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IEC 61158-4-25
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 4-25: Data-link layer protocol specification – Type 25 elements
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IEC 61158-4-25
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 4-25: Data-link layer protocol specification – Type 25 elements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-6780-6
– 2 – IEC 61158-4-25:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
1.1 General . 8
1.2 Specifications . 8
1.3 Procedures . 8
1.4 Applicability . 9
1.5 Conformance . 9
2 Normative references . 9
3 Terms, definitions, symbols, abbreviations and conventions . 9
3.1 Reference model terms and definitions . 10
3.2 Service convention terms and definitions . 11
3.3 Terms and definitions. 11
3.4 Symbols and abbreviations . 13
3.5 Common conventions . 14
3.6 Additional Type 25 conventions . 16
3.6.1 Primitive conventions . 16
3.6.2 State machine conventions . 16
4 Overview of the DL-protocol . 17
4.1 General . 17
4.2 Overview of the medium access control . 17
4.2.1 General . 17
4.2.2 Network topology . 18
4.2.3 Priority control with VLAN . 19
4.2.4 The maximum delivery delay in Type 25 network . 20
4.2.5 Traffic control for real-time communication . 21
4.3 Service assumed from PhL . 21
4.4 DL Layer architecture. 22
4.5 Local parameters and variables . 23
4.5.1 Overview . 23
4.5.2 Variables, parameter, counter and timer . 23
5 General structure and encoding of PhPDUs and DLPDU and related elements of
procedure . 24
5.1 Overview . 24
5.2 Common MAC frame structure, encoding and elements of procedure . 24
5.2.1 MAC frame structure . 24
5.2.2 Elements of the MAC frame . 25
6 DLPDU-specific structure, encoding and elements of procedure . 27
6.1 General . 27
6.2 Structure of the RCL DLPDU . 27
6.2.1 RCL header . 27
7 DLE elements of procedure . 29
7.1 Overview . 29
7.2 RCL communication control (RCLC) . 29
7.2.1 General . 29
7.2.2 Primitive definitions . 29
7.2.3 RCLC state machine . 32
7.2.4 Function of RCLC . 48
7.3 Real-time communication control (RTC) . 48
7.3.1 General . 48
7.3.2 Primitive definitions . 48
7.3.3 RTC state machine . 50
7.3.4 Function of RTC . 51
7.4 Transmit/Receive control (TRC) . 52
7.4.1 General . 52
7.4.2 Primitive definitions . 52
7.4.3 TRC state machine . 52
7.4.4 Function of TRC . 57
7.5 DLL management protocol (DLM) . 58
7.5.1 Overview . 58
7.5.2 Primitive definitions . 58
7.5.3 DLM state machine (DLM_SM) . 59
Bibliography . 61
Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses . 16
Figure 2 – Ring control in Type 25 network . 18
Figure 3 – Communication ranges of Type 25 frames . 19
Figure 4 – Priority control with VLAN of Type 25 network . 20
Figure 5 – The mechanism of transmission delay in a node . 20
Figure 6 – The maximum delay in Type 25 network . 21
Figure 7 – Data-Link layer internal architecture . 22
Figure 8 – Type 25 fieldbus DLPDU frame format . 25
Figure 9 – RCL frame format. 26
Figure 10 – State transition diagram of RHE_SM-A . 33
Figure 11 – State transition diagram of RHE_SM-B . 36
Figure 12 – The state diagram of RCLNode_SM . 39
Figure 13 – The state diagram of RCLTR_SM . 46
Figure 14 – The state diagram of RTTR_SM . 51
Figure 15 – The state diagram of TRC_SM . 52
Figure 16 – The state diagram of DLM_SM . 59
Table 1 – State transition descriptions . 16
Table 2 – Descriptions of state machine elements . 17
Table 3 – Conventions used in state machine . 17
Table 4 – Characteristics of the node states . 18
Table 5 – Characteristic of the frame classes . 19
Table 6 – VLAN priority mapping of Type 25 network . 19
Table 7 – Data-link layer components . 22
Table 8 – Destination address format . 25
Table 9 – VLAN tag format . 26
Table 10 – Types and classes of RCL frames . 27
– 4 – IEC 61158-4-25:2019 © IEC 2019
Table 11 – Structure of RCL header . 28
Table 12 – Class field format . 28
Table 13 – Destination address field format . 28
Table 14 – Source address field format . 29
Table 15 – CMD field format . 29
Table 16 – The primitives and parameters for DLS-user interface .
...