IEC 61158-6-26:2019
(Main)Industrial communication networks - Fieldbus specifications - Part 6-26: Application layer protocol specification - Type 26 elements
Industrial communication networks - Fieldbus specifications - Part 6-26: Application layer protocol specification - Type 26 elements
IEC 61158-6-26:2019 provides common elements for basic time-critical and non-time-critical messaging communications between application programs in an automation environment and material specific to Type 2 fieldbus. The term “time-critical” is used to represent the presence of a time-window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life.
This International Standard specifies interactions between remote applications and defines the externally visible behavior provided by the Type 2 fieldbus application layer. The purpose of this document is to define the protocol provided to
a) define the wire-representation of the service primitives defined in this document, and
b) define the externally visible behavior associated with their transfer. This document specifies the protocol of the Type 2 fieldbus application layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545).
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 6-26 : Spécification de protocole de couche d’application - Éléments de type 26
L'IEC 61158-6-26:2019 fournit des éléments communs pour les communications de messagerie prioritaires et non prioritaires élémentaires entre les programmes d’application des environnements d’automatisation et le matériel spécifique au bus de terrain de type 26. On utilise le terme "prioritaire" pour traduire la présence d’une fenêtre temporelle, à l’intérieur de laquelle une ou plusieurs actions spécifiées doivent être terminées avec un niveau de certitude défini. Si les actions spécifiées ne sont pas réalisées dans la fenêtre temporelle, les applications demandant les actions risquent de connaître une défaillance, avec les risques que cela comporte pour les équipements, les installations et éventuellement la vie humaine.
La présente norme définit de manière abstraite le comportement, visible par un observateur externe, assuré par les différents Types de la couche Application de bus de terrain, en termes
a) de syntaxe abstraite définissant les unités de données de protocole de la couche Application, transmises entre les entités d'application en communication,
b) de syntaxe de transfert définissant les unités de données de protocole de la couche Application, transmises entre les entités d'application en communication;
c) de diagramme d'états de contexte d'application définissant le comportement de service d'application observable entre les entités d'application en communication; et
d) de diagrammes d'états de relations d'applications définissant le comportement de communication visible entre les entités d'application en communication.
General Information
Relations
Overview
IEC 61158-6-26:2019 is part of the IEC 61158 fieldbus family and specifies the application layer protocol for Type 26 fieldbus elements. The standard defines common elements for both basic time-critical and non-time-critical messaging between application programs in an automation environment, including the wire representation of service primitives and the externally visible behavior for their transfer. It is aligned with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545).
Key Topics
- Fieldbus Application Layer (FAL) syntax - abstract and concrete syntax for Type 26 messages.
- PDU definitions - extensive PDUs including Token, Transparent-msg, Byte/Word block read/write, Network-parameter read/write, Cyclic-data, Trigger, Vendor-specific messages and more.
- Transfer syntax & encoding rules - rules for encoding octet-strings, SEQUENCE, bitstrings and fixed-length values for interoperable wire representation.
- Protocol behavior & state machines - FAL protocol state machine structure, timers, counters and variables (token holding, participation, watchdogs) that govern message sequencing and reliability.
- Network management and topology - logical ring maintenance, node addition/drop-out, successor node handling and node reset/configuration primitives.
- Time-critical messaging considerations - definitions and mechanisms to support operations that must complete within specified time windows to avoid application or safety failures.
Applications
IEC 61158-6-26 is targeted at professionals implementing or integrating industrial communication systems where a Type 2 fieldbus application layer is required:
- Device manufacturers building fieldbus-enabled I/O, controllers, and gateways who need to implement standardized PDUs and encoding for interoperability.
- System integrators and network architects designing industrial networks for factory automation, process control, or safety-critical installations that require deterministic and time-aware messaging.
- Control and safety engineers who must ensure that time-critical actions meet defined windows to reduce risk to equipment, plant operation and personnel.
- Test and certification laboratories performing conformance and interoperability testing against the application layer behavior and wire representation.
Practical benefits include consistent message semantics across vendors, deterministic cyclic-data exchange, robust node management, and a repeatable basis for conformance testing and troubleshooting in industrial automation networks.
Related Standards
- IEC 61158 (Fieldbus specifications) - other parts of the series for lower layers and other types.
- ISO/IEC 7498-1 (OSI Basic Reference Model) and ISO/IEC 9545 (OSI application layer structure) - normative references that shape the protocol structure and abstractions.
For official copies and amendments, obtain IEC 61158-6-26:2019 from the IEC Webstore.
