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BS EN 61158-3-2:2014+A1:2019

BS EN 61158-3-2:2014+A1:2019

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Industrial communication networks. Fieldbus specifications – Data-link layer service definition. Type 2 elements

Published By Publication Date Number of Pages
BSI 2019 52
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1.1 General

This part of IEC 61158 provides common elements for basic time-critical messaging communications between devices in an automation environment. 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 2 fieldbus data-link layer in terms of:

  1. the primitive actions and events of the service;

  2. the parameters associated with each primitive action and event, and the form which they take; and

  3. the interrelationship between these actions and events, and their valid sequences. The purpose of this standard is to define the services provided to:

  • the Type 2 fieldbus application layer at the boundary between the application and data-link layers of the fieldbus reference model;

  • systems management at the boundary between the data-link layer and systems management of the fieldbus reference model.

Type 2 DL-service provides both a connected and a connectionless subset of those services specified in ISO/IEC 8886.

1.2 Specifications

The principal objective of this standard is to specify the characteristics of conceptual data-link layer services suitable for time-critical communications and thus supplement the OSI Basic Reference Model in guiding the development of data-link protocols for time-critical communications. A secondary objective is to provide migration paths from previously-existing industrial communications protocols.

This specification may be used as the basis for formal DL-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:

  1. the sizes and octet ordering of various multi-octet service parameters;

  2. 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 data-link entities within industrial automation systems.

There is no conformance of equipment to this data-link layer service definition standard. Instead, conformance is achieved through implementation of the corresponding data-link protocol that fulfills the Type 1 data-link layer services defined in this standard.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 Blank Page
6 Blank Page
7 CONTENTS
11 INTRODUCTION
INTRODUCTION to the Amendment
12 1 Scope
1.1 General
1.2 Specifications
1.3 Conformance
13 2 Normative references
3 Terms, definitions, symbols, abbreviations and conventions
3.1 Reference model terms and definitions
15 3.2 Service convention terms and definitions
16 3.3 Common data-link service terms and definitions
Figures
Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DLaddresses
17 3.4 Additional Type 2 data-link specific definitions
19 3.5 Common symbols and abbreviations
20 3.6 Additional Type 2 symbols and abbreviations
3.7 Common conventions
21 4 Connection-mode and connectionless-mode data-link service
4.1 Overview
22 Figure 2 – NUT structure
23 Figure 3 – Medium access during scheduled time
24 Figure 4 – Medium access during unscheduled time
25 4.2 Facilities of the data-link service
Figure 5 – Queue model for the peer and multipoint DLS, DLSAPs and their DLCEPs
26 4.3 Model of the data-link service
27 Figure 6 – Queue model of a multipoint DLS between asending DLS-user and one or more receiving DLS-users
28 4.4 Sequence of primitives
29 Figure 7 – DLS primitive time-sequence diagram
Tables
Table 1 – Summary of connection-mode and connectionless-modeprimitives and parameters
30 4.5 Connection-mode data transfer
Figure 8 – State transition diagram for sequences of DLS primitives at one DLSAP
31 Table 2 – DLconnection-mode transfer primitives and parameters
32 4.6 Connectionless-mode data transfer
Figure 9 – Sequence of primitives for a successful connection-mode transfer
Figure 10 – Sequence of primitives for an unsuccessful connection-mode transfer
33 Table 3 – DLconnectionless-mode transfer primitives and parameters
34 Table 4 – Fixed tag services available to the DLS-user
35 4.7 Queue maintenance
Figure 11 – Sequence of primitives for a successful connectionless-mode transfer
Figure 12 – Sequence of primitives for an unsuccessful connectionless-mode transfer
36 Table 5 – DLqueue maintenance primitives and parameters
37 4.8 Tag filter
Figure 13 – Sequence of primitives for a queue maintenance request
Table 6 – DLconnectionless-mode tag filter primitives and parameters
38 5 DLmanagement services
5.1 Sequence of primitives
Figure 14 – Sequence of primitives for a tag filter request
39 5.2 Link synchronization
Table 7 – Summary of DLmanagement primitives and parameters
40 5.3 Synchronized parameter change
Figure 15 – Sequence of primitives for a local link synchronization
Table 8 – Link synchronization primitives and parameters
41 Table 9 – Synchronized parameter change primitives and parameters
Table 10 – DLMS-configuration-data
42 5.4 Event reports
Figure 16 – Sequence of primitives for a DLM-get/set parameters request
Figure 17 – Sequence of primitives for a DLM-tMinus change request
43 Table 11 – Event report primitives and parameters
Table 12 – DLMS events being reported
44 5.5 Bad FCS
5.6 Current moderator
Figure 18 – Sequence of primitives for a DLM-event indication
Figure 19 – Sequence of primitives for a DLM-bad-FCS indication
Table 13 – Bad FCS primitives and parameters
45 5.7 Enable moderator
Figure 20 – Sequence of primitives for a DLM-current-moderator indication
Table 14 – Current moderator primitives and parameters
Table 15 – Enable moderator primitives and parameters
46 5.8 Power-up and online
Figure 21 – Sequence of primitives for a DLM-enable-moderator request
Table 16 – Power-up and online primitives and parameters
47 5.9 Listen only
Figure 22 – Sequence of primitives for a DLMpower-up indication
Figure 23 – Sequence of primitives for a DLMonline request
Figure 24 – Sequence of primitives for a DLM-listen-only request
Table 17 – Listen-only primitives and parameters
48 5.10 Time distribution
Table 18 – DLMS time and time quality parameters
49 Table 19 – Time distribution source quality
50 Bibliography

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BS EN 61158-3-2:2014+A1:2019
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