporabo z optično glavo za odbiranje se priporoča protokol standarda EN 62056-21.
Za neposredno ali oddaljeno lokalno odbiranje posameznega ali več števcev prek naprave za odbiranje z baterijskim napajanjem se priporoča fizična plast standarda EN 13757-6 (vodilo).
Za večja omrežja do 250 metrov je za nadzor vodila M-Bus potrebna glavna enota z izmeničnim napajanjem v skladu s standardom EN 13757-2. Za te načine uporabe je zahtevana fizična in povezovalna plast glede na standard EN 13757-2 in aplikacijska plast glede na standard EN 13757-3.
Standard EN 13757-4 za brezžične komunikacije števcev opisuje nekatere alternativne možnosti odbiranja med premikanjem po terenu (hoja/vožnja) z mobilno postajo ali prek stacionarnih sprejemnikov ali omrežja. Ta standard podpira števce s komunikacijo v eni ali obeh smereh.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Toplotni števci - 3. del: Izmenjava podatkov in vmesnikiWärmezähler - Teil 3: Datenaustausch und SchnittstellenCompteurs d'énergie thermique - Partie 3 : Échange de données et interfacesHeat meters - Part 3: Data exchange and interfaces17.200.10Toplota. KalorimetrijaHeat. CalorimetryICS:Ta slovenski standard je istoveten z:EN 1434-3:2015SIST EN 1434-3:2016en,fr,de01-februar-2016SIST EN 1434-3:2016SLOVENSKI
STANDARDSIST EN 1434-3:20081DGRPHãþD
SIST EN 1434-3:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1434-3
December
t r s w ICS
s yä t r rä s r Supersedes EN
s v u væ uã t r r zEnglish Version
Heat meters æ Part
uã Data exchange and interfaces Compteurs d 5énergie thermique æ Partie
u ã Échange de données et interfaces
Wärmezähler æ Teil
uã Datenaustausch und Schnittstellen This European Standard was approved by CEN on
t y September
t r s wä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
9
t r s w CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s v u væ uã t r s w ESIST EN 1434-3:2016
EN 1434-3:2015 (E) 2 Contents Page European foreword . 4 1 Scope . 5 2 Normative references . 5 3 Meter interfaces and protocols overview . 6 4 Physical layer . 6 4.1 General . 6 4.2 Physical layer optical interface . 6 4.3 Physical layer M-Bus . 6 4.4 Physical layer wireless interface . 6 4.5 Physical layer current loop interface. 7 4.6 Physical layer Local Bus . 7 5 Link layer . 7 5.1 Link layer optical interface . 7 5.2 Link layer of M-Bus and Local Bus . 7 5.3 Link layer wireless interface . 7 5.4 Link layer current-loop interface . 7 6 Application layer . 8 6.1 Application layer optical interface . 8 6.2 Application layer M-Bus and Local Bus . 9 7 Application . 9 7.1 General . 9 7.2 Physical layer . 9 7.3 Link layer . 9 7.4 Application layer . 9 7.5 Control applications . 9 Annex A (informative)
Recommendation for heat meter test interface . 10 Annex B (informative)
Additional information for heat meters . 11 B.1 Additional information regarding the EN 62056-21 protocol . 11 B.2 Data set . 11 B.3 Coding of the data set identification number . 12 Annex C (informative)
Automatic protocol detection and wake-up for the optical interface . 21 C.1 Introduction . 21 C.2 Trying EN 13757-2 protocol . 21 C.3 Trying the EN 62056-21 protocol . 21 Annex D (informative)
Usage of heat meters in control applications . 23 D.1 Heat meter . 23 D.2 Controller . 24 Annex E (informative)
Protection techniques for M-Bus meters against surge/lightning . 26 SIST EN 1434-3:2016
EN 1434-3:2015 (E) 3 Annex F (informative)
Additional information about the master-unit for the M-Bus . 30 F.1 Master side interface to the M-Bus . 30 F.2 Master side interface for local data read out . 30 F.3 Full size level converter . 31 Bibliography . 33
SIST EN 1434-3:2016
EN 1434-3:2015 (E) 4 European foreword This document (EN 1434-3:2015) has been prepared by Technical Committee CEN/TC 294 “Communication systems for meters”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2016, and conflicting national standards shall be withdrawn at the latest by June 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1434-3:2008. The following significant editorial changes compared to the previous edition have been incorporated in this European Standard: a) update of normative references; b) update of Table 1 “Possible combinations of interfaces and standards”; c) addition of explanations to Table B.1 “Values for "UU", register codes”. EN 1434 consists of the following parts, under the general title "Heat meters": — Part 1: General requirements — Part 2: Constructional requirements — Part 4: Pattern approval tests — Part 5: Initial verification tests — Part 6: Installation, commissioning, operational monitoring and maintenance According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 1434-3:2016
EN 1434-3:2015 (E) 5 1 Scope This European Standard specifies the general requirements and applies to heat meters. Heat meters are instruments intended for measuring the energy which in a heat-exchange circuit is absorbed (cooling) or given up (heating) by a liquid called the heat-conveying liquid. The meter indicates heat in legal units. Part 3 specifies the data exchange between a meter and a readout device (POINT / POINT communication). For these applications using the optical readout head, the EN 62056-21 protocol is recommended. For direct or remote local readout of a single or a few meters via a battery driven readout device, the physical layer of EN 13757-6 (local bus) is recommended. For bigger networks with up to 250 meters, a master unit with AC mains supply according to EN 13757-2 is necessary to control the M-Bus. For these applications the physical and link layer of EN 13757-2 and the application layer of EN 13757-3 is required. For wireless meter communications, EN 13757-4 describes several alternatives of walk/drive-by readout via a mobile station or by using stationary receivers or a network. Both unidirectionally and bidirectionally transmitting meters are supported by this standard. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 13757-2, Communication systems for meters and remote reading of meters — Part 2: Physical and link layer EN 13757-3:2013, Communication systems for meters and remote reading of meters — Part 3: Dedicated application layer EN 13757-4, Communication systems for meters and remote reading of meters — Part 4: Wireless meter readout (Radio meter reading for operation in SRD bands) EN 13757-6, Communication systems for meters — Part 6: Local Bus EN 62056-21:2002, Electricity metering — Data exchange for meter reading, tariff and load control — Part 21: Direct local data exchange (IEC 62056-21:2002) SIST EN 1434-3:2016