Standards Content (Sample)
IEC 61158-6-26 ®
Edition 1.0 2019-06
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 6-26: Application layer protocol specification – Type 26 elements
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IEC 61158-6-26 ®
Edition 1.0 2019-06
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 6-26: Application layer protocol specification – Type 26 elements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-7016-5
– 2 – IEC 61158-6-26:2019 © IEC 2019
CONTENTS
FOREWORD . 10
INTRODUCTION . 12
1 Scope . 13
1.1 General . 13
1.2 Specifications . 14
1.3 Conformance . 14
2 Normative references . 14
3 Terms, definitions, symbols, abbreviations and conventions . 15
3.1 Terms and definitions from other ISO/IEC standards . 15
3.1.1 Terms and definitions from ISO/IEC 7498-1 . 15
3.1.2 Terms and definitions from ISO/IEC 8822 . 16
3.1.3 Terms and definitions from ISO/IEC 9545 . 16
3.1.4 Terms and definitions from ISO/IEC 8824-1 . 16
3.1.5 Terms and definitions from ISO/IEC 8825-1 . 17
3.2 Type 26 specific terms and definitions . 17
3.3 Abbreviations and symbols . 21
3.4 Conventions . 23
3.4.1 Conventions used in state machines . 23
3.4.2 Convention for abstract syntax description . 24
3.4.3 Convention for reserved bits and octets . 24
3.4.4 Conventions for bit description in octets . 24
4 FAL syntax description . 25
4.1 General . 25
4.2 Overview of Type 26 fieldbus . 26
4.2.1 Application field and Common-memory . 26
4.2.2 Structure of Type 26 protocol . 27
4.2.3 Structure of Type 26 FAL . 28
4.2.4 Data link layer . 29
4.3 Operating principle . 29
4.3.1 Overview . 29
4.3.2 Logical ring maintenance . 30
4.3.3 Node addition . 33
4.3.4 Node in a logical ring . 36
4.3.5 Node drop-out . 36
4.3.6 Data transmission . 37
4.3.7 Data transmission frames . 46
4.4 FAL PDU abstract syntax . 49
4.4.1 Basic abstract syntax . 49
4.4.2 Transparent-msg- PDU . 51
4.4.3 Token-PDU . 51
4.4.4 Participation-req-PDU . 51
4.4.5 Byte-block-read PDUs . 51
4.4.6 Byte-block-write PDUs . 52
4.4.7 Word-block-read PDUs . 52
4.4.8 Word-block-write PDUs . 52
4.4.9 Network-parameter-read PDUs . 52
4.4.10 Network-parameter-write PDUs. 53
4.4.11 Stop-command PDUs . 53
4.4.12 Operation-command PDUs . 53
4.4.13 Profile-read PDUs . 53
4.4.14 Trigger-PDU . 54
4.4.15 Log-data-read PDUs . 54
4.4.16 Log-data-clear PDUs . 54
4.4.17 Message-return PDUs . 54
4.4.18 Vendor-specific-msg PDUs . 55
4.4.19 Start-TK-hld-time-mrmt PDUs . 55
4.4.20 Terminate-TK-hld-time-mrmt PDUs . 55
4.4.21 Start-GP_Comm-sndr-log PDUs . 56
4.4.22 Terminate-GP_Comm-sndr-log PDUs . 56
4.4.23 Set-remote-node-config-para PDUs . 56
4.4.24 Read-rmt-partici-node-mgt-info-para PDUs . 56
4.4.25 Read-rmt- node-mgt-info-para PDUs . 57
4.4.26 Read-rmt-node-set-info-para PDUs . 57
4.4.27 Reset-node PDUs . 57
4.4.28 Cyclic-data PDUs . 57
4.5 Data type assignments . 57
5 Transfer syntax . 59
5.1 Encoding rules . 59
5.1.1 Basic encoding . 59
5.1.2 Fixed length Unsigned encoding . 59
5.1.3 Fixed length BitString encoding . 59
5.1.4 OctetString encoding . 59
5.1.5 SEQUENCE encoding . 60
5.2 PDU elements encoding . 60
5.2.1 FALARHeader . 60
5.2.2 Transparent-msg PDU . 63
5.2.3 Token-PDU . 64
5.2.4 Participation-req-PDU . 65
5.2.5 Byte-block-read PDUs . 66
5.2.6 Byte-block-write PDUs . 67
5.2.7 Word-block-read PDUs . 69
5.2.8 Word-block-write PDUs . 71
5.2.9 Network-parameter-read PDUs . 73
5.2.10 Network-parameter-write PDUs. 76
5.2.11 Stop-command PDUs . 79
5.2.12 Operation-command PDUs . 81
5.2.13 Profile-read PDUs . 83
5.2.14 Trigger-PDU . 85
5.2.15 Log-data-read PDUs . 86
5.2.16 Log-data-clear PDUs . 92
5.2.17 Message-return PDUs . 94
5.2.18 Vendor-specific-msg PDUs . 96
5.2.19 Start-TK-hld-time-mrmt PDUs . 98
5.2.20 Terminate-TK-hld-time-mrmt PDUs . 100
5.2.21 Start-GP_Comm-sndr-log PDUs . 103
5.2.22 Terminate-GP_Comm-sndr-log PDUs . 104
– 4 – IEC 61158-6-26:2019 © IEC 2019
5.2.23 Set-remote-node-config-para PDUs . 107
5.2.24 Read-rmt-partici-node-mgt-info-para PDUs . 110
5.2.25 Read-rmt- node-mgt-info-para PDUs . 112
5.2.26 Read-rmt-node-set-info-para PDUs . 115
5.2.27 Reset-node PDUs . 117
5.2.28 Cyclic-data PDUs . 118
6 FAL protocol state machines structure . 120
6.1 Overview. 120
6.2 Common variables, parameters, timers, counters, lists and queues . 121
6.2.1 V(3CWT), P(3CWT), T(3CWT): Three-lap-time-period-of-the-token-
circulation . 121
6.2.2 V(ACK): ACK received . 121
6.2.3 V(ACK_TN): ACK to this node . 121
6.2.4 V(AWT), P(AWT), T(AWT): Waiting-time-period-for-receiving-message-
acknowledge. 122
6.2.5 V(CBN): Current fragment number for fragmented cyclic-data
transmission . 122
6.2.6 V(CTFG): Cyclic-data fragment transfer . 122
6.2.7 V(CTRen), P (CTRen): Cyclic-data receive enable . 122
6.2.8 V(CTRQ): Cyclic-data transfer request . 122
6.2.9 C(MCNT): Cumulative count of message transmission carried over . 122
6.2.10 V(MCV): Message transmission carried over. 122
6.2.11 V(NMTP): No message transmission in previous cycle . 123
6.2.12 V(MFT), P(MFT), T(MFT): Allowable-minimum-frame-Interval-Time . 123
6.2.13 V(MmtCntType): Measurement control type . 123
6.2.14 V(MRVRQ): Message receive request . 123
6.2.15 V(MSRQ): Message transfer request . 123
6.2.16 Q(MSRXQ): Message-RX-Queue . 123
6.2.17 Q(MTXQ):Message-TX-Queue . 124
6.2.18 V(PAT), P(PAT), T(PAT): Participation-request-frame-acceptance-time . 124
