IEC 61158-6-2:2014

Industrial communication networks - Fieldbus specifications - Part 6-2: Application layer protocol specification - Type 2 elements

IEC 61158-6-2:2014 defines the protocol provided to define the wire-representation of the service primitives defined in IEC 61158-5-2, and define the externally visible behavior associated with their transfer. This standard specifies the protocol of the Type 2 fieldbus application layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545). This third edition cancels and replaces the second edition published in 2010 and constitutes a technical revision. The main changes are:
- Updates of definition used by the Time Sync object;
- Addition of "member" and object specific services in 4.1.2.1, 4.1.8, 4.1.10, 8.2;
- Removal of obsolete transport classes 4 to 6 in 4.1.4.6, and 9.3.9 to 9.3.12;
- Clarification of transport header formats in 4.1.4;
- Update of CM and MR PDUs in 4.1.5 to 4.1.7;
- Updates of Identity object PDUs in 4.1.8.2;
- Updates of Assembly object PDUs in 4.1.8.4;
- Updates of Time sync object PDUs in 4.1.8.6;
- Updates of Parameter object PDUs in 4.1.8.7;
- Updates of Connection Manager object PDUs in 4.1.8.8;
- Updates of message and connection paths in 4.1.9;
- Updates of object class codes in 4.1.10 and error codes in 4.1.11;
- Updates of data types in 4.2.4 and 5.2.3;
- Updates of the encapsulation abstract syntax in 4.3;
- Updates to the DLL mapping protocol machine 2 in Clause 11.

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 6-2: Spécification du protocole de la couche application - Eléments de type 2

L'IEC 61158-6-2:2014 décrit le protocole mis en place pour définir la représentation filaire des primitives de service définies dans la CEI 61158-5-2 et définir le comportement visible de l'extérieur associé à leur transfert. La présente norme spécifie le protocole de la couche application de bus de terrain de Type 2, en conformité avec le modèle de référence de base OSI (ISO/CEI 7498-1) et la structure de la couche application OSI (ISO/CEI 9545). Cette troisième édition annule et remplace la deuxième édition parue en 2010. Elle constitue une révision technique. Les principales modifications par rapport à l'édition précédente sont les suivantes:
- mise à jour des définitions utilisées par l'objet Time Sync;
- ajout de "membre" et des services spécifiques à un objet en 4.1.2.1, 4.1.8, 4.1.10, 8.2;
- suppression des classes de transport obsolètes 4 à 6 en 4.1.4.6 et de 9.3.9 à 9.3.12;
- clarification des formats d'en-tête de transport en 4.1.4;
- mise à jour du CM et des PDU de MR de 4.1.5 à 4.1.7;
- mise à jour des PDU de l'objet Identity en 4.1.8.2;
- mise à jour des PDU de l'objet Assembly en 4.1.8.4;
- mise à jour des PDU de l'objet Time Sync en 4.1.8.6;
- mise à jour des PDU de l'objet Parameter en 4.1.8.7;
- mise à jour des PDU de l'objet Connection Manager en 4.1.8.8;
- mise à jour des chemins de message et de connexion en 4.1.9;
- mise à jour des codes de classe d'objet en 4.1.10 et des codes d'erreur en 4.1.11;
- mise à jour des types de données en 4.2.4 et 5.2.3;
- mise à jour de la syntaxe abstraite d'encapsulation en 4.3;
- mise à jour du diagramme protocolaire de mapping DLL 2 à l'Article 11.

General Information

• Status: Published
• Publication Date: 18-Aug-2014
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 35.100.70 - Application layer
• ICS: 35.110 - Networking
• Technical Committee: SC 65C - Industrial networks
• Current Stage: DELPUB - Deleted Publication
• Start Date: 20-Jun-2019
• Completion Date: 26-Oct-2025

Relations

• Revises: IEC 61158-6-2:2010 - Industrial communication networks - Fieldbus specifications - Part 6-2: Application layer protocol specification - Type 2 elements
• Effective Date: 05-Sep-2023
• Revised: IEC 61158-6-2:2019 - Industrial communication networks - Fieldbus specifications - Part 6-2: Application layer protocol specification - Type 2 elements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61158-6-2 ®
Edition 3.0 2014-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 6-2: Application layer protocol specification – Type 2 elements

Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 6-2: Spécification du protocole de la couche application – Eléments
de type 2
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IEC 61158-6-2 ®
Edition 3.0 2014-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –

Part 6-2: Application layer protocol specification – Type 2 elements

Réseaux de communication industriels – Spécifications des bus de terrain –

Partie 6-2: Spécification du protocole de la couche application – Eléments

de type 2
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XH
ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-1756-6