EN 1434-3:2015 (E) 6 3 Meter interfaces and protocols overview Table 1 — Possible combinations of interfaces and standards Hardware interface type Recommended standard Alternative standards Optical EN 62056-21:2002, 3.2 EN 13757-2 EN 62056-21:2002, 4.1 M-Bus EN 13757-2 No alternative Wireless EN 13757-4 and EN 13757-5 No alternative Current loop EN 62056-21:2002, 3.1 No alternative Local Bus EN 13757-6 No alternative Application layer (All interfaces) EN 13757-3 EN 13757-1 4 Physical layer 4.1 General A meter can have either none or a number of interfaces to communicate with the outside world. If a meter has an interface in accordance with this standard, it shall fulfil at least one of the following requirements for the physical layer. 4.2 Physical layer optical interface The optical interface is used for local data readout. A hand held unit, equipped with an optical readout head, is temporarily connected to one heat meter and the data is read out, one heat meter at a time. The physical properties of the optical interface are defined in EN 62056-21. 4.3 Physical layer M-Bus The physical layer of the M-Bus is described in EN 13757-2. It can be used for "point to point" or for "multi-point" communication in bus systems. If a heat meter presents more than one unit load to the bus, the number of unit loads has to be shown on the meter documentation as “xUL” where x is the number of unit loads. Only integer values are allowed. Especially in extended installation, meters with an M-Bus interface might need additional protection against surge and lightning. Annex E shows various techniques for either constructing meters with an M-bus interface and integrated enhanced protection elements. In addition, it shows how to construct external protection elements for meters with a standard (unprotected) M-Bus interface. Two variants are given: one (preferred) for situation where a ground connection is available and a variant with weaker protection if no ground connection is available. An enhanced version of the protection additionally protects the meter and its interface from destruction if mains power is connected to the M-Bus terminals of the meter. If the readout frequency of the meter is limited either by software or by the battery capacity, the meter documentation shall signal the readout frequency as “x per day”, “y per h” or “z per min” where x, y or z are the number of readouts within the corresponding period allowed by the software without impairing the battery lifetime. Heat meters with unlimited readout frequency do not need such information. 4.4 Physical layer wireless interface The physical layer wireless interface shall be according to EN 13757-4. SIST EN 1434-3:2016
EN 1434-3:2015 (E) 7 4.5 Physical layer current loop interface Type of signal: 20 mA (CL interface in accordance with EN 62056-21:2002, 4.1 with galvanic separation). Power supply: on the heat meter side, the interface shall be passive. The readout device supplies the necessary power. Connections: via terminals or suitable connectors. 4.6 Physical layer Local Bus The Local Bus is an alternative to the M-Bus. It is restricted to small installations (Mini installation/ meter cluster according to EN 13757-2) and optimized for special battery-driven masters. It does not support meter power supply from the bus. Note that this interface is not compatible with M-Bus masters according to EN 13757-2. Its physical layer is described in EN 13757-6. 5 Link layer 5.1 Link layer optical interface 5.1.1 Link layer optical interface with the EN 13757-2 protocol If the optical interface is used with the EN 13757-2 protocol, a wake-up message can be sent after every idle time of > 330 bit times to the heat meter. The wake up message consists of zeroes and ones alternating at the desired baud rate for a duration of (2,2 ± 0,1) s. After an idle time of 33 bit times to 330 bit times, the communication can start. 5.1.2 Link layer optical interface with the EN 62056-21 protocol The link layer optical interface shall be according to EN 62056-21. 5.1.3 Link layer optical interface with automatic protocol recognition If the user or the handheld unit does not know which of the two alternative protocols a meter uses, it is suggested to use a combined wake-up and recognition sequence as described in the informative Annex C. 5.2 Link layer of M-Bus and Local Bus The link layer of the M-Bus and the Local Bus is described in EN 13757-2. All required functions shall be implemented in a heat meter with an M-Bus or Local Bus connector. If the readout frequency of the meter is limited either by software or by the battery capacity, the meter documentation shall signal the readout frequency as “x per day”, “y per h” or “z per min” where x, y or z are the number of readouts within the corresponding period allowed by the software without impairing the battery lifetime. Heat meters with unlimited readout frequency do not need such information. 5.3 Link layer wireless interface The link layer wireless interface shall be according to EN 13757-4. 5.4 Link layer current-loop interface The link layer current-loop interface shall be according to EN 62056-21:2002, Clause 4 to Clause 5. SIST EN 1434-3:2016
