- read-only from controller point of view
- state data
- measurement data - performance monitoring
- alarms (fault detection and is clearance - the ringing thing - detected condition) vs. fault (problem itself)
- multi state thing - nicely degraded, failed (example temperature )
- thresholds
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setter → intend agreement (controller sourced data - 100% controller responsibility)
achievement - acceptance of the agreement
measurement : result of the achievement