6.2.19 V(PnMgtIF): Participation-node-management-information List . 124
6.2.20 V(PWT), T(PWT): Participation-request-frame-transmission-waiting-time . 124
6.2.21 V(RCT): Allowable-refresh-cycle-time . 124
6.2.22 V(RMT), T(RMT): Refresh-cycle-measurement-time. 124
6.2.23 C(RTX): Retransmission count . 125
6.2.24 V(SEQ): Sequence number value List . 125
6.2.25 V(SN): Successor node . 125
6.2.26 V(SrtMmt): Measurement started . 125
6.2.27 Q(SVRXQ): Server-RX Queue . 125
6.2.28 Q(SVTXQ): Server-TX Queue . 125
6.2.29 V(TBN), P(TBN): Total fragment number of Cyclic-data . 125
6.2.30 V(TDT), P(TDT), T(TDT): Joining-token-detection-time . 125
6.2.31 V(THT), P(THT), T(THT): Token-holding-time . 126
6.2.32 V(TK): Token holding . 126
6.2.33 V(TKH): Token holding node . 126
6.2.34 V(TN): Node identifier number . 126
6.2.35 V(TrWT), T(TrWT): Trigger-frame-transmission-waiting-time . 126
6.2.36 V(TSZ), P(TSZ): Total cyclic-data size . 126
6.2.37 V(TW), P(TW ), T(TW)( ): Token-watchdog-time . 126
6.2.38 V(VSEQ): Version of sequence number value List . 126
6.3 Functions used in state tables . 127
7 FAL service protocol machine (FSPM) . 129
7.1 Overview. 129
7.2 Cyclic-data protocol machine . 130
7.2.1 Overview . 130
7.2.2 Cyclic-data primitives between FAL user and FSPM . 130
7.2.3 State table . 131
7.3 Message data protocol machine . 132
7.3.1 Overview . 132
7.3.2 Message-data primitive between FAL user and FSPM . 132
7.3.3 State table . 136
7.4 Load measurement protocol machine . 144
7.4.1 Overview . 144
7.4.2 Load measurement primitives between FAL user and FSPM . 144
7.4.3 State table . 146
7.5 General purpose communication server protocol machine . 149
7.5.1 Overview . 149
7.5.2 GP command server primitives between FAL user and FSPM . 149
7.5.3 State table . 150
7.6 Network management protocol machine . 152
7.6.1 Overview . 152
7.6.2 Network management primitives . 152
7.6.3 State table . 153
8 Application relationship protocol machine (ARPM) . 155
8.1 Overview. 155
8.2 Cyclic-TX/RX control . 156
8.2.1 Overview . 156
8.2.2 Cyclic-TX/RX control primitives between FSPM and ARPM . 156
8.2.3 State table . 157
8.3 Message-TX/RX control . 157
8.3.1 Overview . 157
8.3.2 Message-TX/RX control primitives between FSPM and ARPM . 158
8.3.3 State table . 158
8.4 Command server TX/RX control . 158
8.4.1 Overview . 158
8.4.2 Command server TX/RX primitives between FSPM and ARPM . 159
8.4.3 State table . 159
8.5 AR control . 160
8.5.1 Overview . 160
8.5.2 AR control primitives between FSPM and ARPM . 160
8.5.3 State table . 160
9 DLL mapping protocol machine (DMPM) . 179
9.1 Overview. 179
9.2 Mapping of DMPM service primitives and DLL service primitives . 179
9.3 Mapping DMPM service port to DL-SAP . 181
9.4 Mapping of Network address to each node . 182
Bibliography . 183
– 6 – IEC 61158-6-26:2019 © IEC 2019
Figure 1 – Bit identification in an octet . 25
Figure 2 – Bit identification in multiple octets (four-octet case) . 25
Figure 3 – Data sharing with the CM . 27
Figure 4 – Protocol stack for Type 26 fieldbus . 28
Figure 5 – The structure of ASEs for Type 26 FAL . 29
Figure 6 – A token circulation on a logical ring . 30
Figure 7 – Logical ring recovery . 32
Figure 8 – An example in case of start simultaneously with another node . 34
Figure 9 – Start alone case . 35
Figure 10 – Node addition: in-ring start-up state . 36
Figure 11 – Data sharing with the CM . 38
Figure 12 – Configuration of the Common-memory . 39
Figure 13 – APDUs of cyclic-data frames containing fragmented data . 40
Figure 14 – Example of sequential diagram of ACK over UDP channel . 43
Figure 15 – Delivery confirmation checked by TCP protocol . 44
Figure 16 – Train of data frames and a token frame . 46
Figure 17 – Frame structure . 47
Figure 18 – Structure of Trans-msgData . 64
Figure 19 – Structure of B_Blk_Rd_rspData with M_RLT = 0 . 67
Figure 20 – Structure of B_Blk_Rd_rspData in case of M_RLT = 1 . 67
Figure 21 – Structure of B_Blk_Wt_reqDat . 69
Figure 22 – Structure of B_Blk_Wt_rspData in case of M_RLT = 1 . 69
Figure 23 – Structure of W_Blk_Rd_rspData with M_RLT = 0 . 71
Figure 24 – Structure of W_Blk_Rd_rspData in case of M_RLT = 1 . 71
Figure 25 – Structure of W_Blk_Wt_reqDat . 73
Figure 26 – Structure of W_Blk_Wt_rspData in case of M_RLT = 1 . 73
Figure 27 – Structure of Net-para-Rd-rspData . 75
Figure 28 – Structure of Net-para-Rd-rspData with M_RLT = 1 . 76
Figure 29 – Structure of Net-para-Wrt-reqData. 78
Figure 30 – Structure of Net-para-Wrt-rspData with M_RLT = 1 . 79
Figure 31 – Structure of Stop-cmdData with M_RLT = 1 . 81
Figure 32 – Structure of Op-cmdData with M_RLT = 1 . 82
Figure 33 – Structure of Profile-readData with M_RLT = 0 . 84
Figure 34 – Structure of Profile-readData with M_RLT = 1 . 85
Figure 35 – Structure of Log-readData with M_RLT = 0 . 88
Figure 36 – Structure of Log-readData with M_RLT = 1 . 92
Figure 37 – Structure of Log-clearData . 93
Figure 38 – Structure of Msg-return-reqData . 95
Figure 39 – Structure of Msg-return-rspData . 95
Figure 40 – Structure of V_msg_reqData . 97
Figure 41 – Structure of V_msg_rspData in case of M_RLT = 0 . 98
Figure 42 – Structure of V_msg_rspData in case of M_RLT = 1 . 98
Figure 43 – Token-holding-time measurement result . 102
Figure 44 – Structure of Sndr-logData . 106
Figure 45 – Structure of Set-remote-node-config-para-ReqData . 108
Figure 46 – Structure of Set-remote-node-config-para-RspData . 109
