IEC 60870-5-6:2006

IEC 60870-5-6 ®
Edition 1.0 2006-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Telecontrol equipment and systems –
Part 5-6: Guidelines for conformance testing for the IEC 60870-5 companion
standards
Matériels et systèmes de téléconduite –
Partie 5-6: Lignes directrices pour les essais de conformité des normes
d’accompagnement IEC 60870-5
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IEC 60870-5-6 ®
Edition 1.0 2006-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Telecontrol equipment and systems –

Part 5-6: Guidelines for conformance testing for the IEC 60870-5 companion

standards
Matériels et systèmes de téléconduite –

Partie 5-6: Lignes directrices pour les essais de conformité des normes

d’accompagnement IEC 60870-5
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.200 ISBN 978-2-8322-4452-4

– 2 – IEC 60870-5-6:2006  IEC 2006
CONTENTS
FOREWORD . 3
INTRODUCTION . 5

1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Abbreviations . 11
5 Conformance testing . 12
5.1 General . 12
5.2 Conformance test procedures . 12
5.3 Quality assurance and testing . 13
5.4 Quality plan . 13
5.5 Testing . 14
5.6 Testing process . 18
5.7 Documentation . 20

Bibliography . 22

Figure 1 – Conceptual conformance assessment process . 16
Figure 2 – Testing process. 18
Figure 3 – Quality program . 19

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TELECONTROL EQUIPMENT AND SYSTEMS –

Part 5-6: Guidelines for conformance testing for
the IEC 60870-5 companion standards

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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8) Attention is drawn to the normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60870-5-6 has been prepared by IEC technical committee 57:
Power systems management and associated information exchange.
This bilingual version (2017-06) corresponds to the English version, published in 2006-03.
The text of this standard is based on the following documents:
FDIS Report on voting
57/792/FDIS 57/807/RVD
Full information on the voting for the approval of this part of IEC 60870-5 can be found in the
report on voting indicated in the above table.
The French version of this standard has not been voted upon.

– 4 – IEC 60870-5-6:2006  IEC 2006
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 60870-5 consists of the following parts, under the general title Telecontrol equipment and
systems – Part 5: Transmission protocols:
Part 5-1: Transmission frame formats
Part 5-2: Link transmission procedures
Part 5-3: General structure of application data
Part 5-4: Definition and coding of application information elements
Part 5-5: Basic application functions
Part 5-6: Guidelines for conformance testing for the IEC 60870-5 companion standards
Part 5-101: Companion standard for basic telecontrol tasks
Part 5-102 Companion standard for the transmission of integrated totals in electric power
systems
Part 5-103: Companion standard for the informative interface of protection equipment
Part 5-104: Network access for IEC 60870-5-101 using standard transport profiles
Part 5-601: Conformance test cases for the IEC 60870-5-101 companion standard
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
INTRODUCTION
This part of IEC 60870-5 specifies methods and procedures for conformance testing of
Telecontrol equipment or systems using IEC 60870-5 standard(s).
This part of IEC 60870-5 contains general subjects and guidelines for the test environment.
Detailed test cases, mandatory and optional mandatory test cases for the companion
standards will become available as technical specifications (IEC 60870-5-60x).
Tests according to EMC requirements or related to environmental and organisational
conditions are beyond the scope of this part of IEC 60870-5. This part of IEC 60870-5 only
focuses on the protocol implementation and the related system functionality necessary to
validate the protocol implementation.

– 6 – IEC 60870-5-6:2006  IEC 2006
TELECONTROL EQUIPMENT AND SYSTEMS –

Part 5-6: Guidelines for conformance testing for
the IEC 60870-5 companion standards