– 2 – IEC 61158-6-2:2014 © IEC 2014

CONTENTS
FOREWORD . 12

INTRODUCTION . 14

1 Scope . 15

1.1 General . 15

1.2 Specifications . 15

1.3 Conformance . 16

2 Normative references . 16

3 Terms, definitions, symbols, abbreviations and conventions . 18
3.1 Terms and definitions from other ISO/IEC standards . 18
3.2 Terms and definitions from IEC 61158-5-2. 19
3.3 Additional terms and definitions . 19
3.4 Abbreviations and symbols . 26
3.5 Conventions . 27
4 Abstract syntax . 32
4.1 FAL PDU abstract syntax . 32
4.2 Data abstract syntax specification . 149
4.3 Encapsulation abstract syntax . 154
5 Transfer syntax . 171
5.1 Compact encoding . 171
5.2 Data type reporting . 179
6 Structure of FAL protocol state machines . 186
7 AP-Context state machine . 187
7.1 Overview . 187
7.2 Connection object state machine . 187
8 FAL service protocol machine (FSPM) . 195
8.1 General . 195
8.2 Primitive definitions . 195
8.3 Parameters of primitives . 199
8.4 FSPM state machines . 200
9 Application relationship protocol machines (ARPMs) . 200
9.1 General . 200

9.2 Connection-less ARPM (UCMM) . 201
9.3 Connection-oriented ARPMs (transports) . 210
10 DLL mapping protocol machine 1 (DMPM 1) . 238
10.1 General . 238
10.2 Link producer . 238
10.3 Link consumer . 239
10.4 Primitive definitions . 239
10.5 DMPM state machine . 241
10.6 Data-link Layer service selection . 243
11 DLL mapping protocol machine 2 (DMPM 2) . 243
11.1 General . 243
11.2 Mapping of UCMM PDUs . 243
11.3 Mapping of transport class 0 and class 1 PDUs . 251
11.4 Mapping of transport class 2 and class 3 PDU’s . 252

11.5 Mapping of transport classes 4 to 6 . 253

11.6 IGMP Usage . 253

11.7 Quality of Service (QoS) for CP 2/2 messages . 254

11.8 Management of an encapsulation session . 258

12 DLL mapping protocol machine 3 (DMPM 3) . 258

Bibliography . 259

Figure 1 – Attribute table format and terms . 27

Figure 2 – Service request/response parameter . 28

Figure 3 – Example of an STD . 31
Figure 4 – Network connection parameters . 54
Figure 5 – Time tick . 57
Figure 6 – Connection establishment time-out . 59
Figure 7 – Member ID/EX description (WORD) . 71
Figure 8 – Transport Class Trigger attribute . 103
Figure 9 – CP2/3_initial_comm_characteristics attribute format . 107
Figure 10 – Segment type . 116
Figure 11 – Port segment . 117
Figure 12 – Logical segment encoding . 119
Figure 13 – Extended network segment . 124
Figure 14 – Symbolic segment encoding . 125
Figure 15 – Encapsulation message . 154
Figure 16 – FixedLengthBitString compact encoding bit placement rules . 176
Figure 17 – Example compact encoding of a SWORD FixedLengthBitString . 176
Figure 18 – Example compact encoding of a WORD FixedLengthBitString . 176
Figure 19 – Example compact encoding of a DWORD FixedLengthBitString . 176
Figure 20 – Example compact encoding of a LWORD FixedLengthBitString . 176
Figure 21 – Example 1 of formal encoding of a structure type specification . 181
Figure 22 – Example 2 of formal encoding of a structure type specification . 182
Figure 23 – Example 3 of formal encoding of a handle structure type specification . 182
Figure 24 – Example 4 of formal encoding of a handle structure type specification . 183

Figure 25 – Example 5 of abbreviated encoding of a structure type specification . 183
Figure 26 – Example 1 of formal encoding of an array type specification . 184
Figure 27 – Example 2 of formal encoding of an array type specification . 185
Figure 28 – Example 1 of abbreviated encoding of an array type specification . 186
Figure 29 – Example 2 of abbreviated encoding of an array type specification . 186
Figure 30 – I/O Connection object state transition diagram . 187
Figure 31 – Bridged Connection object state transition diagram . 191
Figure 32 – Explicit Messaging Connection object state transition diagram . 192
Figure 33 – State transition diagram of UCMM client9 . 203
Figure 34 – State transition diagram of high–end UCMM server . 205
Figure 35 – State transition diagram of low–end UCMM server . 207
Figure 36 – Sequence diagram for a UCMM with one outstanding message . 208
Figure 37 – Sequence diagram for a UCMM with multiple outstanding messages . 209

