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CEI - EN 61158-4-2

Industrial communication networks - Fieldbus specifications Part 4-2: Data-link layer protocol specification - Type 2 elements

active, Most Current
Organization: CEI
Publication Date: 1 February 2016
Status: active
Page Count: 346
ICS Code (Networking): 35.110
ICS Code (Data link layer): 35.100.20
ICS Code (Industrial process measurement and control): 25.040.40
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, sequentially and in a cyclic synchronous manner. Foreground scheduled access is available for time-critical activities together with background unscheduled access for less critical activities.

Deterministic and synchronized transfers can be provided at cyclic intervals up to 1 ms and device separations of 25 km. This performance is adjustable dynamically and on-line by reconfiguring the parameters of the local link whilst normal operation continues. By similar means, DL connections and new devices may be added or removed during normal operation.

This protocol provides means to maintain clock synchronization across an extended link with a precision better than 10 μs.

This protocol optimizes each access opportunity by concatenating multiple DLSDUs and associated DLPCI into a single DLPDU, thereby improving data transfer efficiency for datalink entities that actively source multiple streams of data.

The maximum system size is an unlimited number of links of 99 nodes, each with 255 DLSAPaddresses. Each link has a maximum of 224 related peer and publisher DLCEPs.

Specifications

This standard 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 standard, 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 standard also specifies conformance requirements for systems implementing these procedures. This standard does not contain tests to demonstrate compliance with such requirements.

Document History

EN 61158-4-2
February 1, 2016
Industrial communication networks - Fieldbus specifications Part 4-2: Data-link layer protocol specification - Type 2 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...
October 1, 2013
Industrial communication networks - Fieldbus specifications Part 4-2: Data-link layer protocol specification - Type 2 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...
November 1, 2008
Industrial communication networks - Fieldbus specifications Part 4-2: Data-link layer protocol specification - Type 2 elements
Questa prima edizione della EN 61158-4-2 sostituisce parzialmente le precedenti Norme EN 61158-4:2004 e IEC/PAS 62413:2005. Pur non contenendo rilevanti modifiche di natura tecnica, in questa...

References

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