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IEC/PAS 61158-4-22

Industrial communication networks – Fieldbus specifications – Part 4–22: Data-link layer protocol specification – Type SNpTYPE elements

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Organization: IEC
Publication Date: 1 August 2009
Status: inactive
Page Count: 70
ICS Code (Industrial automation systems): 25.040
ICS Code (Data link layer): 35.100.20
scope:

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.

Specifications

This part of IEC 61158-4 specifies:

a) 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 datalink service provider;

b) the structure of the fieldbus DLPDUs used for the transfer of data and control information by the protocol of this part of IEC 61158-4, and their representation as physical interface data units.

Procedures

The procedures are defined in terms of:

a) the interactions between peer DL-entities (DLEs) through the exchange of fieldbus DLPDUs;

b) the interactions between a DL-service (DLS) provider and a DLS-user in the same system through the exchange of DLS primitives;

c) the interactions between a DLS-provider and a Ph-service provider in the same system through the exchange of Ph-service primitives.

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.

Conformance

This part of IEC 61158-4 also specifies conformance requirements for systems implementing these procedures.

This part of IEC 61158-4 does not contain tests to demonstrate compliance with such requirements.

Document History

August 1, 2014
Industrial communication networks – Fieldbus specifications – Part 4-22: Data-link layer protocol specification – Type 22 elements
General The data-link layer provides basic time-critical messaging communications between devices in an automation environment. This protocol provides communication opportunities to all...
August 1, 2010
Industrial communication networks – Fieldbus specifications – Part 4-22: Data-link layer protocol specification – Type 22 elements
General The data-link layer provides basic time-critical messaging communications between devices in an automation environment. This protocol provides communication opportunities to all...
IEC/PAS 61158-4-22
August 1, 2009
Industrial communication networks – Fieldbus specifications – Part 4–22: Data-link layer protocol specification – Type SNpTYPE elements
General The data-link layer provides basic time-critical messaging communications between devices in an automation environment. This protocol provides communication opportunities to all...

References

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