– 4 – IEC 61158-6-2:2014 © IEC 2014

Figure 38 – TPDU buffer . 210

Figure 39 – Data flow diagram using a client transport class 0 and server transport

class 0 . 213

Figure 40 – Sequence diagram of data transfer using transport class 0. 213

Figure 41 – Class 0 client STD . 214

Figure 42 – Class 0 server STD . 215

Figure 43 – Data flow diagram using client transport class 1 and server transport
class 1 . 216

Figure 44 – Sequence diagram of data transfer using client transport class 1 and

server transport class 1 . 217
Figure 45 – Class 1 client STD . 219
Figure 46 – Class 1 server STD . 220
Figure 47 – Data flow diagram using client transport class 2 and server transport
class 2 . 222
Figure 48 – Diagram of data transfer using client transport class 2 and server transport
class 2 without returned data . 223
Figure 49 – Sequence diagram of data transfer using client transport class 2 and
server transport class 2 with returned data . 224
Figure 50 – Class 2 client STD . 225
Figure 51 – Class 2 server STD . 227
Figure 52 – Data flow diagram using client transport class 3 and server transport
class 3 . 230
Figure 53 – Sequence diagram of data transfer using client transport class 3 and
server transport class 3 without returned data . 231
Figure 54 – Sequence diagram of data transfer using client transport class 3 and
server transport class 3 with returned data . 232
Figure 55 – Class 3 client STD . 234
Figure 56 – Class 3 server STD . 236
Figure 57 – Data flow diagram for a link producer and consumer . 238
Figure 58 – State transition diagram for a link producer . 242
Figure 59 – State transition diagram for a link consumer . 242
Figure 60 – DS field in the IP header . 255
Figure 61 – IEEE 802.1Q tagged frame . 256

Table 1 – Get_Attribute_All response service rules . 28
Table 2 – Example class level object/service specific response data of
Get_Attribute_All . 29
Table 3 – Example Get_Attribute_All data array method . 29
Table 4 – Set_Attribute_All request service rules . 30
Table 5 – Example Set_Attribute_All attribute ordering method . 30
Table 6 – Example Set_Attribute_All data array method . 30
Table 7 – State event matrix format . 32
Table 8 – Example state event matrix . 32
Table 9 – UCMM_PDU header format . 36
Table 10 – UCMM command codes . 36
Table 11 – Transport class 0 header . 37

Table 12 – Transport class 1 header . 37

Table 13 – Transport class 2 header . 37

Table 14 – Transport class 3 header . 37

Table 15 – Real-time data header – exclusive owner . 38

Table 16 – Real-time data header– redundant owner . 38

Table 17 – Forward_Open request format . 42

Table 18 – Forward_Open_Good response format . 43

Table 19 – Forward_Open_Bad response format . 44

Table 20 – Large_Forward_Open request format . 44
Table 21 – Large_Forward_Open_Good response format . 45
Table 22 – Large_Forward_Open_Bad response format . 46
Table 23 – Forward_Close request format . 46
Table 24 – Forward_Close_Good response format . 47
Table 25 – Forward_Close_Bad response format . 47
Table 26 – Unconnected_Send request format . 48
Table 27 – Unconnected_Send_Good response format . 49
Table 28 – Unconnected_Send_Bad response format . 49
Table 29 – Unconnected_Send request format (modified) . 50
Table 30 – Unconnected_Send_Good response format (modified) . 51
Table 31 – Unconnected_Send_Bad response format (modified). 51
Table 32 – Get_Connection_Data request format . 52
Table 33 – Get_Connection_Data response format . 52
Table 34 – Search_Connection_Data request format . 53
Table 35 – Get_Connection_Owner request format . 53
Table 36 – Get_Connection_Owner response format . 53
Table 37 – Time-out multiplier . 57
Table 38 – Time tick units . 57
Table 39 – Encoded application path ordering . 62
Table 40 – Transport class, trigger and Is_Server format . 63
Table 41 – MR_Request_Header format . 63
Table 42 – MR_Response_Header format . 64

Table 43 – Structure of Get_Attribute_All_ResponsePDU body . 64
Table 44 – Structure of Set_Attribute_All_RequestPDU body . 65
Table 45 – Structure of Get_Attribute_List_RequestPDU body . 65
Table 46 – Structure of Get_Attribute_List_ResponsePDU body . 65
Table 47 – Structure of Set_Attribute_List_RequestPDU body . 65
Table 48 – Structure of Set_Attribute_List_ResponsePDU body . 65
Table 49 – Structure of Reset_RequestPDU body . 66
Table 50 – Structure of Reset_ResponsePDU body . 66
Table 51 – Structure of Start_RequestPDU body . 66
Table 52 – Structure of Start_ResponsePDU body . 66
Table 53 – Structure of Stop_RequestPDU body . 66
Table 54 – Structure of Stop_ResponsePDU body . 67

