BS EN 61158-5-4:2014

$215.11

Industrial communication networks. Fieldbus specifications – Application layer service definition. Type 4 elements

Published By	Publication Date	Number of Pages
BSI	2014	76

Guaranteed Safe Checkout

Category: BSI

If you have any questions, feel free to reach out to our online customer service team by clicking on the bottom right corner. We’re here to assist you 24/7.
Email:[email protected]

Description

1.1 General

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 4 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 Type 4 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 Type 4 fieldbus application layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) 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 IEC 61158-6 series.

This specification may be used as the basis for formal application programming interfaces. Nevertheless, it is not a formal programming interface, and any such interface will need to address implementation issues not covered by this specification, including

the sizes and octet ordering of various multi-octet service parameters, and
the correlation of paired request and confirm, or indication and response, primitives.

1.3 Conformance

This standard does not specify individual implementations or products, nor does it 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 the Type 2 application layer services as defined in this standard.

PDF Catalog

PDF Pages	PDF Title
7	English CONTENTS
9	INTRODUCTION
10	1 Scope 1.1 General
11	1.2 Specifications 1.3 Conformance 2 Normative references
12	3 Terms and definitions 3.1 ISO/IEC 7498-1 terms 3.2 ISO/IEC 8822 terms 3.3 ISO/IEC 9545 terms
13	3.4 ISO/IEC 8824-1 terms 3.5 Fieldbus data-link layer terms 3.6 Fieldbus application layer specific definitions
19	3.7 Abbreviations and symbols
20	3.8 Conventions
23	4 Concepts 4.1 Overview
24	4.2 Architectural relationships Figures Figure 1 – Relationship to the OSI basic reference model
25	Figure 2 – Architectural positioning of the fieldbus Application Layer
26	4.3 Fieldbus Application Layer structure
27	Figure 3 – Client/server interactions
28	Figure 4 – Pull model interactions
29	Figure 5 – Push model interactions
30	Figure 6 – APOs services conveyed by the FAL
32	Figure 7 – Application entity structure
33	Figure 8 – Example FAL ASEs
34	Figure 9 – FAL management of objects
35	Figure 10 – ASE service conveyance
37	Figure 11 – Defined and established AREPs
38	4.4 Fieldbus Application Layer naming and addressing 4.5 Architecture summary
39	4.6 FAL service procedures Figure 12 – FAL architectural components
40	4.7 Common FAL attributes 4.8 Common FAL service parameters
41	4.9 APDU size 5 Type 4 communication model specification 5.1 Concepts
42	Figure 13 – FAL AE
45	Figure 14 – Summary of the FAL architecture
46	Figure 15 – FAL service procedure overview
47	Figure 16 – Time sequence diagram for the confirmed services
48	5.2 Variable ASE Figure 17 – Time sequence diagram for unconfirmed services
63	Tables Table 1 – REQUEST service parameters
64	Table 2 – RESPONSE service parameters
65	Table 3 – Error codes by source Table 4 – Reserve REP service parameters
66	Table 5 – Free AREP service parameters Table 6 – Get REP attribute service parameters
67	5.3 Application relationship ASE Table 7 – Set REP attribute service parameters
71	Table 8 – AR send service parameters Table 9 – AR acknowledge service parameters
72	Table 10 – AR get attributes service parameters Table 11 – AR set attributes service parameters
74	Bibliography

Additional information

Status	Withdrawn
Title	Industrial communication networks. Fieldbus specifications – Application layer service definition. Type 4 elements
Replaces	BS EN 61158-5-4:2008
Publisher	BSI
Committee	GEL/65/3
Pages	76
Publication Date	2014-10-31
Withdrawn Date	2022-07-29
Replaced By	BS EN IEC 61158-5-4:2019
ISBN	978 0 580 79454 4
Standard Number	BS EN 61158-5-4:2014
Identical National Standard Of	IEC 61158-5-4:2014, EN 61169-39:2011, EN 61158-5-4:2014
Descriptors	Automatic control systems, Process control, Interfaces (data processing), Computer networks, Application layer (OSI), Communication networks, Communication procedures, Open systems interconnection, Industrial, Fieldbus, Bus networks, Data transmission
ICS Codes	35.110 - Networking

Preview PDF


PDF Format	Searchable	Printable	Preview Now

BS EN 61158-5-4:2014

PDF Catalog

Related products