EN 1434-3:2015 (E) 8 6 Application layer 6.1 Application layer optical interface 6.1.1 Protocol modes according to EN 13757-3 for heat meters Further details are given in the section on the application layer of the M-Bus. 6.1.2 Protocol modes according to EN 62056-21 for heat meters 6.1.2.1 General This protocol may be used for the optical interface. The basic rules of the protocol are defined in EN 62056-21. Annex B of that document deals with battery operated devices (i.e. some heat meters). The manufacturer ID (identification) mentioned in EN 62056-21 (three upper case letters) is used for heat meters using this protocol in the same manner. For heat meter manufacturers using the data transmission protocol of EN 13757-3, the EN 62056-21 ID is also used to calculate the ID number described in Clause 6 of this standard. The formula stated in EN 13757-3:2013, 5.6 shall be used (see also Annex B). EN 62056-21 describes various modes of operation. All main modes "A", "B", "C" and "D" are allowed for heat meters. 6.1.2.2 Restrictions for heat meters The EN 62056-21 protocol shall be used with some restrictions. In some cases, EN 62056-21 offers more than one possibility to perform the communication. For communication with heat meters, only the selection described in the following subclauses shall be used. The selection is consistent with EN 62056-21. 6.1.2.3 Calculation of block check character The calculation of the block check character shall always be used for the data message sent from the heat meter to the readout device. 6.1.2.4 Syntax diagram The syntax described in EN 62056-21:2002, 5.5 shall be used for heat meters as follows: — the wake-up message can be sent from the hand held unit to the heat meter to activate the communication facilities in the heat meter; — the data message for heat meters shall start with the STX character and end with the ETX and BCC sequence; — the data block consists of one or more data lines; — each data line may contain up to 78 characters and ends with a CR and LF. 6.1.2.5 Data presentation for heat meter EN 62056-21 does not describe the data presentation of the data message. For users of heat meters from different suppliers, the data coding for data readout application is defined. This data coding shall be used for all modes (A, B, C and D) of the EN 62056-21 protocol. In mode C, it is only used for submode a) "Data readout". The data coding for the other submodes b) "Programming mode" and c) "Supplier specific operation" are a matter of special agreement between supplier and user. SIST EN 1434-3:2016
EN 1434-3:2015 (E) 9 The normative Annex B describes the data set and the coding for the readout application of heat meters using this alternative protocol. 6.2 Application layer M-Bus and Local Bus 6.2.1 General This protocol of EN 13757-3 is recommended for the M-Bus and the Local Bus interface. It can be used for the optical interface alternatively and in this case, the heat meter shall be marked with a label “M-Bus” identifying the protocol. Alternatively, the application layer of EN 13757-1 may also be used. 6.2.2 Coding of data records Of EN 13757-3 only the variable data structure with low byte first multibyte-elements (CI = 72 h) shall be used. 7 Application 7.1 General The application layer (Clause 6) describes how to code telegrams and data elements. The quoted standards contain many different options for different applications. This clause describes which minimum function of the quoted standards shall be implemented in a heat meter according to this standard. 7.2 Physical layer As a minimum, two baud rates of 300 baud and 2 400 baud shall be implemented. If the heat meter does not support automatic baud rate detection, the commands for baud rate switching and fallback shall be implemented. 7.3 Link layer A heat meter shall support both the primary and the secondary addressing via the link layer. The application shall support the assignment of primary addresses via the M-Bus. All application layer command for managing the secondary addressing mode (including the functions of extended secondary addressing) shall be supported. All application layer commands for managing the secondary address shall be supported. When the user is able to change the secondary address of the meter, the commands for the extended secondary addressing mode shall be supported as well. 7.4 Application layer All readout telegrams shall contain at least the standard header with the meter-ID. The minimum variable data element list shall contain the actual accumulated energy. The default unit shall be the unit on the meter display. The minimum resolution of the accumulated energy shall be the same as on the meter display. The minimum value actuality shall be 15 min. The minimum readout frequency is the readout of up to 250 meters in a segment once per day. 7.5 Control applications Meter suitable for control applications shall fulfil, in addition to the minimum requirements of 7.4, the requirements of Annex D. The suitability of a heat meter with M-Bus interface for such applications may only be declared (“Suitable for control applications" Annex D) in the meter description if all these requirements are met. SIST EN 1434-3:2016
EN 1434-3:2015 (E) 10 Annex A (informative)
Recommendation for heat meter test interface Modern heat meters are mainly equipped with CMOS microprocessors with a very low power consumption, allowing battery operation. Testing and adjusting of this type of meters needs a completely different approach. Until now, almost every meter type needed its own test equipment to handle the manufacturer's specific requirements. This is a very complicated and expensive way for users of several types of meters and for initial verification institutes. The more different types of heat meters a user has installed, the more testing equipment he may need. An economical testing of several meters should be possible and an easy adaptation to the existing test bench is of great interest. Since this problem came up, experts have been researching an acceptable solution to it. Details of one example of an acceptable solution are given in AGFW FW 203, "Normierter Wärmezähler-Adapter" [3]. SIST EN 1434-3:2016
