BS EN IEC 61158-4-21:2019
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Industrial communication networks. Fieldbus specifications – Data-link layer protocol specification. Type 21 elements
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 114 |
IEC 61158-4-21:2019 describes 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 data link service provider and procedures for giving communication opportunities based on standard ISO/IEC 8802-3 MAC, with provisions for nodes to be added or removed during normal operation; structure of the fieldbus data link protocol data units (DLPDUs) used for the transfer of data and control information by the protocol of this standard, and their representation as physical interface data units. This second edition cancels and replaces the first edition published in 2010. This edition constitutes a technical revision. The main changes are: •added Frame control Value, DLM function and DLL constants; •changed NCM_RETRY_RNMS to NCM_CHECK_NET_INTEGRITY_REQ; •updated DLM state table; •miscellaneous editorial corrections.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 5 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 7 | CONTENTS |
| 12 | FOREWORD |
| 14 | INTRODUCTION |
| 15 | 1 Scope 1.1 General 1.2 Specifications 1.3 Procedures 1.4 Applicability 1.5 Conformance |
| 16 | 2 Normative references 3 Terms, definitions, symbols and abbreviations 3.1 Reference model terms and definitions |
| 18 | 3.2 Service convention terms and definitions |
| 19 | 3.3 Common terms and definitions |
| 22 | 3.4 Additional Type 21 definitions 3.5 Common symbols and abbreviations |
| 23 | 3.6 Additional Type 21 symbols and abbreviations |
| 24 | 4 Overview of the data-link protocol 4.1 General 4.2 Overview of medium access control 4.3 Service assumed from the physical layer |
| 25 | 4.4 DLL architecture 4.4.1 General Figures Figure 1 – Interaction of PhS primitives with DLE Tables Table 1 – DLL components |
| 26 | 4.4.2 DLL management (DLM) interface support function Figure 2 – Data-link layer architecture |
| 27 | 4.5 Data type 4.5.1 General 4.5.2 Boolean 4.5.3 Unsigned integer Table 2 – UNSIGNEDn data type |
| 28 | 4.5.4 Signed integer 4.5.5 Octet String 4.5.6 Visible String Table 3 – INTEGERn data type |
| 29 | 4.5.7 Time of day 4.6 Local parameters and variables 4.6.1 General 4.6.2 DLE configuration parameters |
| 30 | 4.6.3 Queues to support data transfer Table 4 – DLE configuration parameters Table 5 – Queues to support data transfer |
| 31 | 4.6.4 Variables to support SAP management Figure 3 – Relationships of DLSAPs, DLSAPaddresses, and group DLaddresses Table 6 – Variables to support SAP management |
| 32 | 4.6.5 Variables to support local device information management Table 7 – Variables to support device information management |
| 33 | Table 8 – DL–entity identifier Table 9 – Device Flags Table 10 – DLM state |
| 34 | Table 11 – Device Unique Identification Table 12 – Unique identification of device connected to R-port1 Table 13 – Unique identification of device connected to R-port2 Table 14 – MAC address |
| 35 | Table 15 – Port information Table 16 – Protocol version |
| 36 | 4.6.6 Variables and counter to support network information management Table 17 – Device type Table 18 – Device description Table 19 – Hop count |
| 37 | Table 20 – Variables to support managing network information Table 21 – Topology Table 22 – Collision count |
| 38 | Table 23 – Device count Table 24 – Topology change count Table 25 – Last topology change time Table 26 – RNMP device UID |
| 39 | Table 27 – RNMS device UID Table 28 – LNM device UID for R-port1 Table 29 – LNM device UID for R-port2 |
| 40 | 4.6.7 Variables and counter to support a device path information management Table 30 – Network flags |
| 41 | Table 31 – Variables and counter to support managing path information Table 32 – Hop count for R-port1 direction |
| 42 | Table 33 – Hop count for R-port2 direction Table 34 – Preferred R-port Table 35 – Destination R-port |
