Alarm Limits Don't Convey Nom/Tol
Alarm limits are only ever reported as minimum and maximum and never as nominal and tolerance.
#2 Updated by Beau Harrison 3 months ago
Patrick Dowdle is reporting that L:ATOR.ANALOG_ALARM which is a nom/tol device is reporting the nom/tol values in the min/max fields of the JS DPM. I think what Rich is saying is that he expects the returned alarm limits to always be min/max. That doesn't appear to be the case.
#3 Updated by Richard Neswold 3 months ago
- Status changed from New to Assigned
Beau posted a comment by me:
Rich: "In MOOC, we only support MIN/MAX. If a NOM/TOL alarm block is downloaded to the front-end, it gets converted."
It's actually worse than that. MOOC only supports MINMAX, unless the comments are lying:
and the symbol isn't used anywhere in the codebase. This value is in the
.K field of the analog alarm block. The only place in MOOC where this is referred is here:
where it sets it to
MINMAX unconditionally (and doesn't even use the
MINMAX symbol to do it!) So to summarize: MOOC doesn't support NOM/TOL, and rather than return an error or converting a NOM/TOL alarm block, it interprets it as MIN/MAX.
#5 Updated by Beau Harrison 3 months ago
There's a big caveat here that may not be obvious to users, all alarm limits are reported as min/max even if they are nom/tol. I don't think this is a problem.
Patrick's issue is specifically with a few devices on LIP (IRM) nodes. The min value is larger than the max values and doesn't align with the database in any way that I can see.