1 Scope
This part of the IEC 60870-5 series specifies methods for conformance testing of telecontrol
equipment, amongst Substation Automation Systems (SAS) and telecontrol systems, including
front-end functions of SCADA.
The use of this part of IEC 60870-5 facilitates interoperability by providing a standard method
of testing protocol implementations, but it does not guarantee interoperability of devices. It is
expected that using this part of IEC 60870-5 during testing will minimize the risk of non-
interoperability.
The goal of this part of IEC 60870-5 is to enable unambiguous and standardised evaluation of
IEC 60870-5 companion standard protocol implementations. The guidelines and conditions for
the testing environment are described in this part of IEC 60870-5. The detailed test cases per
companion standard, containing among others mandatory and optional mandatory test cases
per Basic Application Function, ASDU and transmission procedure, will become available as
technical specifications (IEC 60870-5-60x). Other functionalities may need test cases, but this
is beyond the scope of this part of IEC 60870-5.
This part of IEC 60870-5 deals mainly with communication conformance testing; therefore
other requirements, such as safety or EMC are not covered. These requirements are covered
by other standards (if applicable) and the proof of compliance for these topics should be done
according to those standards.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60870-5-1, Telecontrol equipment and systems – Part 5: Transmission protocols –
Section One: Transmission frame formats
IEC 60870-5-2, Telecontrol equipment and systems – Part 5: Transmission protocols –
Section 2: Link transmission procedures
IEC 60870-5-3, Telecontrol equipment and systems – Part 5: Transmission protocols –
Section 3: General structure of application data
IEC 60870-5-4, Telecontrol equipment and systems – Part 5: Transmission protocols –
Section 4: Definition and coding of application information elements
IEC 60870-5-5, Telecontrol equipment and systems – Part 5: Transmission protocols –
Section 5: Basic application functions
ISO/IEC 9646 (all parts), Information technology – Open Systems Interconnection –
Conformance testing methodology and framework

3 Terms and definitions
For the purposes of this part of IEC 60870-5, the following terms and definitions apply.
3.1
configuration (of a system or device)
step in system design: selecting functional units, assigning their locations and defining their
interconnections
3.2
configuration list
supplies an overview of all compatible hardware and software versions of components of
controlled/controlling stations including the software versions of relevant supporting tools
3.3
address config
address config is the configuration file containing the ASDU-addressing including the
information object addresses necessary to test all the functionality defined as in the PID
3.4
conformance test
verification process of the protocol implementation in a device by executing tests according to
the applicable test plan, which contain mandatory and possibly mandatory optional test cases,
so as to be able to answer the following question:
“Does the protocol implementation in device xxx of supplier yyy conform to the
IEC 60870-5-10x standard and the applicable Protocol Implementation Document (PID)?”
NOTE A supplier-independent party that is allowed to issue a Conformance Statement can carry out a
conformance test.
3.5
device
mechanism or piece of equipment designed to serve a purpose or perform a function
[IEEE STD 100-1996, IEEE Dictionary of Electrical and Electronic Terms]
3.6
direction
communication direction in which the device exchanges the data
NOTE IEC 60870-5 companion standards describe functions and ASDU’s in the monitor direction (from the
controlled to the controlling station) and control direction (from controlling to controlled station) as Normal direction
(N). For some purposes, the functions or ASDU’s can be used also in the Reverse direction (R) or in Both
directions (B). The way they are used should be indicated in the PICS. If reversed direction is enabled, by using R
or B, the functionality is used in the reverse direction, the applicable test cases in the normal direction are
applicable for the reversed functionality.
3.7
error
behaviour, which does not conform to the standard and/or the applicable test cases as
described in this part of IEC 60870-5
3.8
Factory Acceptance Test
FAT
customer agreed functional tests of the specifically manufactured telecontrol equipment or its
parts using the parameter set for the planned application
NOTE The FAT should be carried out in the factory of the manufacturer by the use of process simulating test
equipment.
– 8 – IEC 60870-5-6:2006  IEC 2006
3.9
function
tasks performed by the telecontrol equipment
NOTE Generally, functions will exchange data with each other.
3.10
hold point
H
point, defined in the appropriate document beyond which an activity should not proceed
without the approval of the initiator of the conformance test. If necessary, the test facility
could provide a written notice to the initiator at an agreed time prior to the hold point. The
initiator or his representative is obliged to verify the hold point and approve the proceeding of
the activity
3.11
quality program
quality program for the IEC 60870-5 series as described in Figure 3
3.12
initiator of conformance test
party initiating a conformance test that may be executed by a test facility
3.13
interface
shared boundary between two functional units, defined by functional characteristics, signal
characteristics, or other characteristics as appropriate
3.14
interoperability
ability of two or more telecontrol devices from the same vendor, or different vendors, to
exchange information and use that information for correct co-operation
3.15
interoperability test
verification of the information exchange of two or more devices from the same vendor or
different vendors.
In case of an open protocol, the test shall give an answer to the following question:
“Are the devices under test (DUT) able to communicate correctly according to the
IEC 60870-5-10x standard and the Protocol Implementation Document (PID)?”
The interoperability test can be carried by a supplier-independent party that may result in an
interoperability statement. A basic condition for this interoperability test is a passed
conformance test of both devices
NOTE Interoperability does not necessarily mean that both systems are communicating according a specific
protocol, but that both those devices are able to communicate and this might be an open protocol. Interoperability
is not interchangability.
3.16
interchangability
ability to replace a device from the same vendor, or from different vendors, using the same
communication interface and as a minimum, with the same functionality, and with no impact
on the rest of the system
3.17
mandatory optional test case
test case initially marked as optional in the column “required”, indicated by “PICS, ….” or
“PIXIT” which becomes a mandatory test case if this functionality is enabled and/or described
in the PICS or the PIXIT. This optional test case then becomes a mandatory test case
3.18
negative test
test to verify the correct response of a device or a system on:
– IEC 60870-5 series conformant information and services, which are not implemented;
– non conformant communication traffic
3.19
open protocol
communication protocol of which the protocol specification is freely accessible for all market
parties, for example an IEC protocol communication standard
3.20
Physical Connection
PC
communication link between physical devices
3.21
Physical Device
PD
independent physical entity capable of performing one or more specified device functions in a
particular context and delimited by its interfaces. A physical device is equivalent to or is part
of a controlling or controlled station
3.22
plausibility test
a plausibility test is passed if the corresponding time, value, status or other items have been
shown to have the correct value (no tolerance) for time-stamp, values, status and for the other
items regarding the requirements in 5.6.3
NOTE Applicable tolerances may be part of the PIXIT.
3.23
Protocol Implementation eXtra Information for Testing
PIXIT
the PIXIT document contains system specific information regarding the capabilities of the
system to be tested and specifies which items are optional, in the applicable Companion
Standard or outside the scope of the 60870-5 series. The PIXIT is not subject to
standardisation, but 5.5.1.4 describes guidelines and recommendations for setting up a PIXIT
NOTE It is recommended is to integrate the PIXIT and the PICS into one document, which is the PID.
3.24
positive test
test to ensure the correct implementation of the system capabilities as defined by the
supplier. A positive test has a described and defined response
3.25
Protocol Implementation Conformance Statement
PICS
summary of the capabilities of the system to be tested. Every companion standard contains a
PICS. The use of the interoperability sheets of the particular standard for the definition of the
PICS is mandatory
NOTE It is recommended to integrate PIXIT and PICS into one document, which is the PID.