Figure 47 – Structure of Read-rmt-partici-node-mgt-info-ReqData . 111
Figure 48 – Structure of Read-rmt-partici-node-mgt-info-RspData . 111
Figure 49 – Structure of Rmt-node-mgt-info-paraData . 114
Figure 50 – Structure of Set-info-para-read-data . 116
Figure 51 – Structure of ACKdata . 119
Figure 52 – Relationship between FAL protocol machines . 121
Figure 53 – Overall structure of FSPM . 130
Figure 54 – State transition diagram of Cyclic-data protocol machine. 131
Figure 55 – State transition diagram of Message-data protocol machine . 136
Figure 56 – State transition diagram of Load measurement protocol machine . 146
Figure 57 – State transition diagram of GP-command-server protocol machine . 150
Figure 58 – State transition diagram of Network management protocol machine . 153
Figure 59 – Overall structure of ARPM . 156
Figure 60 – State transition diagram of Cyclic-TX/RX control . 157
Figure 61 – State transition diagram of Message-TX/RX control . 158
Figure 62 – State transition diagram of Command server TX/RX protocol machine . 159
Figure 63 – Overall state transition diagram of AR control protocol machine . 161
Figure 64 – State transition diagram for message-data transmission . 173
Figure 65 – State transition diagram for ACK creation and message-data reception . 176
Figure 66 – Overall structure of DMPM . 179
Figure 67 – DL-SAP mapping . 181
Figure 68 – Structure of IP address . 182
Table 1 – Conventions used for state machines . 23
Table 2 – Conventions used in state machine . 23
Table 3 – Available functions to message-data transfer on UDP channel . 42
Table 4 – Data transmission frame and the TCD value . 47
Table 5 – Upper layer operating condition matrix . 61
Table 6 – Transparent-msg-PDU specific values . 64
Table 7 – Token-PDU specific values . 65
Table 8 – Participation-req -PDU specific values . 65
Table 9 – Byte-block-read-req-PDU specific values . 66
Table 10 – Byte-block-read-rsp-PDU specific values . 66
Table 11 – Byte-block-write-req-PDU specific values . 68
Table 12 – Byte-block-write-rsp-PDU specific values . 68
Table 13 – Word-block-read-req-PDU specific values . 70
Table 14 – Word-block-read-rsp-PDU specific values . 70
Table 15 – Word-block-write-req-PDU specific values . 72
Table 16 – Word-block-write-rsp-PDU specific values . 72
– 8 – IEC 61158-6-26:2019 © IEC 2019
Table 17 – Network-parameter-read-req-PDU specific values . 74
Table 18 – Network-parameter-read-rsp-PDU specific values . 74
Table 19 – Values of data elements of Net-para-Rd-rspData . 76
Table 20 – Network-parameter-write-req-PDU specific values . 77
Table 21 – Network-parameter-write-rsp-PDU specific values . 77
Table 22 – Values of the data elements of Net-para-Wrt-reqData . 78
Table 23 – Stop-command-req-PDU specific values . 79
Table 24 – Stop-command-rsp-PDU specific values . 80
Table 25 – Operation-command-req-PDU specific values . 81
Table 26 – Operation-command-rsp-PDU specific values . 82
Table 27 – Profile-read-req-PDU specific values . 83
Table 28 – Profile-read-rsp-PDU specific values . 83
Table 29 – Trigger-PDU specific values . 86
Table 30 – Log-data-read-req-PDU U specific values . 87
Table 31 – Log-data-read-rsp-PDU specific values . 87
Table 32 – Contents of Log-readData . 88
Table 33 – Log-data-clear-req-PDU specific values . 92
Table 34 – Log-data-clear-rsp-PDU specific values . 93
Table 35 – Message-return-req-PDU specific values . 94
Table 36 – Message-return-rsp-PDU specific values . 94
Table 37 – Vendor-specific-msg-req-PDU specific values . 96
Table 38 – Vendor-specific-msg-rsp-PDU specific values . 96
Table 39 – Start-TK-hld-time-mrmt-req-PDU specific values . 99
Table 40 – Start-TK-hld-time-mrmt-rsp-PDU specific values . 99
Table 41 – Terminate-TK-hld-time-mrmt-req-PDU specific values . 100
Table 42 – Terminate-TK-hld-time-mrmt-rsp-PDU specific values . 101
Table 43 – Value of the data element of TK-hld-timeData . 102
Table 44 – Start-GP_Comm-sndr-log-req-PDU specific values . 103
Table 45 – Start-GP_Comm-sndr-log-rsp-PDU specific values . 104
Table 46 – Terminate-GP_Comm-sndr-log-req-PDU specific values . 104
Table 47 – Terminate-GP_Comm-sndr-log-req-PDU specific values . 105
Table 48 – Value of the data element of Sndr-logData . 106
Table 49 – Set-remote-node-config-para-req-PDU specific values . 107
Table 50 – Set-remote-node-config-para-rsp-PDU specific values . 107
Table 51 – Value of the data element of Set-remote-node-config-para-ReqData . 108
Table 52 – Bit definition of Update flag . 109
Table 53 – Value of the data element of Set-remote-node-config-para-RspData . 109
Table 54 – Read-rmt-partici-node-mgt-info-para-req-PDU specific values . 110
Table 55 – Read-rmt-partici-node-mgt-info-para-rsp-PDU specific values . 110
Table 56 – Value of the data element of Read-rmt-partici-node-mgt-info-RspData . 112
Table 57 – Read-rmt- node-mgt-info-para-req-PDU specific values . 112
Table 58 – Read-rmt- node-mgt-info-para-rsp-PDU specific values . 113
Table 59 – Value of the data element of Rmt-node-mgt-info-paraData . 114
Table 60 – Bit definition of Node status . 115
Table 61 – Read-rmt-node-set-info-para-req-PDU specific values . 115
Table 62 – Read-rmt-node-set-info-para-rsp-PDU specific values . 116
Table 63 – Value of the data element of Set-info-para-read-data . 117
Table 64 – Rest-node-req-PDU specific values . 117
