Re: asyn trace masks on modbus reconnect

[John Dobbins via Tech-talk <tech-talk at aps.anl.gov>]

Funny you should ask.  I am looking at this IOC built by someone else and modbus is installed with no obvious version label. Any easy well to tell?

John

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From: Mark Rivers <rivers at cars.uchicago.edu>
Sent: Thursday, March 31, 2022 8:11 PM
To: John Dobbins <john.dobbins at cornell.edu>
Cc: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Re: asyn trace masks on modbus reconnect

 

What version of the Modbus module?

Sent from my iPhone

On Mar 31, 2022, at 6:57 PM, John Dobbins via Tech-talk <tech-talk at aps.anl.gov> wrote:



All,

We have  a WAGO plc which we read via modbus. There are just 18 PVs in this IOC, read as two blocks from the plc. All the PVs briefly go invalid for ~ 5 seconds (as reported by clients like Alarm Server, Archive Appliance)

Am I correct in assuming that if this was because the IOC lost its connection to the plc, this would be reported as an error in the IOC console [asynTraceMask is not explicitly set so it is the default value of 1?]

Thanks,

John Dobbins

Research Support Specialist

Cornell High Energy Synchrotron Source

Cornell University

www.chess.cornell.edu