– 10 – IEC 60870-5-6:2006  IEC 2006
3.26
Protocol Implementation Document
PID
describes the way a specific area (country, company, functionality) uses and implements the
protocol. The PID consists of the PICS and the PIXIT. The PID shall not be subject to
standardisation and is system specific. The PID always contains the PICS and is mandatory
for conformance testing
NOTE It is recommended to integrate the PIXIT and the PICS into one document, which is the PID.
3.27
Remote Terminal Unit
RTU
acts as an interface between the communication network and the substation equipment
NOTE An RTU is typically an outstation.
3.28
review
R
optional systematic examination, defined in the appropriate document, of the quality
document(s) for an activity
NOTE The test facility can provide the documentation to be reviewed to the initiator of the conformance test at an
agreed time prior to the associated hold or witness point. It is subject to agreement how the review will be
conducted.
3.29
system
set of interrelated elements considered in a defined context as a whole and separated from its
environment
3.30
logical system
union of all communicating functions performing some overall tasks such as “management of
a substation”
3.31
physical system
composition of all devices and the interconnecting physical communication network
NOTE The boundary of a system is given by its logical or physical interfaces. Within the scope of IEC 60870-5,
system always refers to Telecontrol equipment and systems, if not mentioned otherwise.
3.32
system test
check of correct behaviour of the controlled/controlling station under various application
conditions
NOTE The system test marks the final stage of the development of a Telecontrol equipment or system.
3.33
test equipment
all tools and instruments, which simulate and verify the communication traffic, input or outputs
of the system under test
3.34
test facility
supplier-independent organisations, which are able to provide appropriate test equipment and
trained staff for conformance testing
NOTE The management of conformance tests and the resulting information should follow a quality system
according to ISO 9001/ISO 9002 as far as applicable.
Test facilities should comply with the requirements as described in this part of IEC 60870-5.