Table 65 – Rest-node-rsp-PDU specific values . 118
Table 66 – Cyclic-data-PDU specific values . 118
Table 67 – Value of the element of ACKdata . 120
Table 68 – Value of R_STSx field . 120
Table 69 – Value of R_STSx field . 122
Table 70 – Functions used in state tables . 127
Table 71 – Cyclic-data primitives between FAL user and FSPM . 130
Table 72 – State table of Cyclic-data protocol machine . 131
Table 73 – Message-data primitives between FAL user and FSPM . 132
Table 74 – State table of Message-data protocol machine . 136
Table 75 – Load measurement primitives between FAL user and FSPM . 145
Table 76 – State table of Load measurement protocol machine. 146
Table 77 – GP command server primitives between FAL user and FSPM . 150
Table 78 – State table of General purpose command server protocol machine . 151
Table 79 – Primitives used in network management protocol machine . 152
Table 80 – State table of Network management protocol machine . 154
Table 81 – Cyclic-TX/RX control primitives between FSPM and ARPM . 157
Table 82 – State table of Cyclic-TX/RX control . 157
Table 83 – Message-TX/RX control primitives between FSPM and ARPM . 158
Table 84 – State table of Message-TX/RX control . 158
Table 85 – Command server TX/RX primitives between FSPM and ARPM . 159
Table 86 – State table of Command server TX/RX protocol machine . 159
Table 87 – AR control primitives between FSPM and ARPM . 160
Table 88 – Overall AR control state table . 162
Table 89 – State table for message-data transmission . 174
Table 90 – State table for ACK creation and message-data reception . 177
Table 91 – Mapping of DMPM primitives and DLL service primitives . 180
Table 92 – Supposed Transport service primitives . 180
Table 93 – Mapping of output and input ports to DL-SAP . 181
– 10 – IEC 61158-6-26:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 6-26: Application layer protocol specification –
Type 26 elements
FOREWORD
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IEC 61158-6-26 ®
Edition 1.0 2019-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 6-26: Application layer protocol specification – Type 26 elements
Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 6-26: Spécification de protocole de couche d’application – Éléments de
type 26
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IEC 61158-6-26 ®
Edition 1.0 2019-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 6-26: Application layer protocol specification – Type 26 elements
Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 6-26: Spécification de protocole de couche d’application – Éléments de
type 26
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-1005-6
– 2 – IEC 61158-6-26:2019 © IEC 2019
CONTENTS
FOREWORD . 10
INTRODUCTION . 12
1 Scope . 13
1.1 General . 13
1.2 Specifications . 14
1.3 Conformance . 14
2 Normative references . 14
3 Terms, definitions, symbols, abbreviations and conventions . 15
3.1 Terms and definitions from other ISO/IEC standards . 15
3.1.1 Terms and definitions from ISO/IEC 7498-1 . 15
3.1.2 Terms and definitions from ISO/IEC 8822 . 16
3.1.3 Terms and definitions from ISO/IEC 9545 . 16
3.1.4 Terms and definitions from ISO/IEC 8824-1 . 16
3.1.5 Terms and definitions from ISO/IEC 8825-1 . 17
3.2 Type 26 specific terms and definitions . 17
3.3 Abbreviations and symbols . 21
3.4 Conventions . 23
3.4.1 Conventions used in state machines . 23
3.4.2 Convention for abstract syntax description . 24
3.4.3 Convention for reserved bits and octets . 24
3.4.4 Conventions for bit description in octets . 24
4 FAL syntax description . 25
4.1 General . 25
4.2 Overview of Type 26 fieldbus . 26
4.2.1 Application field and Common-memory . 26
4.2.2 Structure of Type 26 protocol . 27
4.2.3 Structure of Type 26 FAL . 28
4.2.4 Data link layer . 29
4.3 Operating principle . 29
4.3.1 Overview . 29
4.3.2 Logical ring maintenance . 30
4.3.3 Node addition . 33
4.3.4 Node in a logical ring . 36
4.3.5 Node drop-out . 36
4.3.6 Data transmission . 37
4.3.7 Data transmission frames . 46
4.4 FAL PDU abstract syntax . 49
4.4.1 Basic abstract syntax . 49
4.4.2 Transparent-msg- PDU . 51
4.4.3 Token-PDU . 51
4.4.4 Participation-req-PDU . 51
4.4.5 Byte-block-read PDUs . 51
4.4.6 Byte-block-write PDUs . 52
4.4.7 Word-block-read PDUs . 52
4.4.8 Word-block-write PDUs . 52
4.4.9 Network-parameter-read PDUs . 52
4.4.10 Network-parameter-write PDUs. 53
4.4.11 Stop-command PDUs . 53
4.4.12 Operation-command PDUs . 53
4.4.13 Profile-read PDUs . 53
4.4.14 Trigger-PDU . 54
4.4.15 Log-data-read PDUs . 54
4.4.16 Log-data-clear PDUs . 54
4.4.17 Message-return PDUs . 54
4.4.18 Vendor-specific-msg PDUs . 55
4.4.19 Start-TK-hld-time-mrmt PDUs . 55
4.4.20 Terminate-TK-hld-time-mrmt PDUs . 55
4.4.21 Start-GP_Comm-sndr-log PDUs . 56
4.4.22 Terminate-GP_Comm-sndr-log PDUs . 56
4.4.23 Set-remote-node-config-para PDUs . 56
4.4.24 Read-rmt-partici-node-mgt-info-para PDUs . 56
4.4.25 Read-rmt- node-mgt-info-para PDUs . 57
4.4.26 Read-rmt-node-set-info-para PDUs . 57
4.4.27 Reset-node PDUs . 57
4.4.28 Cyclic-data PDUs . 57
4.5 Data type assignments . 57
5 Transfer syntax . 59
5.1 Encoding rules . 59
5.1.1 Basic encoding . 59
5.1.2 Fixed length Unsigned encoding . 59
5.1.3 Fixed length BitString encoding . 59
5.1.4 OctetString encoding . 59
5.1.5 SEQUENCE encoding . 60
5.2 PDU elements encoding . 60
5.2.1 FALARHeader . 60
5.2.2 Transparent-msg PDU . 63
