mode of operation (SIL)
way in which a safety-related system is intended to be used, with respect to the frequency of demands made upon it, which may be either low demand mode, where the frequency of demands for operation made on a safety related, system is no greater than one per year and no greater than twice the proof-test, frequency; or high demand or continuous mode, where the frequency of demands for operation made, on a safety-related system is greater than one per year or greater than twice the proof check frequency
- Used by classes
- 2
- Code
ABB910- Data type
- ENUM_STRING_TYPEABL497mode of operation (SIL)
- Value list
- ABL497mode of operation (SIL)
Version history7#
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Metadata#
- Source document
- IEC 61508-4 MOD
- Version
- 6
- Revision
- 1
- Status
- Standard
- Publisher
- IEC
- Published in
- IEC 61987
- Responsible committee
- IEC/SC 65E
- Change request
C00185- Dates
- Original: 2017-12-07
- Current version: 2025-08-04
- Current revision: 2025-08-04