– 6 – IEC 61158-6-2:2014 © IEC 2014

Table 55 – Structure of Create_RequestPDU body . 67

Table 56 – Structure of Create_ResponsePDU body . 67

Table 57 – Structure of Delete_RequestPDU body . 67

Table 58 – Structure of Delete_ResponsePDU body . 67

Table 59 – Structure of Get_Attribute_Single_ResponsePDU body . 68

Table 60 – Structure of Set_Attribute_Single_RequestPDU body . 68

Table 61 – Structure of Set_Attribute_Single_ResponsePDU body . 68

Table 62 – Structure of Find_Next_Object_Instance_RequestPDU body . 68

Table 63 – Structure of Find_Next_Object_Instance_ResponsePDU body . 68
Table 64 – Structure of Apply_Attributes_RequestPDU body . 69
Table 65 – Structure of Apply_Attributes_ResponsePDU body . 69
Table 66 – Structure of Save_RequestPDU body . 69
Table 67 – Structure of Save_ResponsePDU body . 69
Table 68 – Structure of Restore_RequestPDU body . 69
Table 69 – Structure of Restore_ResponsePDU body . 70
Table 70 – Structure of Get_Member_ResponsePDU body . 70
Table 71 – Structure of Set_Member_RequestPDU body . 70
Table 72 – Structure of Set_Member_ResponsePDU body . 70
Table 73 – Structure of Insert_Member_RequestPDU body . 70
Table 74 – Structure of Insert_Member_ResponsePDU body . 71
Table 75 – Structure of Remove_Member_ResponsePDU body . 71
Table 76 – Common structure of _Member_RequestPDU body (basic format) . 72
Table 77 – Common structure of _Member_ResponsePDU body (basic format) . 72
Table 78 – Common structure of _Member_RequestPDU body (extended format) . 72
Table 79 – Common structure of _Member_ResponsePDU body (extended format) . 73
Table 80 – Extended Protocol ID . 73
Table 81 – Structure of _Member_RequestPDU body (Multiple Sequential Members) . 73
Table 82 – Structure of _Member_ResponsePDU body (Multiple Sequential Members) . 74
Table 83 – Structure of _Member_RequestPDU body (International String Selection) . 74
Table 84 – Structure of _Member_ResponsePDU body (International String Selection). 74
Table 85 – Structure of Group_Sync_RequestPDU body . 75

Table 86 – Structure of Group_Sync_ResponsePDU body . 75
Table 87 – Identity object class attributes . 75
Table 88 – Identity object instance attributes . 75
Table 89 – Identity object bit definitions for status instance attribute . 77
Table 90 – Default values for extended device status field (bits 4 to 7) of status
instance attribute . 77
Table 91 – Class level object/service specific response data of Get_Attribute_All . 77
Table 92 – Instance level object/service specific response data of Get_Attribute_All . 78
Table 93 – Object-specific parameter for Reset . 78
Table 94 – Reset service parameter values . 78
Table 95 – Message Router object class attributes . 79
Table 96 – Message Router object instance attributes . 79

Table 97 – Class level object/service specific response data of Get_Attribute_All . 79

Table 98 – Instance level object/service specific response data of Get_Attribute_All . 80

Table 99 – Structure of Symbolic_Translation_RequestPDU body . 80

Table 100 – Structure of Symbolic_Translation_ResponsePDU body . 80

Table 101 – Object specific status for Symbolic_Translation service . 80

Table 102 – Assembly object class attributes . 81

Table 103 – Assembly object instance attributes . 81

Table 104 – Assembly Instance ID ranges . 81

Table 105 – Acknowledge Handler object class attributes . 82
Table 106 – Acknowledge Handler object instance attributes . 83
Table 107 – Structure of Add_AckData_Path_RequestPDU body . 83
Table 108 – Structure of Remove_AckData_Path_RequestPDU body . 83
Table 109 – Time Sync object class attributes . 84
Table 110 – Time Sync object instance attributes . 84
Table 111 – ClockIdentity encoding for different network implementations . 87
Table 112 – ClockClass values . 88
Table 113 – TimeAccuracy values . 88
Table 114 – TimePropertyFlags bit values . 89
Table 115 – TimeSource values . 89
Table 116 – Types of Clock . 89
Table 117 – Network protocol to PortPhysicalAddressInfo mapping . 89
Table 118 – Parameter object class attributes. 90
Table 119 – Parameter Class Descriptor bit values . 90
Table 120 – Parameter object instance attributes . 91
Table 121 – Semantics of Descriptor Instance attribute. 92
Table 122 – Minimum and Maximum Value semantics. 92
Table 123 – Scaling Formula attributes . 93
Table 124 – Scaling links . 94
Table 125 – Class level object/service specific response data of Get_Attribute_All . 95
Table 126 – Instance level object/service specific response data of Get_Attribute_All
(Parameter object stub) . 95

