MonitoringNumber – OPC Unified Architecture – Part 15: Safety

OPC Unified Architecture – Part 15: Safety

v1.05.04

1Scope
2Normative references
3Terms, definitions, symbols, abbreviated terms and conventions
4Overview of OPC UA Safety
5General
6Safety communication layer services
7Safety communication layer protocol
- 7.1General
- 7.2SafetyProvider and SafetyConsumer
8Safety communication layer management
- 8.1General
- 8.2Safety function response time part of communication
9System requirements (SafetyProvider and SafetyConsumer)
10Assessment
11Profiles and Conformance Units
12Namespaces
- 12.1Namespace metadata
- 12.2Handling of OPC UA namespaces
Annex ASafety Namespace and mappings (Normative)
Annex BAdditional information (Informative)
Annex CInformation for assessment (Informative)
Bibliography

3.1.2.5 MonitoringNumber

means used to ensure the correct order among transmitted safety PDUs and to monitor the communication delay

Note 1

Note 1 to entry: Instance of sequence number as described in IEC 61784‑3.

Note 2 to entry: The MNR starts at a random value and is incremented with each request. It rolls over to a minimum threshold value that is not zero.

Note 3 to entry: The transmitted MNR is protected by the transmitted CRC signature of the ResponseSPDU.