PM891 restared automatically


Due to following faults, the PM891 has been restaterd automatically at one of our sites.

1st restart on 22nd Sept 2016

This PM has been automatically restarted.
- SW_INTERRUPT, Software interrupt signal from CPU

2nd restart on 26th sept 2016

This PM has been automatically restarted.
- POWER_FAIL, Power fail signal from power supply

Kindly let me know whats the reason could be for this restart. i have attached the log file.

Best Regards
Sathish R


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asked 1 year ago




Are you communicating with other third party device via Modbus? Which 800xa version you are using?


answered 1 year ago


By sathish299 on 9/29/2016 | Like (0) | Report

Yes we are using CI867 for Modbus communication with 3rd party device.

Compact Control Builder is used.
Version : 5.1.0/1 (Build

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double post

Rob Lyon   

answered 1 year ago


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The software interrupt is from 2015 not 2016 so its 18 months ago.

Power failure usually means the power went off.

The modbus error messages indicate an error with the modbus slave and are probably completely unrelated, unless somebody was working on the power supply to the slave ?

Was anybody doing any maintenace on the plant ? Have you verified the power supply connections ?

Rob Lyon   

answered 1 year ago


By sathish299 on 10/2/2016 | Like (0) | Report

Plant was working normally until PM891 restarted and tripped he plant. There was no power failure, the power terminal was intact. There is no information Modbus slave, I will share once its available to me. But please look in this problem and give us a solution so similar tripping can be avoided.

By sathish299 on 10/3/2016 | Like (0) | Report

Update: Modbus slave was ok, no persons were working on slave modules.

By Rob Lyon on 10/3/2016 | Like (0) | Report

> There was no power failure,

The log says otherwise. The power to the CPU was off for 35 seconds.

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