EN 1434-3:2015 (E) 11 Annex B (informative)
Additional information for heat meters B.1 Additional information regarding the EN 62056-21 protocol List of "T" group codes. Overview on values in use: — "0" = identification (only in connection with value type 0); — "1" = reserved for electrical energy active; — "2" = reserved for electrical energy reactive; — "3" = reserved for electrical energy reserve; — "4" = not used; — "5" = reserved for energy; — "6" = heat meters; — "7" = gas meters; — "8" = water meters; — "9" = reserved for specific identification number or status information; — "F" = error identification for meters. NOTE This list is taken from "VEÖ Pflichtenheft für Tarifgeräte" [4]. B.2 Data set
Figure B.1 — Signal direction As recommended in EN 62056-21:2002, 5.7 each data set (shown diagrammatically above) consists of: — an identification number with the schematic structure; SIST EN 1434-3:2016
EN 1434-3:2015 (E) 12 — "T" . "UU" . "W" * "VV" or "T" . "UU" . "W" & "VV"; — "(" as a front boundary character for the value and unit information; — "Value": 32 printable characters maximum with the exception of "(", ")", "*", "/" and "!"; decimal points (not commas) shall be included where applicable; — "*" as a separator character between value and unit; this separator is not required if there are no units; — "Units": 16 printable characters maximum, with the exception of "(", ")", "/" and "!"; — ")" as a rear boundary character for the value and unit information. B.3 Coding of the data set identification number B.3.1 Schematic structure
Key 1 group code, 1 digit 6 separator, 1 character only to be used if the 2 separator, decimal point
following value is a stored value: 3 type of register, 1 or 2 digits
* separator: if reset is triggered automatically 4 separator, decimal point
(e.g. RCR, RTC) 5 number of the tariff, 1 digit
& separator: if reset is done manually (e.g. by
e.g. 1 = tariff 1; 2 = tariff 2
push button)
...9 = tariff 9 7 number of pre-stored values, 2 digits, to be used
only if the following value is a stored value Figure B.2 — Schematic structure B.3.2 Values for “T” group code Relevant values for heat meters are: "0" for the identification, "6" to identify a heat meter and "F" to identify an error message. The code "9" can be used for manufacturer specific status information. For additional information refer to B.3.7. B.3.3 Values for "UU", register codes The "UU" consists of a one or two digit number to identify the measured values. The numbers shown in Table B.1 shall be used for heat meters. The heat meter shall at least transmit the values for 0, 8 and 26. SIST EN 1434-3:2016
EN 1434-3:2015 (E) 13 Table B.1 — Values for "UU", register codes Value Explanation 0 In connection with group code "0" for identification Number for meter identification (usually secondary address for M-bus according to EN 13757-3). The value may consist of maximum 20 characters. 1 Reset number (storage number), two digits from 00 to 99 Number of power up cycles. 4 Instantaneous power Instantaneous measured power consumption The numerical value may consist of maximum 6 characters. 6 Maximum value of instantaneous power Maximum measured power value averaged over integration time (UU=35) The numerical value may consist of maximum 6 characters. 8 Energy Total value for billing value energy consumption The numerical value may consist of maximum 9 characters. 10 Date and/or time of last reset Time stamp of last power up cycle Time format may consist of maximum 19 characters. 26 Volume Total value for volume consumption The numerical value may consist of maximum 9 characters. 27 Flow Instantaneous value of measured flow rate The numerical value may consist of maximum 6 characters. 28 Outlet temperature Instantaneous value of outlet temperature The numerical value may consist of maximum 5 characters. 29 Inlet temperature Instantaneous value of inlet temperature The numerical value may consist of maximum 5 characters. 30 Temperature difference Instantaneous value of temperature difference calculated from inlet and outlet temperature The numerical value may consist of maximum 6 characters. SIST EN 1434-3:2016
EN 1434-3:2015 (E) 14 Value Explanation 31 Operation time Accumulated power up time of the meter Time format may consist of maximum 19 characters. 32 Fault time Accumulated time during error states of the meter Time format may consist of maximum 19 characters. 33 Maximum flow rate Maximum measured flow rate averaged over integration time (UU=35) The numerical value may consist of maximum 6 characters. 34 Date and/or time of occurrence Time stamp in combination with maximum instantaneous power (UU=6), maximum flow rate (UU=33), maximum inlet temperature (UU=37) and maximum outlet temperature (UU=38) Time format may consist of maximum 19 characters. 35 Integration time Averaging interval for measured power (UU=4) and flow (UU=27) The highest of the resulting averaged values are maximum power (UU=6), maximum flow rate (UU=33), maximum inlet temperature (UU=37) and maximum outlet temperature (UU=38). Time format may consist of maximum 19 characters. 36 Date and/or time of storage Set date or time stamp in combination with other values Time format may consist of maximum 19 characters. 37 Maximum inlet temperature Maximum measured inlet temperature averaged over integration time (UU=35) The numerical value may consist of maximum 5 characters. 38 Maximum outlet temperature Maximum measured outlet temperature averaged over integration time (UU=35) The numerical value may consist of maximum 5 characters. 39 Average outlet temperature during maximum power Measured outlet temper
...