5.2.3 Token-PDU . 64
5.2.4 Participation-req-PDU . 65
5.2.5 Byte-block-read PDUs . 66
5.2.6 Byte-block-write PDUs . 67
5.2.7 Word-block-read PDUs . 69
5.2.8 Word-block-write PDUs . 71
5.2.9 Network-parameter-read PDUs . 73
5.2.10 Network-parameter-write PDUs. 76
5.2.11 Stop-command PDUs . 79
5.2.12 Operation-command PDUs . 81
5.2.13 Profile-read PDUs . 83
5.2.14 Trigger-PDU . 85
5.2.15 Log-data-read PDUs . 86
5.2.16 Log-data-clear PDUs . 92
5.2.17 Message-return PDUs . 94
5.2.18 Vendor-specific-msg PDUs . 96
5.2.19 Start-TK-hld-time-mrmt PDUs . 98
5.2.20 Terminate-TK-hld-time-mrmt PDUs . 100
5.2.21 Start-GP_Comm-sndr-log PDUs . 103
5.2.22 Terminate-GP_Comm-sndr-log PDUs . 104
– 4 – IEC 61158-6-26:2019 © IEC 2019
5.2.23 Set-remote-node-config-para PDUs . 107
5.2.24 Read-rmt-partici-node-mgt-info-para PDUs . 110
5.2.25 Read-rmt- node-mgt-info-para PDUs . 112
5.2.26 Read-rmt-node-set-info-para PDUs . 115
5.2.27 Reset-node PDUs . 117
5.2.28 Cyclic-data PDUs . 118
6 FAL protocol state machines structure . 120
6.1 Overview. 120
6.2 Common variables, parameters, timers, counters, lists and queues . 121
6.2.1 V(3CWT), P(3CWT), T(3CWT): Three-lap-time-period-of-the-token-
circulation . 121
6.2.2 V(ACK): ACK received . 121
6.2.3 V(ACK_TN): ACK to this node . 121
6.2.4 V(AWT), P(AWT), T(AWT): Waiting-time-period-for-receiving-message-
acknowledge. 122
6.2.5 V(CBN): Current fragment number for fragmented cyclic-data
transmission . 122
6.2.6 V(CTFG): Cyclic-data fragment transfer . 122
6.2.7 V(CTRen), P (CTRen): Cyclic-data receive enable . 122
6.2.8 V(CTRQ): Cyclic-data transfer request . 122
6.2.9 C(MCNT): Cumulative count of message transmission carried over . 122
6.2.10 V(MCV): Message transmission carried over. 122
6.2.11 V(NMTP): No message transmission in previous cycle . 123
6.2.12 V(MFT), P(MFT), T(MFT): Allowable-minimum-frame-Interval-Time . 123
6.2.13 V(MmtCntType): Measurement control type . 123
6.2.14 V(MRVRQ): Message receive request . 123
6.2.15 V(MSRQ): Message transfer request . 123
6.2.16 Q(MSRXQ): Message-RX-Queue . 123
6.2.17 Q(MTXQ):Message-TX-Queue . 124
6.2.18 V(PAT), P(PAT), T(PAT): Participation-request-frame-acceptance-time . 124
6.2.19 V(PnMgtIF): Participation-node-management-information List . 124
6.2.20 V(PWT), T(PWT): Participation-request-frame-transmission-waiting-time . 124
6.2.21 V(RCT): Allowable-refresh-cycle-time . 124
6.2.22 V(RMT), T(RMT): Refresh-cycle-measurement-time. 124
6.2.23 C(RTX): Retransmission count . 125
6.2.24 V(SEQ): Sequence number value List . 125
6.2.25 V(SN): Successor node . 125
6.2.26 V(SrtMmt): Measurement started . 125
6.2.27 Q(SVRXQ): Server-RX Queue . 125
6.2.28 Q(SVTXQ): Server-TX Queue . 125
6.2.29 V(TBN), P(TBN): Total fragment number of Cyclic-data . 125
6.2.30 V(TDT), P(TDT), T(TDT): Joining-token-detection-time . 125
6.2.31 V(THT), P(THT), T(THT): Token-holding-time . 126
6.2.32 V(TK): Token holding . 126
6.2.33 V(TKH): Token holding node . 126
6.2.34 V(TN): Node identifier number . 126
6.2.35 V(TrWT), T(TrWT): Trigger-frame-transmission-waiting-time . 126
6.2.36 V(TSZ), P(TSZ): Total cyclic-data size . 126
6.2.37 V(TW), P(TW ), T(TW)( ): Token-watchdog-time . 126
6.2.38 V(VSEQ): Version of sequence number value List . 126
6.3 Functions used in state tables . 127
7 FAL service protocol machine (FSPM) . 129
7.1 Overview. 129
7.2 Cyclic-data protocol machine . 130
7.2.1 Overview . 130
7.2.2 Cyclic-data primitives between FAL user and FSPM . 130
7.2.3 State table . 131
7.3 Message data protocol machine . 132
7.3.1 Overview . 132
7.3.2 Message-data primitive between FAL user and FSPM . 132
7.3.3 State table . 136
7.4 Load measurement protocol machine . 144
7.4.1 Overview . 144
7.4.2 Load measurement primitives between FAL user and FSPM . 144
7.4.3 State table . 146
7.5 General purpose communication server protocol machine . 149
7.5.1 Overview . 149
7.5.2 GP command server primitives between FAL user and FSPM . 149
7.5.3 State table . 150
7.6 Network management protocol machine . 152
7.6.1 Overview . 152
7.6.2 Network management primitives . 152
7.6.3 State table . 153
8 Application relationship protocol machine (ARPM) . 155
8.1 Overview. 155
8.2 Cyclic-TX/RX control . 156
8.2.1 Overview . 156
8.2.2 Cyclic-TX/RX control primitives between FSPM and ARPM . 156
8.2.3 State table . 157
8.3 Message-TX/RX control . 157
8.3.1 Overview . 157
8.3.2 Message-TX/RX control primitives between FSPM and ARPM . 158
8.3.3 State table . 158
8.4 Command server TX/RX control . 158
8.4.1 Overview . 158
8.4.2 Command server TX/RX primitives between FSPM and ARPM . 159
8.4.3 State table . 159
8.5 AR control . 160
8.5.1 Overview . 160
8.5.2 AR control primitives between FSPM and ARPM . 160
8.5.3 State table . 160
9 DLL mapping protocol machine (DMPM) . 179
9.1 Overview. 179
9.2 Mapping of DMPM service primitives and DLL service primitives . 179
9.3 Mapping DMPM service port to DL-SAP . 181
9.4 Mapping of Network address to each node . 182
Bibliography . 183
– 6 – IEC 61158-6-26:2019 © IEC 2019
Figure 1 – Bit identification in an octet . 25
Figure 2 – Bit identification in multiple octets (four-octet case) . 25
Figure 3 – Data sharing with the CM . 27
Figure 4 – Protocol stack for Type 26 fieldbus . 28
Figure 5 – The structure of ASEs for Type 26 FAL . 29
Figure 6 – A token circulation on a logical ring . 30
Figure 7 – Logical ring recovery . 32
