A monitoring point needs a clock
Original diagram. Not a site record.
A point is a value, a time, a source, and a mark that says whether the value is still alive. A name on a tile is not those four. Without the time, a repeat of the last good reading looks like a change. Without the source, a calculation looks like a sensor. Without the quality mark, a gap dresses itself as a steady line.
If any of the three minimums is missing, the point is silent. It may be stored. It may not page, close an incident, or fill a capacity cell. Silence is not a failure of the plant. It is a failure of the point.
Measurement time and arrival time are different. The decision writes which one it uses. A page that cannot show the measurement time will be argued in the morning as a fresh event. Do not send that page.
Accept the source by failing it on purpose, on the image you will run. A demo on a vendor's hall accepts nothing on yours. Until the forced failure becomes a gap, or stale that refuses to page, the source is a candidate. Candidates do not wake people.
From When a Monitor May Speak, Tristan, Data Center Field Guides. No store link until the Kindle edition is listed.
Related: Stale is not green.
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BMS/EPMS Telemetry, Sequence of Events (SOE), Alarm Storm Suppression, and Sensor Quality Flags
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