IEC PAS 61499-2:2001

IEC/PAS 61499-2
Edition 1.0
2001-05
PRE-STANDARD
Function blocks for industrial-process
measurement and control systems –
Part 2:
Software tools requirements
PUBLI C LY AVAI LABLE SPECI F I CATI O N
IN TER N A TION AL Reference number
E L E C T R OT E CHNI CA L
IEC/PAS 61499-2
C O MMI S S I O N
IEC/PAS 61499-2
Edition 1.0
2001-05
PRE-STANDARD
Function blocks for industrial-process
measurement and control systems –
Part 2:
Software tools requirements
PUBLI C LY AVAI LABLE SPECI F I CATI O N
IN TER N A TION AL Reference number
E L E C T R OT E CHNI CA L
IEC/PAS 61499-2
C O MMI S S I O N
– 2 – Copyright © IEC, 2001
TABLE OF CONTENTS
1. GENERAL REQUIREMENTS .4

1.1 Scope.4

1.2 Normative references .4

1.3 Definitions.5

2. SOFTWARE TOOL REQUIREMENTS .5

2.1 Information to be provided by the software tool supplier.5

2.2 Exchange of library elements .5
2.3 Information to be provided by the supplier of library elements .5
2.4 Display of declarations .6

2.5 Modification of declarations.6

2.6 Validation of declarations .6
2.7 Implementation of declarations .6
2.8 System operation, testing and maintenance .6
ANNEX A - DOCUMENT TYPE DEFINITIONS (DTDs) (normative) .7
A.1 DataType.8
A.2 LibraryElement.13
A.3 Examples .22
A.3.1 Basic function block types.22
A.3.2 Service interface function block types.26
A.3.3 An adapter interface type.29
A.3.4 Resource types .30
A.3.5 Device types.32
A.3.6  A system configuration.33
ANNEX B - GRAPHICS MODEL (informative).37
B.1 Coordinate system .37
B.2 Location of graphical elements .38
B.3 Routing of connections.38
B.4 Default layouts .38

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LIST OF TABLES
Table A.0 - Document Type Definitions (DTDs).7

Table A.1-1 - DataType DTD.8

Table A.1-2 - DataType DTD Elements.9

Table A.2-1 - Library Element DTD .13

Table A.2-2 - LibraryElement DTD Elements.17

Copyright © IEC, 2001
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
FUNCTION BLOCKS FOR INDUSTRIAL-PROCESS MEASUREMENT

AND CONTROL SYSTEMS
PART 2: SOFTWARE TOOLS REQUIREMENTS

FOREWORD
A PAS is a technical specification not fulfilling the requirements for a standard, but made available to

the public and established in an organization operating under given procedures.

IEC-PAS 61499-2 has been processed by working group 6 of IEC technical committee 65: Industrial-process
measurement and control.
The text of this PAS is based on the This PAS was approved for
following document: publication by the P-members of the
committee concerned as indicated in
the following document:
Draft PAS Report on voting
65/260/PAS 65/265/RVD
Following publication of this PAS, the technical committee or subcommittee concerned will investigate
the possibility of transforming the PAS into an International Standard.
This is Part 2 of a projected three-part Standard under development by Working Group 6 of IEC
Technical Committee 65.
The projected parts of the standard are:
• Part 1 – Architecture,
• Part 2 – Software Tool Requirements,
• Part 3 – Application Guidelines
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the 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 interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this PAS may be the subject of patent rights.
The IEC shall not be held responsible for identifying any or all such patent rights.
Page i
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1. GENERAL REQUIREMENTS
1.1 Scope
This Standard consists of two Parts:

• Part 1, "Architecture", contains:
- general requirements, including an introduction, scope, normative references, definitions, and
reference models;
- rules for the declaration of function block types, and rules for the behavior of instances of the

types so declared;
- rules for the use of function blocks in the configuration of distributed industrial-process

measurement and control systems (IPMCSs);

