COMM LOSS Siemens — Supervision Network Loss
At a glance
- Severity
- WARNING THEN STOP
- Domain
- SUPERVISION_SYSTEM
- Reference standard
- EN 50600-3-1 / ISO 27001
What it means
Loss of the supervision (OT) network: no visibility or control over the plant. The physical plant keeps running but operations go blind: the next fault goes unseen.
Probable causes
- Field switches or network failed or non-redundant
- Controller/server power not guaranteed
- Ungoverned configurations or updates
- Single network paths (single point of failure)
Where to start
Verify the outage perimeter (one controller, one line, the whole BMS) and the state of OT switches and power supplies.
Full guided diagnosis in the app
The diagnostic tree for this fault has 3 guided steps with measurements, checks and resolutions. You'll find it in DataCIQ, one of the five IndexOS apps: free, works offline.
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The same fault on other brands
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- NOTIFICATION FAULT — Alarms Not Notified
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- 6ES7522-1BL01-0AB0 — Digital output module — output not activating
- 6ES7531-7KF00-0AB0 — Analog input module — full-scale reading or error