BS EN 61158-4-22:2012

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Industrial communication networks. Fieldbus specifications – Data-link layer protocol specification. Type 22 elements

Published By	Publication Date	Number of Pages
BSI	2012	68

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Description

1.1 General

The data-link layer provides basic time-critical messaging communications between devices in an automation environment.

This protocol provides communication opportunities to all participating data-link entities

in a synchronously-starting cyclic manner, according to a pre-established schedule, and
in a cyclic or acyclic asynchronous manner, as requested each cycle by each of those data-link entities.

Thus this protocol can be characterized as one which provides cyclic and acyclic access asynchronously but with a synchronous restart of each cycle.

1.2 Specifications

This standard specifies:

procedures for the timely transfer of data and control information from one data-link user entity to a peer user entity, and among the data-link entities forming the distributed data- link service provider;
the structure of the fieldbus DLPDUs used for the transfer of data and control information by the protocol of this standard, and their representation as physical interface data units.

1.3 Procedures

The procedures are defined in terms of:

the interactions between peer DL-entities (DLEs) through the exchange of fieldbus DLPDUs;
the interactions between a DL-service (DLS) provider and a DLS-user in the same system through the exchange of DLS primitives;
the interactions between a DLS-provider and a Ph-service provider in the same system through the exchange of Ph-service primitives.

1.4 Applicability

These procedures are applicable to instances of communication between systems which support time-critical communications services within the data-link layer of the OSI or fieldbus reference models, and which require the ability to interconnect in an open systems interconnection environment

Profiles provide a simple multi-attribute means of summarizing an implementation’s capabilities, and thus its applicability to various time-critical communications needs.

1.5 Conformance

This standard also specifies conformance requirements for systems implementing these procedures.

This part of IEC 61158 does not contain tests to demonstrate compliance with such requirements.

PDF Catalog

PDF Pages	PDF Title
6	CONTENTS
9	INTRODUCTION
11	1 Scope 1.1 General 1.2 Specifications 1.3 Procedures 1.4 Applicability
12	1.5 Conformance 2 Normative references 3 Terms, definitions, symbols, abbreviations and conventions 3.1 Reference model terms and definitions
14	3.2 Service convention terms and definitions
15	3.3 Common terms and definitions
16	3.4 Additional Type 22 definitions
19	3.5 Common symbols and abbreviations
20	3.6 Additional Type 22 symbols and abbreviations
22	3.7 Conventions Tables Table 1 – DLPDU element definition
23	4 Overview of the DL-protocol 4.1 Operating principle 4.2 Communication model Table 2 – Conventions for protocol machine description
24	4.3 Topology 4.4 DLPDU processing
25	4.5 General communication mechanisms
26	4.6 Gateway 4.7 Interaction models 5 DLPDU structure 5.1 Overview
27	5.2 Data types and encoding rules Table 3 – Transfer syntax for bit sequences
28	5.3 DLPDU identification Table 4 – Transfer syntax for data type Unsignedn Table 5 – Transfer syntax for data type Signedn
29	5.4 General DLPDU structure Table 6 – Type 22 DLPDU inside an ISO/IEC 8802-3 Table 7 – Type 22 DLPDU inside a VLAN tagged ISO/IEC 8802-3 DLPDU
30	Table 8 – Type 22 DLPDU inside an UDP DLPDU Table 9 – General structure of a Type 22 DLPDU
31	5.5 Communication management DLPDUs Table 10 – DLPDU header structure Table 11 – Network verification prepare DLPDU Table 12 – Network verification environment DLPDU Table 13 – Network verification information DLPDU
32	Table 14 – Network verification acknowledgement DLPDU Table 15 – RTFN scan network read request DLPDU Table 16 – RTFN scan network read response DLPDU Table 17 – Identification data
33	Table 18 – PhyLinkPortX Table 19 – RTF support
34	Table 20 – UseDHCP Table 21 – DeviceRole
35	Table 22 – RTFN connection management DLPDU Table 23 – CDCN connection still alive DLPDU Table 24 – ID data Table 25 – RTFL control DLPDU
36	5.6 Cyclic data channel (CDC) DLPDUs Table 26 – RTFL configuration DLPDU Table 27 – RTFL configuration acknowledgement DLPDU
37	5.7 Cyclic data channel (CDC) DLPDU data Table 28 – CDCL DLPDU Table 29 – CDCN DLPDU Table 30 – CDC DLPDU data arrangement
38	5.8 Message channel (MSC) DLPDUs Table 31 – CDC DLPDU data Table 32 – MSCL DLPDU
39	5.9 Message channel DLPDU data – MSC message transfer protocol (MSC-MTP) Table 33 – MSCL control Table 34 – MSCN DLPDU
40	Table 35 – MSC-MTP frame structure Table 36 – Address type
41	Table 37 – MSC-MTP Init structure Table 38 – MSC-MTP Init_Fast structure Table 39 – MSC-MTP Send structure
42	Table 40 – MSC-MTP Acknowledgement structure Table 41 – MSC-MTP Abort structure Table 42 – Data structure of a message
43	5.10 Time synchronization Table 43 – DelayMeasurement start encoding Table 44 – DelayMeasurement read encoding Table 45 – PCS configuration encoding Table 46 – Time synchronization service request
44	6 Telegram timing and DLPDU handling 6.1 Communication mechanism Table 47 – Time synchronization service response
45	Figures Figure 1 – DLPDU sequence
46	6.2 Device synchronization Figure 2 – Communication relationship RTFN device
47	7 Type 22 protocol machines 7.1 RTFL device protocol machines Figure 3 – Overview RTFL device protocol machines
48	Figure 4 – Protocol machine send DLPDU procedure
49	Figure 5 – Protocol machine receive DLPDU procedure
50	Figure 6 – CDCL send cyclic data sequence
51	Figure 7 – CDCL receive cyclic data sequence
52	Figure 8 – MSCL send sequence
53	Figure 9 – MSCL receive sequence
54	Figure 10 – Network management protocol machine
55	Figure 11 – Net management sequence at system boot up
56	Figure 12 – Initialization sequence ordinary device
57	Figure 13 – PCS configuration sequence
58	Figure 14 – Delay measurement principle
59	7.2 RTFN device protocol machines Figure 15 – Overview RTFN device protocol machines
60	Figure 16 – CDCN connection setup and release
61	7.3 Message channel – message transfer protocol (MSC-MTP) Figure 17 – CDCN unpulish data
62	Figure 18 – Segmentation sequence Figure 19 – Expedited transfer sequence
63	Figure 20 – Toggling from expedited transfer to segmented transfer
64	Figure 21 – Segmentation sequence for broad- or multicast message without Acknowledgement
65	Bibliography

Additional information

Status	Withdrawn
Title	Industrial communication networks. Fieldbus specifications – Data-link layer protocol specification. Type 22 elements
Publisher	BSI
Committee	GEL/65/3
Pages	68
Publication Date	2012-06-30
Withdrawn Date	2014-11-30
Replaced By	BS EN 61158-4-22:2014
ISBN	978 0 580 71551 8
Standard Number	BS EN 61158-4-22:2012
Identical National Standard Of	EN 61158-4-22:2012, IEC 61158-4-22:2010
Descriptors	Process control, Interfaces (data processing), Industrial, Automatic control systems, Bus networks, Computer networks, Fieldbus, Data transmission, Communication networks, Data link layer (OSI), Open systems interconnection, Communication procedures
ICS Codes	35.110 - Networking

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