Table 127 – Instance level object/service specific response data of Get_Attribute_All
(full Parameter object) . 96
Table 128 – Structure of Get_Enum_String_RequestPDU body . 97
Table 129 – Structure of Get_Enum_String_ResponsePDU body . 97
Table 130 – Enumerated strings Type versus Parameter data type . 97
Table 131 – Connection Manager object class attributes . 98
Table 132 – Connection Manager object instance attributes . 98
Table 133 – Class level object/service specific response data of Get_Attribute_All . 99
Table 134 – Instance level object/service specific response data of Get_Attribute_All . 99
Table 135 – Instance level object/service specific request data of Set_Attribute_All . 100
Table 136 – Connection object class attributes . 101
Table 137 – Connection object instance attributes . 101
Table 138 – Values assigned to the state attribute . 102

– 8 – IEC 61158-6-2:2014 © IEC 2014

Table 139 – Values assigned to the instance_type attribute . 103

Table 140 – Possible values within Direction Bit . 104

Table 141 – Possible values within Production Trigger Bits . 104

Table 142 – Possible values within Transport Class Bits . 105

Table 143 – TransportClass_Trigger attribute values summary . 105

Table 144 – Transport Class 0 client behavior summary . 106

Table 145 – Transport Class 1, 2 and 3 client behavior summary . 106

Table 146 – Values defined for the CP2/3_produced_connection_id attribute . 106

Table 147 – Values defined for the CP2/3_consumed_connection_id attribute . 107
Table 148 – Values for the Initial Production Characteristics nibble . 108
Table 149 – Values for the Initial Consumption Characteristics nibble . 109
Table 150 – Values for the watchdog_timeout_action. 112
Table 151 – Structure of Connection_Bind_RequestPDU body . 114
Table 152 – Object specific status for Connection_Bind service . 114
Table 153 – Structure of Producing_Application_Lookup_RequestPDU body . 114
Table 154 – Structure of Producing_Application_Lookup_ResponsePDU body . 114
Table 155 – Producing_Application_Lookup Service status codes . 115
Table 156 – Possible port segment examples . 117
Table 157 – TCP/IP link address examples . 118
Table 158 – Extended Logical Type . 119
Table 159 – Electronic key segment format . 121
Table 160 – Logical segments examples . 122
Table 161 – Network segments . 122
Table 162 – Extended subtype definitions . 124
Table 163 – Symbolic segment examples . 125
Table 164 – Data segment . 126
Table 165 – ANSI_Extended_Symbol segment . 126
Table 166 – Addressing categories . 129
Table 167 – Class code ID ranges . 129
Table 168 – Attribute ID ranges . 130
Table 169 – Service code ranges . 130

Table 170 – Class codes . 131
Table 171 – Reserved class attributes for all object class definitions . 131
Table 172 – Common services list . 132
Table 173 – Message Router object specific services list . 133
Table 174 – Acknowledge Handler object specific services list . 133
Table 175 – Parameter object specific services list . 133
Table 176 – Services specific to Connection Manager . 133
Table 177 – Services specific to Connection object . 134
Table 178 – Device type numbering . 134
Table 179 – Connection Manager service request error codes . 136
Table 180 – General status codes . 144
Table 181 – Extended status code for a general status of "Key Failure in path . 146

Table 182 – Identity object status codes . 147

Table 183 – Encapsulation header . 155

Table 184 – Encapsulation command codes . 155

Table 185 – Encapsulation status codes . 157

Table 186 – Nop request encapsulation header . 158

Table 187 – RegisterSession request encapsulation header . 158

Table 188 – RegisterSession request data portion . 158

Table 189 – RegisterSession reply encapsulation header . 159

Table 190 – RegisterSession reply data portion . 159
Table 191 – UnRegisterSession request encapsulation header . 160
Table 192 – ListServices request encapsulation header . 160
Table 193 – ListServices reply encapsulation header . 161
Table 194 – ListServices reply data portion. 161
Table 195 – Communications capability flags . 162
Table 196 – ListIdentity request encapsulation header . 162
Table 197 – ListIdentity reply enca
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