Figure 8 – An example in case of start simultaneously with another node . 34
Figure 9 – Start alone case . 35
Figure 10 – Node addition: in-ring start-up state . 36
Figure 11 – Data sharing with the CM . 38
Figure 12 – Configuration of the Common-memory . 39
Figure 13 – APDUs of cyclic-data frames containing fragmented data . 40
Figure 14 – Example of sequential diagram of ACK over UDP channel . 43
Figure 15 – Delivery confirmation checked by TCP protocol . 44
Figure 16 – Train of data frames and a token frame . 46
Figure 17 – Frame structure . 47
Figure 18 – Structure of Trans-msgData . 64
Figure 19 – Structure of B_Blk_Rd_rspData with M_RLT = 0 . 67
Figure 20 – Structure of B_Blk_Rd_rspData in case of M_RLT = 1 . 67
Figure 21 – Structure of B_Blk_Wt_reqDat . 69
Figure 22 – Structure of B_Blk_Wt_rspData in case of M_RLT = 1 . 69
Figure 23 – Structure of W_Blk_Rd_rspData with M_RLT = 0 . 71
Figure 24 – Structure of W_Blk_Rd_rspData in case of M_RLT = 1 . 71
Figure 25 – Structure of W_Blk_Wt_reqDat . 73
Figure 26 – Structure of W_Blk_Wt_rspData in case of M_RLT = 1 . 73
Figure 27 – Structure of Net-para-Rd-rspData . 75
Figure 28 – Structure of Net-para-Rd-rspData with M_RLT = 1 . 76
Figure 29 – Structure of Net-para-Wrt-reqData. 78
Figure 30 – Structure of Net-para-Wrt-rspData with M_RLT = 1 . 79
Figure 31 – Structure of Stop-cmdData with M_RLT = 1 . 81
Figure 32 – Structure of Op-cmdData with M_RLT = 1 . 82
Figure 33 – Structure of Profile-readData with M_RLT = 0 . 84
Figure 34 – Structure of Profile-readData with M_RLT = 1 . 85
Figure 35 – Structure of Log-readData with M_RLT = 0 . 88
Figure 36 – Structure of Log-readData with M_RLT = 1 . 92
Figure 37 – Structure of Log-clearData . 93
Figure 38 – Structure of Msg-return-reqData . 95
Figure 39 – Structure of Msg-return-rspData . 95
Figure 40 – Structure of V_msg_reqData . 97
Figure 41 – Structure of V_msg_rspData in case of M_RLT = 0 . 98
Figure 42 – Structure of V_msg_rspData in case of M_RLT = 1 . 98
Figure 43 – Token-holding-time measurement result . 102
Figure 44 – Structure of Sndr-logData . 106
Figure 45 – Structure of Set-remote-node-config-para-ReqData . 108
Figure 46 – Structure of Set-remote-node-config-para-RspData . 109
Figure 47 – Structure of Read-rmt-partici-node-mgt-info-ReqData . 111
Figure 48 – Structure of Read-rmt-partici-node-mgt-info-RspData . 111
Figure 49 – Structure of Rmt-node-mgt-info-paraData . 114
Figure 50 – Structure of Set-info-para-read-data . 116
Figure 51 – Structure of ACKdata . 119
Figure 52 – Relationship between FAL protocol machines . 121
Figure 53 – Overall structure of FSPM . 130
Figure 54 – State transition diagram of Cyclic-data protocol machine. 131
Figure 55 – State transition diagram of Message-data protocol machine . 136
Figure 56 – State transition diagram of Load measurement protocol machine . 146
Figure 57 – State transition diagram of GP-command-server protocol machine . 150
Figure 58 – State transition diagram of Network management protocol machine . 153
Figure 59 – Overall structure of ARPM . 156
Figure 60 – State transition diagram of Cyclic-TX/RX control . 157
Figure 61 – State transition diagram of Message-TX/RX control . 158
Figure 62 – State transition diagram of Command server TX/RX protocol machine . 159
Figure 63 – Overall state transition diagram of AR control protocol machine . 161
Figure 64 – State transition diagram for message-data transmission . 173
Figure 65 – State transition diagram for ACK creation and message-data reception . 176
Figure 66 – Overall structure of DMPM . 179
Figure 67 – DL-SAP mapping . 181
Figure 68 – Structure of IP address . 182
Table 1 – Conventions used for state machines . 23
Table 2 – Conventions used in state machine . 23
Table 3 – Available functions to message-data transfer on UDP channel . 42
Table 4 – Data transmission frame and the TCD value . 47
Table 5 – Upper layer operating condition matrix . 61
Table 6 – Transparent-msg-PDU specific values . 64
Table 7 – Token-PDU specific values . 65
Table 8 – Participation-req -PDU specific values . 65
Table 9 – Byte-block-read-req-PDU specific values . 66
Table 10 – Byte-block-read-rsp-PDU specific values . 66
Table 11 – Byte-block-write-req-PDU specific values . 68
Table 12 – Byte-block-write-rsp-PDU specific values . 68
Table 13 – Word-block-read-req-PDU specific values . 70
Table 14 – Word-block-read-rsp-PDU specific values . 70
Table 15 – Word-block-write-req-PDU specific values . 72
Table 16 – Word-block-write-rsp-PDU specific values . 72
– 8 – IEC 61158-6-26:2019 © IEC 2019
Table 17 – Network-parameter-read-req-PDU specific values . 74
Table 18 – Network-parameter-read-rsp-PDU specific values . 74
Table 19 – Values of data elements of Net-para-Rd-rspData . 76
Table 20 – Network-parameter-write-req-PDU specific values . 77
Table 21 – Network-parameter-write-rsp-PDU specific values . 77
Table 22 – Values of the data elements of Net-para-Wrt-reqData . 78
Table 23 – Stop-command-req-PDU specific values . 79
Table 24 – Stop-command-rsp-PDU specific values . 80
Table 25 – Operation-command-req-PDU specific values . 81
Table 26 – Operation-command-rsp-PDU specific values . 82
Table 27 – Profile-read-req-PDU specific values . 83
Table 28 – Profile-read-rsp-PDU specific values . 83
Table 29 – Trigger-PDU specific values . 86
Table 30 – Log-data-read-req-PDU U specific values . 87