- rules for the use of function blocks in meeting the communication requirements of distributed
IPMCSs;
- rules for the use of function blocks in the management of applications, resources and devices in
distributed IPMCSs;
- requirements to be met by compliant systems and standards.
• This Part defines requirements for software tools to support the following systems
engineering tasks enumerated in subclause 1.1 of IEC 61499-1:
- the specification of function block types;
- the functional specification of resource types and device types ;
- the specification, analysis, and validation of distributed IPMCSs;
- the configuration, implementation, operation, and maintenance of distributed IPMCSs;
- the exchange of information among software tools.
It is assumed that such software tools may be used in the context of an Engineering Support
System (ESS) as described in Annex C.1 of IEC 61499-1.
• Part 3, “Application Guidelines,” contains examples of the application of software tools in
various stages of engineering methodologies for the performance of the tasks
enumerated above.
It is beyond the scope of this Standard to specify the entire life cycle of industrial-process
IPMCSs, or the entire set of tasks and activities required to support an IPCMS over its life
cycle. However, other standards which do specify such tasks and activities may extend or
modify the requirements specified in this Part.
1.2 Normative references
The normative references given in IEC 61499-1 also apply to this Part. In addition, the
following document contains normative provisions that are used in an informative manner in

Annex A of this Part:
17B/1022/CD, Draft IEC 61915: Low-voltage switchgear and controlgear - Profiles for networked
industrial devices, 12 October 1999
All normative documents are subject to revision, and parties to agreements based on this
standard are encouraged to investigate the possibility of applying the most recent editions of
the normative documents indicated above. Members of the IEC and ISO maintain registers
of currently valid International Standards.

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1.3 Definitions
The definitions given in IEC 61499-1 also apply to this Part. In addition, the following

definitions apply for the purposes of this Part.

1.3.1. library element: The collection of declarations applying to a data type, function block type,

adapter type, subapplication type, resource type, device type, or system configuration.

2. SOFTWARE TOOL REQUIREMENTS
This Clause defines the functional requirements of software tools which support the

performance of the systems engineering tasks enumerated in subclause 1.1.

2.1 Information to be provided by the software tool supplier
The supplier of a software tool shall specify the following information in addition to other
information which may be required in this Clause:
1. The type or types of library element to which the software tool applies.
2. The engineering task or tasks supported by the software tool. Task descriptions may be taken
from the enumeration of engineering tasks given in subclause 1.1, or may be defined by the
supplier.
2.2 Exchange of library elements
A software tool shall be capable of exchanging its library elements with other software tools.
This exchange shall take the form of data in the format defined in Annex A, written on
physical media or exchanged over communication links or networks
2.3 Information to be provided by the supplier of library elements
NOTE The provisions of this subclause are intended to provide the means by which the provider of a library
element may achieve protection of intellectual property while still providing sufficient information to permit
the effective use of the library element.
The provider of a library element may elect to provide an implementation of the library element.
EXAMPLE 1) The provider of a function block type library element may provide an implementation of
the function block type as:
- one or more instances of the function block type in a resource contained in a device of
Class 0 or higher as specified in IEC 61499-1-5.1;
- an instantiable implementation of the function block type in a resource contained in a
device of Class 1 or higher as specified in IEC 61499-1-5.1;
- a file in an implementation-dependent format suitable for installation in a resource
contained in a device of Class 2 as specified in IEC 61499-1-5.1, for instance using

the IEC61499-FBMGT syntax defined in IEC 61499-1-F.3.1.2.
When an implementation of a library element is provided, the provider is not required to
provide full details of the implementation. However, the provider shall provide sufficient
information to enable the user to fully determine the functionality of the provided library
element.
EXAMPLE 2) The requirement of the above paragraph would be met by the provider of an instance of
a function block type in a resource through the provision, at a minimum, of the following
information:
- a function block type library element specifying its event and data interfaces as
defined in IEC 61499-1-2.2.1, and its services as defined in IEC 61499-1-3.1.2;
- resource type and device type library elements showing the occurrence and
connections of the function block instances.

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