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Toplotni števci - 3. del: Izmenjava podatkov in vmesnikiWärmezähler - Teil 3: Datenaustausch und SchnittstellenCompteurs d'énergie thermique - Partie 3 : Échange de données et interfacesHeat meters - Part 3: Data exchange and interfaces17.200.10Toplota. KalorimetrijaHeat. CalorimetryICS:Ta slovenski standard je istoveten z:FprEN 1434-3kSIST FprEN 1434-3:2015en,fr,de01-julij-2015kSIST FprEN 1434-3:2015SLOVENSKI
STANDARD
kSIST FprEN 1434-3:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
FINAL DRAFT
FprEN 1434-3
March 2015 ICS 17.200.10 Will supersede EN 1434-3:2008English Version
Heat meters - Part 3: Data exchange and interfaces
Compteurs d'énergie thermique - Partie 3 : Échange de données et interfaces
Wärmezähler - Teil 3: Datenaustausch und Schnittstellen This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee CEN/TC 294.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. FprEN 1434-3:2015 EkSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 2 Contents Page
Foreword .4 1 Scope .5 2 Normative references .5 3 Meter interfaces and protocols overview .5 4 Physical layer .6 4.1 General .6 4.2 Physical layer optical interface .6 4.3 Physical layer M-Bus .6 4.4 Physical layer wireless interface .6 4.5 Physical layer current loop interface .6 4.6 Physical layer Local Bus .6 5 Link layer .7 5.1 Link layer optical interface .7 5.2 Link layer of M-Bus and Local Bus .7 5.3 Link layer wireless interface .7 5.4 Link layer current-loop interface .7 6 Application layer .7 6.1 Application layer optical interface .7 6.2 Application layer M-Bus and Local Bus .8 7 Application .9 7.1 General .9 7.2 Physical layer .9 7.3 Link layer .9 7.4 Application layer .9 7.5 Control applications .9 Annex A (informative)
Recommendation for heat meter test interface . 10 Annex B (informative)
Additional information for heat meters . 11 B.1 Additional information regarding the EN 62056-21 protocol . 11 B.2 Data set . 11 B.3 Coding of the data set identification number . 12 Annex C (informative)
Automatic protocol detection and wake-up for the optical interface . 21 C.1 Introduction . 21 C.2 Trying EN 13757-2 protocol . 21 C.3 Trying the EN 62056-21 protocol . 21 Annex D (informative)
Usage of heat meters in control applications . 23 D.1 Heat meter . 23 D.2 Controller . 24 Annex E (informative)
Protection techniques for M-Bus meters against surge/lightning . 26 Annex F (informative)
Additional information about the master-unit for the M-Bus . 30 F.1 Master side interface to the M-Bus . 30 kSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 3 F.2 Master side interface for local data read out . 30 F.3 Full size level converter . 31 Bibliography . 33
kSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 4 Foreword This document (FprEN 1434-3:2015) has been prepared by Technical Committee CEN/TC 294 “Communication systems for meters and remote reading of meters”, the secretariat of which is held by DIN. This document is currently submitted to the Unique Acceptance Procedure. This document will supersede EN 1434-3:2008. The following significant editorial changes compared to the previous edition have been incorporated in this European Standard: a) update of normative references; b) update of Table 1 “Possible combinations of interfaces and standards”; c) addition of explanations to Table B.1 “Values for "UU", register codes”. EN 1434 consists of the following parts, under the general title "Heat meters": — Part 1: General requirements — Part 2: Constructional requirements — Part 4: Pattern approval tests — Part 5: Initial verification tests — Part 6: Installation, commissioning, operational monitoring and maintenance kSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 5 1 Scope This European Standard specifies the general requirements and applies to heat meters. Heat meters are instruments intended for measuring the energy which in a heat-exchange circuit is absorbed (cooling) or given up (heating) by a liquid called the heat-conveying liquid. The meter indicates heat in legal units. Part 3 specifies the data exchange between a meter and a readout device (POINT / POINT communication). For these applications using the optical readout head, the EN 62056-21 protocol is recommended. For direct or remote local readout of a single or a few meters via a battery driven readout device, the physical layer of EN 13757-6 (local bus) is recommended. For bigger networks with up to 250 meters, a master unit with AC mains supply according to EN 13757-2 is necessary to control the M-Bus. For these applications the physical and link layer of EN 13757-2 and the application layer of EN 13757-3 is required. For wireless meter communications, EN 13757-4 describes several alternatives of walk/drive-by readout via a mobile station or by using stationary receivers or a network. Both unidirectionally and bidirectionally transmitting meters are supported by this standard. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 13757-2, Communication systems for and remote reading of meters - Part 2: Physical and link layer EN 13757-3:2013, Communication systems for and remote reading of meters - Part 3: Dedicated application layer EN 13757-4, Communication systems for meters and remote reading of meters - Part 4: Wireless meter readout (Radio meter reading for operation in SRD bands) EN 13757-6, Communication systems for meters and remote reading of meters - Part 6: Local Bus EN 62056-21:2002, Electricity metering - Data exchange for meter reading, tariff and load control - Part 21: Direct local data exchange (IEC 62056-21:2002) 3 Meter interfaces and protocols overview Table 1 — Possible combinations of interfaces and standards Hardware interface type Recommended standard Alternative standards Optical EN 62056-21:2002, 3.2 EN 13757-2 EN 62056-21:2002, Subclause 4.1 M-Bus EN 13757-2 No alternative Wireless EN 13757-4 and EN 13757-5 No alternative Current loop EN 62056-21:2002, 3.1 No alternative Local Bus EN 13757-6 No alternative Application layer (All interfaces) EN 13757-3 EN 13757-1 kSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 6 4 Physical layer 4.1 General A meter can have either none or a number of interfaces to communicate with the outside world. If a meter has an interface in accordance with this standard, it shall fulfil at least one of the following requirements for the physical layer. 