IEC 61158-4-1:2014
Industrial communication networks - Fieldbus specifications - Part 4-1: Data-link layer protocol specification - Type 1 elements

Standard No.

IEC 61158-4-1:2014

Release Date

2014

Published By

International Electrotechnical Commission (IEC)

Latest

IEC 61158-4-1:2014

Scope

General The data-link layer provides basic time-critical messaging communications between devices in an automation environment. This protocol provides the data-link service by making use of the services available from the physical layer. The relationship between the International Standards for fieldbus data-link service@ fieldbus data-link protocol@ fieldbus physical service and systems management is described in IEC 61158-1. This protocol provides communication opportunities to all participating data- link entities a) in a cyclic asynchronous manner@ sequentially to each of those data-link entities@ and b) in a synchronous manner@ either cyclically or acyclically@ according to a pre-established schedule. The specified protocol also provides means of changing the set of participating data- link entities and of modifying the set of scheduled communications opportunities. W hen the set of scheduled communications opportunities is null@ the distribution of communication opportunities to the participating data-link entities is completely asynchronous. Thus this protocol can be characterized as one which provides access asynchronously but with a synchronous overlay. 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. NOTE In IEC 61158-4-1@ gray boxes have been used in the tables to indicate that the specified field is not a conceptual part of the specific DLPDU. 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.

IEC 61158-4-1:2014 history

• 2014 IEC 61158-4-1:2014 Industrial communication networks - Fieldbus specifications - Part 4-1: Data-link layer protocol specification - Type 1 elements
• 2007 IEC 61158-4-1:2007 Industrial communication networks - Fieldbus specifications - Part 4-1: Data-link layer protocol specification - Type 1 elements