| 43 | Table 36 – In net count Table 37 – In net time |
| 44 | 4.6.8 Variables, counters, timers, and queues to support path table management 5 General structure and encoding 5.1 Overview 5.2 MAPDU structure and encoding Table 38 – Out net count Table 39 – Out net time |
| 45 | 5.3 Common MAC frame structure, encoding and elements of procedure 5.3.1 MAC frame structure 5.3.2 Elements of the MAC frame Figure 4 – Common MAC frame format for Type 21 DLPDU Figure 5 – MAC frame format for other protocols |
| 46 | 5.3.3 Elements of the Type 21 DLPDU Figure 6 – Version and Length field |
| 47 | Figure 7 – DST_addr field Table 40 – Version and Length Table 41 – Destination DL–entity identifier |
| 48 | Figure 8 – SRC_addr field Figure 9 – Frame Control Field Table 42 – Source DL–entity identifier |
| 49 | Table 43 – Frame control |
| 51 | Figure 10 – Extension field |
| 52 | Figure 11 – DSAP field Table 44 – Extension Table 45 – Destination service access point |
| 53 | Figure 12 – Source service access point field Figure 13 – Length of group mask and extension information Figure 14 – Group mask option field Table 46 – source service access point |
| 54 | 5.4 Order of bit transmission 5.5 Invalid DLPDU 6 DLPDU structure and procedure 6.1 General 6.2 Common DLPDU Field 6.2.1 General |
| 55 | 6.2.2 Version 6.2.3 Length 6.3 DLDATA Transfer 6.3.1 DT DLPDU Figure 15 – Common DLPDU field Figure 16 – Building a DT DLPDU Figure 17 – DT DLPDU structure |
| 56 | Table 47 – DT DLPDU parameters |
| 57 | Table 48 – Primitives exchanged between DLSuser and DLE to send a DT DLPDU |
| 58 | 6.4 DLSPDATA Transfer 6.4.1 SPDT DLPDU Figure 18 – SPDT DLPDU structure Table 49 – Primitives exchanged between DLSuser and DLEs to receive a DT DLPDU Table 50 – SPDT DLPDU Parameters |
| 59 | 6.5 Network control messages 6.5.1 General 6.5.2 NCM_LA DLPDU Table 51 – Primitive exchanged between DLSUser and DLEs to send an SPDT DLPDU Table 52 – Primitives exchanged between DLSuser and DLEs to receive an SPDT DLPDU |
| 60 | Figure 19 – NCM_LA DLPDU structure Table 53 – NCM_LA DLPDU parameters |
| 61 | 6.5.3 NCM_AT DLPDU Table 54 – NCM_AT DLPDU parameters |
| 62 | 6.5.4 NCM_LS DLPDU Table 55 – NCM_LS DLPDU parameters |
| 63 | 6.5.5 NCM_RS DLPDU Table 56 – NCM_RS DLPDU parameters |
| 64 | 6.5.6 NCM_AR_DLPDU 6.5.7 NCM_AR DLPDU structure Table 57 – NCM_AR DLPDU parameters |
| 65 | 7 DLE elements of procedure 7.1 Overall structure Figure 20 – DLL structure and elements |
| 66 | 7.2 DLprotocol machine (DLPM) 7.2.1 Overview 7.2.2 Primitive definitions Table 58 – Primitives exchanged between DLPM and DLSuser |
| 67 | Table 59 – Parameters exchanged between DLPM and DLSuser |
| 68 | Table 60 – Primitives exchanged between DLPM and DLM |
| 69 | 7.2.3 DLPM state table Figure 21 – State transition diagram of the DLPM Table 61 – Parameters used with primitives exchanged between DLPM and DLM |
| 70 | Table 62 – DLPM state table |
| 73 | 7.2.4 DLPM functions Table 63 – DLPM functions table |
| 74 | 7.3 DLL management Protocol 7.3.1 Overview 7.3.2 Primitive definitions |
| 75 | Table 64 – Primitives exchanged between DLM and DLSuser |
| 76 | Table 65 – Parameters used with primitives exchanged between DLM and DLSuser Table 66 – Primitive exchanged between DLM and DMAC |
| 77 | 7.3.3 DLM state table Table 67 – Parameters used with primitives exchanged between DLM and DMAC Table 68 – Primitive exchanged between DLM and DPHY Table 69 – Parameters used with primitives exchanged between DLM and DPHY |
| 78 | Figure 22 – State transition diagram of DLM |
| 79 | Table 70 – DLM state table |
| 101 | 7.3.4 DLM functions Table 71 – DLM function table |
| 110 | 8 Constants and error codes 8.1 General |
| 111 | 8.2 Constants Table 72 – DLL constants |
| 112 | 8.3 Data-link layer error codes Table 73 – Type 21 DLL error codes |
| 113 | Bibliography |
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BS EN IEC 61158-4-21:2019 – TC:2020 Edition
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