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About This Item
Full Description
The data-link layer provides basic time-critical messaging communications between devices in an automation environment.
This part of IEC 61158 specifies a main protocol with the following characteristics.
• 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 can 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 DLSAP-addresses. Each link has a maximum of 224 related peer and publisher DLCEPs.
This document specifies additional lower layers protocols or implementations of additional lower layers protocols for use in combination with ISO/IEC/IEEE 8802-3.
This document specifies a set of corresponding objects providing a consistent management interface to the lower layers.
Document History
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IEC 61158-4-2 Ed. 5.0 b:2023
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Industrial communication networks - Fieldbus specifications - Part 4-2: Data-link layer protocol specification - Type 2 elements- Most Recent
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IEC 61158-4-2 Ed. 5.0 en:2023
Industrial communication networks - Fieldbus specifications - Part 4-2: Data-link layer protocol specification - Type 2 elements- Historical Version
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IEC 61158-4-2 Ed. 4.0 b:2019
Industrial communication networks - Fieldbus specifications - Part 4-2: Data-link layer protocol specification - Type 2 elements- Historical Version
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IEC 61158-4-2 Ed. 4.0 en:2019
Industrial communication networks - Fieldbus specifications - Part 4-2: Data-link layer protocol specification - Type 2 elements- Historical Version
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IEC 61158-4-2 Ed. 3.0 b:2014
Industrial communication networks - Fieldbus specifications - Part 4-2: Data-link layer protocol specification - Type 2 elements- Historical Version
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IEC 61158-4-2 Ed. 2.0 b:2010
Industrial communication networks - Fieldbus specifications - Part 4-2: Application layer protocol specification - Type 2 elements- Historical Version
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IEC 61158-4-2 Ed. 2.0 en:2010
Industrial communication networks - Fieldbus specifications - Part 4-2: Data-link layer protocol specification - Type 2 elements- Historical Version
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IEC 61158-4-2 Ed. 1.0 en:2007
Industrial communication networks - Fieldbus specifications - Part 4-2: Data-link layer protocol specification - Type 2 elements- Historical Version