4.2 Physical layer optical interface The optical interface is used for local data readout. A hand held unit, equipped with an optical readout head, is temporarily connected to one heat meter and the data is read out, one heat meter at a time. The physical properties of the optical interface are defined in EN 62056-21. 4.3 Physical layer M-Bus The physical layer of the M-Bus is described in EN 13757-2. It can be used for "point to point" or for "multi-point" communication in bus systems. If a heat meter presents more than one unit load to the bus, the number of unit loads has to be shown on the meter documentation as “xUL” where x is the number of unit loads. Only integer values are allowed. Especially in extended installation, meters with an M-Bus interface might need additional protection against surge and lightning. Annex E shows various techniques for either constructing meters with an M-bus interface and integrated enhanced protection elements. In addition, it shows how to construct external protection elements for meters with a standard (unprotected) M-Bus interface. Two variants are given: one (preferred) for situation where a ground connection is available and a variant with weaker protection if no ground connection is available. An enhanced version of the protection additionally protects the meter and its interface from destruction if mains power is connected to the M-Bus terminals of the meter. If the readout frequency of the meter is limited either by software or by the battery capacity, the meter documentation shall signal the readout frequency as “x per day”, “y per h” or “z per min” where x, y or z are the number of readouts within the corresponding period allowed by the software without impairing the battery lifetime. Heat meters with unlimited readout frequency do not need such information. 4.4 Physical layer wireless interface The physical layer wireless interface shall be according to EN 13757-4. 4.5 Physical layer current loop interface Type of signal: 20 mA (CL interface in accordance with EN 62056-21:2002, 4.1 with galvanic separation). Power supply: on the heat meter side, the interface shall be passive. The readout device supplies the necessary power. Connections: via terminals or suitable connectors. 4.6 Physical layer Local Bus The Local Bus is an alternative to the M-Bus. It is restricted to small installations (Mini installation/ meter cluster according to EN 13757-2) and optimized for special battery-driven masters. It does not support meter power supply from the bus. Note that this interface is not compatible with M-Bus masters according to EN 13757-2. Its physical layer is described in EN 13757-6. kSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 7 5 Link layer 5.1 Link layer optical interface 5.1.1 Link layer optical interface with the EN 13757-2 protocol If the optical interface is used with the EN 13757-2 protocol, a wake-up message can be sent after every idle time of > 330 bit times to the heat meter. The wake up message consists of zeroes and ones alternating at the desired baud rate for a duration of (2,2 ± 0,1) s. After an idle time of 33 bit times to 330 bit times, the communication can start. 5.1.2 Link layer optical interface with the EN 62056-21 protocol The link layer optical interface shall be according to EN 62056-21. 5.1.3 Link layer optical interface with automatic protocol recognition If the user or the handheld unit does not know which of the two alternative protocols a meter uses, it is suggested to use a combined wake-up and recognition sequence as described in the informative Annex C. 5.2 Link layer of M-Bus and Local Bus The link layer of the M-Bus and the Local Bus is described in EN 13757-2. All required functions shall be implemented in a heat meter with an M-Bus or Local Bus connector. If the readout frequency of the meter is limited either by software or by the battery capacity, the meter documentation shall signal the readout frequency as “x per day”, “y per h” or “z per min” where x, y or z are the number of readouts within the corresponding period allowed by the software without impairing the battery lifetime. Heat meters with unlimited readout frequency do not need such information. 5.3 Link layer wireless interface The link layer wireless interface shall be according to EN 13757-4. 5.4 Link layer current-loop interface The link layer current-loop interface shall be according to EN 62056-21:2002, Clause 4 to Clause 5. 6 Application layer 6.1 Application layer optical interface 6.1.1 Protocol modes according to EN 13757-3 for heat meters Further details are given in the section on the application layer of the M-Bus. 6.1.2 Protocol modes according to EN 62056-21 for heat meters 6.1.2.1 General This protocol may be used for the optical interface. The basic rules of the protocol are defined in EN 62056-21. Annex B of that document deals with battery operated devices (i.e. some heat meters). The manufacturer ID (identification) mentioned in EN 62056-21 (three upper case letters) is used for heat meters using this protocol in the same manner. For heat meter manufacturers using the data transmission kSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 8 protocol of EN 13757-3, the EN 62056-21 ID is also used to calculate the ID number described in Clause 6 of this standard. The formula stated in EN 13757-3:2013, 5.6 shall be used (see also Annex B). EN 62056-21 describes various modes of operation. All main modes "A", "B", "C" and "D" are allowed for heat meters. 