3.35
test item
one single test step out of the sequence of tests defined to verify conformance
3.36
type test
verification of correct behaviour of the DUT by use of the system tested software under the
environmental test conditions corresponding with the technical data
NOTE The type test marks the final stage of the hardware development and is the precondition for the start of the
production. This test should be carried out with IED's, which have been manufactured through the normal
production cycle.
3.37
witness point
W
point, defined in the appropriate document, at which an inspection should take place on an
activity. The activity may proceed without the approval of the initiator of the conformance test.
The test facility can provide a written notice to the initiator at an agreed time prior to the
witness point. The initiator or his representative has the right, but is not obliged, to verify the
witness point
3.38
receiving system
system that receives the message, either on physical, link or application layer level, and can
be a controlling (Master) station or a controlled (Slave) station
4 Abbreviations
ASDU Application Service Data Unit
BAF Basic Application Function
CASDU Common Address of ASDU
COT Cause Of Transmission
DUT Device Under Test
FAT Factory Acceptance Test
HMI Human Machine Interface
IED Intelligent Electronic Device
IOA Information Object Address
IP Inter-Networking Protocol
MTTF Mean Time To Failure
PICS Protocol Implementation Conformance Statement
PID Protocol Implementation Document (=PICS + PIXIT)
PIXIT Protocol Implementation eXtra Information for Testing
RTU Remote Terminal Unit
SAT Site Acceptance Test
SCADA Supervisory Control And Data Acquisition
SUT System Under Test
TCP Transport Control Protocol
TE Telecommunication Environment

– 12 – IEC 60870-5-6:2006  IEC 2006
5 Conformance testing
5.1 General
There are many steps involved from the development and production of a device to the proper
running of a complete system designed according the specific needs of a customer. Suitable
test steps are incorporated in this process.
The quality system of the producer/supplier forms the basis of reliable testing in development
and production activities.
Many internal tests during the development of a device (or a system kit) result in a type test
(unit level test) performed at least by the provider and – if required by applicable standards –
by an independent test authority. In the context of this document, the term type test is
restricted to the functional behaviour of the device.
Continuing routine tests in the production chain are necessary to ensure a constant quality of
delivered devices in accordance with the quality procedures of the producer.
A conformance test is the type test for communication and – since communication establishes
a system – the system related test of the incorporated IED’s. As a global communications
standard, the IEC 60870-5 series includes standardised conformance tests to ensure that all
suppliers comply with applicable requirements.
Type tests and conformance test do not completely guarantee that all functional and
performance requirements are met. However, when properly performed, such tests
significantly reduce the risk of costly problems occurring during system integration in the
factory and on-site.
Conformance testing does not replace project-specific system related tests such as the FAT
and SAT. The FAT and SAT are based on specific customer requirements for a dedicated
substation automation system and are done by the system integrator and normally witnessed
by the customer. These tests increase the confidence level that all potential problems in the
system have been identified and solved. These tests establish that the delivered substation
automation system is performing as specified.
5.2 Conformance test procedures
In general, conformance testing of the communication behaviour of devices shall address the
functional requirements and performance requirements of typical applications supported by
these devices in a system.
Conformance testing demonstrates the capability of the DUT to operate with other devices in
a specified way according to the PID. The conformance test shall prove that the
communication of the DUT works according to the PID.
The role of institutions and test bodies for conformance testing and certifying the results is
described in this Subclause.
For conformance testing, the following points shall be considered:
– The problem of any testing is the completeness of the tests. The number of all possible
situations could be very large. This part of IEC 60870-5 and the technical specifications
(IEC 60870-5-60x) takes into consideration the normal operating cases, but not the failure
cases. Only some failure cases are defined and it is recommended to add failure test
cases in case of a critical function.

