BS EN 61158-6-19:2012

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Industrial communication networks. Fieldbus specifications – Application layer protocol specification. Type 19 elements

Published By	Publication Date	Number of Pages
BSI	2012	28

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Description

The Fieldbus Application Layer (FAL) provides user programs with a means to access the fieldbus communication environment. In this respect, the FAL can be viewed as a “window between corresponding application programs.”

This standard 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 19 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 standard defines in an abstract way the externally visible service provided by the different Types of fieldbus Application Layer in terms of

an abstract model for defining application resources (objects) capable of being manipulated by users via the use of the FAL service,
the primitive actions and events of the service;
the parameters associated with each primitive action and event, and the form which they take; and
the interrelationship between these actions and events, and their valid sequences.

The purpose of this standard is to define the services provided to

the FAL user at the boundary between the user and the Application Layer of the Fieldbus Reference Model, and
Systems Management at the boundary between the Application Layer and Systems Management of the Fieldbus Reference Model.

This standard specifies the structure and services of the IEC fieldbus Application Layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498) and the OSI Application Layer Structure (ISO/IEC 9545).

FAL services and protocols are provided by FAL application-entities (AE) contained within the application processes. The FAL AE is composed of a set of object-oriented Application Service Elements (ASEs) and a Layer Management Entity (LME) that manages the AE. The ASEs provide communication services that operate on a set of related application process object (APO) classes. One of the FAL ASEs is a management ASE that provides a common set of services for the management of the instances of FAL classes.

Although these services specify, from the perspective of applications, how request and responses are issued and delivered, they do not include a specification of what the requesting and responding applications are to do with them. That is, the behavioral aspects of the applications are not specified; only a definition of what requests and responses they can send/receive is specified. This permits greater flexibility to the FAL users in standardizing such object behavior. In addition to these services, some supporting services are also defined in this standard to provide access to the FAL to control certain aspects of its operation.

1.2 Specifications

The principal objective of this standard is to specify the characteristics of conceptual application layer services suitable for time-critical communications, and thus supplement the OSI Basic Reference Model in guiding the development of application layer protocols for time- critical communications.

A secondary objective is to provide migration paths from previously-existing industrial communications protocols. It is this latter objective which gives rise to the diversity of services standardized as the various Types of IEC 61158, and the corresponding protocols standardized in subparts of IEC 61158-6

1.3 Conformance

This standard do not specify individual implementations or products, nor do they constrain the implementations of application layer entities within industrial automation systems.

There is no conformance of equipment to this application layer service definition standard. Instead, conformance is achieved through implementation of conforming application layer protocols that fulfill any given Type of application layer services as defined in this standard.

PDF Catalog

PDF Pages	PDF Title
6	CONTENTS
8	INTRODUCTION
9	1 Scope 1.1 General
10	1.2 Specifications 1.3 Conformance 2 Normative references
11	3 Terms, definitions, abbreviations, symbols and conventions 3.1 Referenced terms and definitions
12	3.2 Additional terms and definitions
13	3.3 Additional abbreviations and symbols 3.4 Conventions
14	4 Abstract syntax 5 Transfer syntax 5.1 Introduction 5.2 RTC PDU merged abstract and transfer syntax 6 Structure of FAL protocol state machines Tables Table 1 – RTC PDU attribute format
15	Figures Figure 1 – Relationships among protocol machines and adjacent layers
16	7 AP-context state machine 7.1 Overview 7.2 States 7.3 States, events and transitions Figure 2 – APCSM state diagram
17	8 FAL service protocol machine (FSPM) 8.1 Overview 8.2 MGT services Table 2 – APCSM state-event table
18	8.3 IDN services 8.4 CYCIDN services 9 Application relationship protocol machine (ARPM) 9.1 Overview
19	9.2 Master ARPM Figure 3 – ARPM master AR state diagram
20	9.3 Slave ARPM Figure 4 – ARPM slave AR state diagram Table 3 – Master ARPM state-event table
21	9.4 Primitives received from the FSPM Table 4 – Slave ARPM state-event table
22	9.5 Indications received from the DMPM
23	10 DLL mapping protocol machine (DMPM) 10.1 Overview 10.2 Primitives received from the ARPM
24	10.3 Indications received from the DL Table 5 – ARPM to DL mapping Table 6 – DL to ARPM mapping
25	Bibliography

Additional information

Status	Withdrawn
Title	Industrial communication networks. Fieldbus specifications – Application layer protocol specification. Type 19 elements
Replaces	BS EN 61158-6-19:2008
Publisher	BSI
Committee	GEL/65/3
Pages	28
Publication Date	2012-07-31
Withdrawn Date	2014-11-30
Replaced By	BS EN 61158-6-19:2014
ISBN	978 0 580 71570 9
Standard Number	BS EN 61158-6-19:2012
Identical National Standard Of	IEC 61158-6-19:2010, EN 61158-6-19:2012
Descriptors	Fieldbus, Communication procedures, Interfaces (data processing), Communication networks, Computer networks, Data transmission, Process control, Bus networks, Industrial, Automatic control systems, Open systems interconnection, Application layer (OSI)
ICS Codes	35.110 - Networking

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