6.1.2.2 Restrictions for heat meters The EN 62056-21 protocol shall be used with some restrictions. In some cases, EN 62056-21 offers more than one possibility to perform the communication. For communication with heat meters, only the selection described in the following subclauses shall be used. The selection is consistent with EN 62056-21. 6.1.2.3 Calculation of block check character The calculation of the block check character shall always be used for the data message sent from the heat meter to the readout device. 6.1.2.4 Syntax diagram The syntax described in EN 62056-21:2002, 5.5 shall be used for heat meters as follows: — the wake-up message can be sent from the hand held unit to the heat meter to activate the communication facilities in the heat meter; — the data message for heat meters shall start with the STX character and end with the ETX and BCC sequence; — the data block consists of one or more data lines; — each data line may contain up to 78 characters and ends with a CR and LF. 6.1.2.5 Data presentation for heat meter EN 62056-21 does not describe the data presentation of the data message. For users of heat meters from different suppliers, the data coding for data readout application is defined. This data coding shall be used for all modes (A, B, C and D) of the EN 62056-21 protocol. In mode C, it is only used for submode a) "Data readout". The data coding for the other submodes b) "Programming mode" and c) "Supplier specific operation" are a matter of special agreement between supplier and user. The normative Annex B describes the data set and the coding for the readout application of heat meters using this alternative protocol. 6.2 Application layer M-Bus and Local Bus 6.2.1 General This protocol of EN 13757-3 is recommended for the M-Bus and the Local Bus interface. It can be used for the optical interface alternatively and in this case, the heat meter shall be marked with a label “M-Bus” identifying the protocol. Alternatively, the application layer of EN 13757-1 may also be used. 6.2.2 Coding of data records Of EN 13757-3 only the variable data structure with low byte first multibyte-elements (CI = 72 h) shall be used. kSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 9 7 Application 7.1 General The application layer (Clause 6) describes how to code telegrams and data elements. The quoted standards contain many different options for different applications. This clause describes which minimum function of the quoted standards shall be implemented in a heat meter according to this standard. 7.2 Physical layer As a minimum, two baud rates of 300 baud and 2 400 baud shall be implemented. If the heat meter does not support automatic baud rate detection, the commands for baud rate switching and fallback shall be implemented. 7.3 Link layer A heat meter shall support both the primary and the secondary addressing via the link layer. The application shall support the assignment of primary addresses via the M-Bus. All application layer command for managing the secondary addressing mode (including the functions of extended secondary addressing) shall be supported. All application layer commands for managing the secondary address shall be supported. When the user is able to change the secondary address of the meter, the commands for the extended secondary addressing mode shall be supported as well. 7.4 Application layer All readout telegrams shall contain at least the standard header with the meter-ID. The minimum variable data element list shall contain the actual accumulated energy. The default unit shall be the unit on the meter display. The minimum resolution of the accumulated energy shall be the same as on the meter display. The minimum value actuality shall be 15 min. The minimum readout frequency is the readout of up to 250 meters in a segment once per day. 7.5 Control applications Meter suitable for control applications shall fulfil, in addition to the minimum requirements of 7.4, the requirements of Annex D. The suitability of a heat meter with M-Bus interface for such applications may only be declared (“Suitable for control applications" Annex D) in the meter description if all these requirements are met. kSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 10 Annex A (informative)
Recommendation for heat meter test interface Modern heat meters are mainly equipped with CMOS microprocessors with a very low power consumption, allowing battery operation. Testing and adjusting of this type of meters needs a completely different approach. Until now, almost every meter type needed its own test equipment to handle the manufacturer's specific requirements. This is a very complicated and expensive way for users of several types of meters and for initial verification institutes. The more different types of heat meters a user has installed, the more testing equipment he may need. An economical testing of several meters should be possible and an easy adaptation to the existing test bench is of great interest. Since this problem came up, experts have been researching an acceptable solution to it. Details of one example of an acceptable solution are given in AGFW FW 203, "Normierter Wärmezähler-Adapter" [3]. kSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 11 Annex B (informative)
Additional information for heat meters B.1 Additional information regarding the EN 62056-21 protocol List of "T" group codes. Overview on values in use: — "0" = identification (only in connection with value type 0); — "1" = reserved for electrical energy active; — "2" = reserved for electrical energy reactive; — "3" = reserved for electrical energy reserve; — "4" = not used; — "5" = reserved for energy; — "6" = heat meters; — "7" = gas meters; — "8" = water meters; — "9" = reserved for specific identification number or status information; — "F" = error identification for meters. NOTE This list is taken from "VEÖ Pflichtenheft für Tarifgeräte" [4]. B.2 Data set