– A communication standard does not standardise the functions of the communicating
equipment, including failure modes of the functions. But both the existence of distributed
functions and the impact of function response in devices on the data flow create some
interdependence.
– Depending on the definition range of the standard, some properties of the device may be
proven not by the conformance test itself, but by information and documents to be
provided with the DUT for the conformance testing.
For every companion standard, the PICS form the basis for the tests. As input, PICS defines
the supported functions of a device. The output is the test plan for the applicable companion
standard that contains the PICS and the marked check boxes (with N, R or B) that indicates
that the applicable mandatory test cases are validated and approved by a test facility.
Optional or additional test cases can be part of the test plan but will be marked separately,
including their reference to the PIXIT. If test cases are applicable as indicated in the PICS
and/or PIXIT, these test cases are mandatory optional test cases.
The test plan for each companion standard is the same for the controlling and/or controlled
station. The check box at the beginning of the PICS indicates whether a controlling or
controlled station is tested and approved.
5.3 Quality assurance and testing
In order to assure the quality during conformance testing, a quality assurance system shall be
in place. This shall be clearly demonstrated by the test facility. This applies also to the quality
systems of all sub-suppliers.
In general, quality surveillance is used to monitor and verify the status of components during
all phases of the conformance tests. For this purpose, inspections can be carried out, based
on hold and witness points that are indicated by the purchaser or its representative in the test
and inspection book that is supplied by the test facility. These inspections are process related
and will provide information on, and confidence in the quality of the tests. It will reduce the
risks of failure during the Factory Acceptance Test (FAT) and Site Acceptance Test (SAT).
5.4 Quality plan
5.4.1 Conformance test quality plan
The test facility can supply, for evaluation, a quality plan for the conformance test.
This plan describes all measures for the scope of work and/or deliveries in the areas of
budget, organisation, time, information and quality. There is only one plan for the test facility
and its sub-suppliers.
The conformance test quality plan shall also contain the following:
– The complete and detailed description of the work methods which guarantees that all
verifiable activities will fulfil all applicable requirements and conditions as stated in the
scope of work during the total lead time.
– A detailed description of all tasks to be performed, including references to the schedule,
an overview of the involved staff, materials and work methods as well as relevant methods
and procedures.
– A detailed description of the organisation, including the assignments, tasks and
responsibilities of mentioned staff for all tests, inspections, research and audits during the
various stages of the tests and the dates at which they will take place. These programs
will be part of the test and inspection book.
– A method for handling deviations, changes and modifications during all stages of the test.
– A sign off procedure and a description of the documentation to be supplied.

– 14 – IEC 60870-5-6:2006  IEC 2006
5.4.2 Test and inspection plan
The conformance test quality plan shall contain a test and optionally, an inspection plan. In
this plan, the test facility specifies, for all phases of the tests:
– what will be inspected, tested and registered;
– the purpose of the inspections and tests;
– the procedures and standards to which inspections, tests and registrations will be
performed;
– the expected results of the inspections and tests;
– who will perform the inspections, tests and registrations.
The test facility is responsible for performing all activities mentioned in the test and inspection
plan.
The test facility may, optionally, include a proposal for so-called hold, witness and review
points in the test and inspection plan.
There are several methods to perform a hold or witness point. The initiator of the conform-
ance test or his representative can be present during the execution of a test or inspection. It
is, however, also possible to review the associated quality documents, for example checklists,
verification and validation documents. This review can take place at the test facility’s site
during the execution of a test or inspection or at the initiator’s site.
All hold and witness points shall be announced by the test facility at least at a predefined time
before they take place. A period of at least one week is recommended, depending on the time
needed for making travel arrangements and the availability of the needed resources.
The initiator of a conformance test has the right to conduct audits on the quality system of the
test facility and its sub-suppliers. The test facility shall co-operate and provide access to all
locations applicable for the conformance test. The initiator’s right to check the quality of the
conformance test does not dismiss the test facility from its responsibilities.
Inspections and tests by the initiator of a conformance test shall be possible at mutually
agreed times at the locations, offices and factories of the test facility and all applicable third
parties and sub-suppliers.
5.5 Testing
5.5.1 General
5.5.1.1 Starting conditions
Conformance testing shall be customised for each DUT based on the capabilities identified in
the PID provided by the vendor. When submitting devices for testing, the following shall be
provided:
a) device ready for testing;
b) protocol Implementation Document (PID);
c) instruction manuals detailing the installation and operation of the device or assistance for
operating the DUT during the test.