Table 31 – Log-data-read-rsp-PDU specific values . 87
Table 32 – Contents of Log-readData . 88
Table 33 – Log-data-clear-req-PDU specific values . 92
Table 34 – Log-data-clear-rsp-PDU specific values . 93
Table 35 – Message-return-req-PDU specific values . 94
Table 36 – Message-return-rsp-PDU specific values . 94
Table 37 – Vendor-specific-msg-req-PDU specific values . 96
Table 38 – Vendor-specific-msg-rsp-PDU specific values . 96
Table 39 – Start-TK-hld-time-mrmt-req-PDU specific values . 99
Table 40 – Start-TK-hld-time-mrmt-rsp-PDU specific values . 99
Table 41 – Terminate-TK-hld-time-mrmt-req-PDU specific values . 100
Table 42 – Terminate-TK-hld-time-mrmt-rsp-PDU specific values . 101
Table 43 – Value of the data element of TK-hld-timeData . 102
Table 44 – Start-GP_Comm-sndr-log-req-PDU specific values . 103
Table 45 – Start-GP_Comm-sndr-log-rsp-PDU specific values . 104
Table 46 – Terminate-GP_Comm-sndr-log-req-PDU specific values . 104
Table 47 – Terminate-GP_Comm-sndr-log-req-PDU specific values . 105
Table 48 – Value of the data element of Sndr-logData . 106
Table 49 – Set-remote-node-config-para-req-PDU specific values . 107
Table 50 – Set-remote-node-config-para-rsp-PDU specific values . 107
Table 51 – Value of the data element of Set-remote-node-config-para-ReqData . 108
Table 52 – Bit definition of Update flag . 109
Table 53 – Value of the data element of Set-remote-node-config-para-RspData . 109
Table 54 – Read-rmt-partici-node-mgt-info-para-req-PDU specific values . 110
Table 55 – Read-rmt-partici-node-mgt-info-para-rsp-PDU specific values . 110
Table 56 – Value of the data element of Read-rmt-partici-node-mgt-info-RspData . 112
Table 57 – Read-rmt- node-mgt-info-para-req-PDU specific values . 112
Table 58 – Read-rmt- node-mgt-info-para-rsp-PDU specific values . 113
Table 59 – Value of the data element of Rmt-node-mgt-info-paraData . 114
Table 60 – Bit definition of Node status . 115
Table 61 – Read-rmt-node-set-info-para-req-PDU specific values . 115
Table 62 – Read-rmt-node-set-info-para-rsp-PDU specific values . 116
Table 63 – Value of the data element of Set-info-para-read-data . 117
Table 64 – Rest-node-req-PDU specific values . 117
Table 65 – Rest-node-rsp-PDU specific values . 118
Table 66 – Cyclic-data-PDU specific values . 118
Table 67 – Value of the element of ACKdata . 120
Table 68 – Value of R_STSx field . 120
Table 69 – Value of R_STSx field . 122
Table 70 – Functions used in state tables . 127
Table 71 – Cyclic-data primitives between FAL user and FSPM . 130
Table 72 – State table of Cyclic-data protocol machine . 131
Table 73 – Message-data primitives between FAL user and FSPM . 132
Table 74 – State table of Message-data protocol machine . 136
Table 75 – Load measurement primitives between FAL user and FSPM . 145
Table 76 – State table of Load me
...
Frequently Asked Questions
IEC 61158-6-26:2019 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Industrial communication networks - Fieldbus specifications - Part 6-26: Application layer protocol specification - Type 26 elements". This standard covers: IEC 61158-6-26:2019 provides common elements for basic time-critical and non-time-critical messaging communications between application programs in an automation environment and material specific to Type 2 fieldbus. The term “time-critical” is used to represent the presence of a time-window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life. This International Standard specifies interactions between remote applications and defines the externally visible behavior provided by the Type 2 fieldbus application layer. The purpose of this document is to define the protocol provided to a) define the wire-representation of the service primitives defined in this document, and b) define the externally visible behavior associated with their transfer. This document specifies the protocol of the Type 2 fieldbus application layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545).
IEC 61158-6-26:2019 provides common elements for basic time-critical and non-time-critical messaging communications between application programs in an automation environment and material specific to Type 2 fieldbus. The term “time-critical” is used to represent the presence of a time-window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life. This International Standard specifies interactions between remote applications and defines the externally visible behavior provided by the Type 2 fieldbus application layer. The purpose of this document is to define the protocol provided to a) define the wire-representation of the service primitives defined in this document, and b) define the externally visible behavior associated with their transfer. This document specifies the protocol of the Type 2 fieldbus application layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545).
IEC 61158-6-26:2019 is classified under the following ICS (International Classification for Standards) categories: 25.040.40 - Industrial process measurement and control; 35.100.70 - Application layer; 35.110 - Networking. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 61158-6-26:2019 has the following relationships with other standards: It is inter standard links to IEC 61158-6-26:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
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