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<== Date ==> <== Thread ==>
Subject: Modbus alarms question
From: John Dobbins via Tech-talk <tech-talk at aps.anl.gov>
To: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Wed, 8 Jul 2020 16:54:14 +0000
All,

We have a PLC from which data is read by an IOC via Modbus (R2-11).  The PLC was turned off and while the PLC was off the IOC generated a stream of alarm messages from the Alarm Server (BEAST) while the PVs toggled between  

SEVERITY: INVALID           STATUS: READ_ALARM

and

SEVERITY:  INVALID           STATUS: TIMEOUT_ALARM

Aside from configuring these alarms to be latching in the Alarm Server configuration is there some other way to make it so this state (loss of modbus communication) doesn't generate a stream of alarms?

Regards,

John Dobbins

Research Support Specialist
Cornell High Energy Synchrotron Source
Cornell University

www.chess.cornell.edu


Replies:
Re: Modbus alarms question Mark Rivers via Tech-talk
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