Figure B.1 — Signal direction As recommended in EN 62056-21:2002, 5.7 each data set (shown diagrammatically above) consists of: — an identification number with the schematic structure; kSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 12 — "T" . "UU" . "W" * "VV" or "T" . "UU" . "W" & "VV"; — "(" as a front boundary character for the value and unit information; — "Value": 32 printable characters maximum with the exception of "(", ")", "*", "/" and "!"; decimal points (not commas) shall be included where applicable; — "*" as a separator character between value and unit; this separator is not required if there are no units; — "Units": 16 printable characters maximum, with the exception of "(", ")", "/" and "!"; — ")" as a rear boundary character for the value and unit information. B.3 Coding of the data set identification number B.3.1 Schematic structure
Key 1 group code, 1 digit 6 separator, 1 character only to be used if the 2 separator, decimal point
following value is a stored value: 3 type of register, 1 or 2 digits
* separator: if reset is triggered automatically 4 separator, decimal point
(e.g. RCR, RTC) 5 number of the tariff, 1 digit
& separator: if reset is done manually (e.g. by
e.g. 1 = tariff 1; 2 = tariff 2
push button)
...9 = tariff 9 7 number of pre-stored values, 2 digits, to be used
only if the following value is a stored value Figure B.2 — Schematic structure B.3.2 Values for “T” group code Relevant values for heat meters are: "0" for the identification, "6" to identify a heat meter and "F" to identify an error message. The code "9" can be used for manufacturer specific status information. For additional information refer to B.3.7. B.3.3 Values for "UU", register codes The "UU" consists of a one or two digit number to identify the measured values. The numbers shown in Table B.1 shall be used for heat meters. The heat meter shall at least transmit the values for 0, 8 and 26. kSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 13 Table B.1 — Values for "UU", register codes Value Explanation 0 In connection with group code "0" for identification Number for meter identification (usually secondary address for M-bus according to EN 13757-3). The value may consist of maximum 20 characters. 1 Reset number (storage number), two digits from 00 to 99 Number of power up cycles. 4 Instantaneous power Instantaneous measured power consumption The numerical value may consist of maximum 6 characters. 6 Peak value of instantaneous power Maximum measured power value averaged over integration time (UU=35) The numerical value may consist of maximum 6 characters. 8 Energy Total value for billing value energy consumption The numerical value may consist of maximum 9 characters. 10 Date and/or time of last reset Time stamp of last power up cycle Time format may consist of maximum 19 characters. 26 Volume Total value for volume consumption The numerical value may consist of maximum 9 characters. 27 Flow Instantaneous value of measured flow rate The numerical value may consist of maximum 6 characters. 28 Outlet temperature Instantaneous value of outlet temperature The numerical value may consist of maximum 5 characters. 29 Inlet temperature Instantaneous value of inlet temperature The numerical value may consist of maximum 5 characters. 30 Temperature difference Instantaneous value of temperature difference calculated from inlet and outlet temperature The numerical value may consist of maximum 6 characters. kSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 14 Value Explanation 31 Operation time Accumulated power up time of the meter Time format may consist of maximum 19 characters. 32 Fault time Accumulated time during error states of the meter Time format may consist of maximum 19 characters. 33 Peak flow rate Maximum measured flow rate averaged over integration time (UU=35) The numerical value may consist of maximum 6 characters. 34 Date and/or time of occurrence Time stamp in combination with peak instantaneous power (UU=6), peak flow rate (UU=33), peak inlet temperature (UU=37) and peak outlet temperature (UU=38) Time format may consist of maximum 19 characters. 35 Integration time Averaging interval for measured power (UU=4) and flow (UU=27) The highest of the resulting averaged values are peak power (UU=6), peak flow rate (UU=33), peak inlet temperature (UU=37) and peak outlet temperature (UU=38). Time format may consist of maximum 19 characters. 36 Date and/or time of storage Set date or time stamp in combination with other values Time format may consist of maximum 19 characters. 37 Peak inlet temperature Maximum measured inlet temperature averaged over integration time (UU=35) The numerical value may consist of maximum 5 characters. 38 Peak outlet temperature Maximum measured outlet temperature averaged over integration time (UU=35) The numerical value may consist of maximum 5 characters. 39 Average outlet temperature during peak power Measured outlet temperature averaged over integration time (UU=35) This value is calculated in the integration interval that corresponds to peak power (UU=6). The numerical value may consist of maximum 5 characters. 40 Average outlet temperature during peak flow Measured outlet temperature averaged over integration time (UU=35) This value is calculated in the integration interval that corresponds to peak flow (UU=37). The numerical value may consist of maximum 5 characters. kSIST FprEN 1434-3:2015
FprEN 1434-3:2015 (E) 15 Value Explanation 41 Instantaneous additio
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.