5.5.1.2 General requirements
The requirements for conformance testing fall into two categories:
1) static conformance requirements (defines the requirements the implementation shall fulfil);
2) dynamic conformance requirements (defines the requirements that arise from the protocol
used for a certain implementation).
Additionally for each of these categories one of the following shall be indicated:
a) mandatory;
b) conditional;
c) optional.
The static conformance requirements define the requirements the protocol implementation
shall fulfil, while the dynamic conformance requirements define the requirements that arise
from the protocol used in a specific system with a specific functionality.
It is required to define a Protocol Implementation Document (PID), which contains the
Protocol Implementation Conformance Statement (PICS) and the Protocol Implementation
eXtra Information for Testing (PIXIT) document. The PID describes how the protocol is used
and always contains the interoperability section of the applicable companion standard.
The outcome from the testing of a device for a particular PID shall be either “conforms” (no
discrepancies) or “fails to conform” with a list of discrepancies. The test outcomes for devices
tested to the same PID shall indicate if the devices are able to interoperate. The format of
the test report is specified in this part of IEC 60870-5. It is required to use this part of
IEC 60870-5 and the technical specifications (this part) as the basis for testing the protocol
implementation, and if additional test cases are required (based on the PID), these shall be
added to the specific requirements in the PIXIT before the Factory Acceptance Test (FAT). It
is recommended to execute the conformance test before the FAT.
5.5.1.3 PICS
The static conformance requirements are defined in a PICS. The PICS serves four purposes:
– The selection of the appropriate set of tests for the device or system.
– To ensure that the tests appropriate to a claim of conformance are performed.
– To provide the basis for the review of the static conformance.
– To determine the mandatory test cases for the required functionality as stated in the PICS.
Test cases are mandatory if the test cases refer to the basic application function, ASDU or
functionality in the PICS, ticked as applicable. For example, if ASDU 100 is used, this
means that all the options in this ASDU are mandatory unless restricted in the PIXIT.
A standard PICS, also known as the PICS proforma, is supplied in the applicable companion
standard.
In addition to the PICS, a PIXIT document should be provided.
5.5.1.4 PIXIT
In addition to the PICS, a PIXIT document is highly recommended. The standard PICS is
supplied in the test plan for each companion standard and is the basis for the PID.
The PIXIT contain information directly related to the protocol implementation, but which is
system/company/country specific and therefore not part of one of the Companion Standards
or optional. The PIXIT is necessary to clarify the grey area between the protocol
implementation and telecontrol system functionality. The PIXIT focuses on static and dynamic
conformance requirements and may contain, but is not restricted to, the following aspects:

– 16 – IEC 60870-5-6:2006  IEC 2006
redundancy, performance requirements, configuration overview, command execution require-
ments, message priority mechanisms, etc. The additional test cases for the functionality in the
PIXIT are created, preferably by a test facility, and shall be approved by the user/owner of the
PIXIT before starting the testing process. The map of IOA is a mandatory part of the PIXIT.
5.5.1.5 Conceptual conformance assessment process
The process of assessing the conformance is shown in Figure 1.
Start
Static
conformance
requirements
PICS Static
conformance
Dynamic
review
conformance
requirements
Conformance
Selection and
test suite
parameterisation
PIXIT
according PID
Dynamic tests
_________________________
Basic interconnection testing
Capability testing
Behaviour testing
Analysis of results
Final conformance review
Synthesis and conclusion
Test report production
Conformance statement
Control flow
End
Data flow
IEC
Figure 1 – Conceptual conformance assessment process
The final step to interoperability, with regard to conformance testing, is the verification of the
interoperability of the DUT with other devices. Interoperability testing is beyond the scope of
this part of IEC 60870-5, but recommended before the DUT goes into operation.

5.5.2 Device testing
5.5.2.1 General
A single device shall be conformance tested against a single test source by using a
conformance test system or simulator, preferably executed by a test facility.
The PID is mandatory for conformance testing and does always include the PICS. The PIXIT
is optional, but highly recommended. The device specific conforman
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