Ghost Alarms on MODBUS

We are experiencing a random flood of approx. 40 'ghost' alarms.

These occur with no apparent cause.

It has been noticed on the last two Warm downloads to the 800 XA HI Controller that

the alarm flood is generated.

There are 12 Comm's variables which hold the Modbus addresses transferred across the

800XA Ethernet Comms Link to Mod300 RS232 Module.

Information is sent Via 800XA CI867, Ch1 to Mod300 Comms module CI532 via Westermo SDW550 Ethernet Switches

and EDW100 TCP/RS232 Modbus Converters.

We have been unable to find any issue with the 800XA Configuration as the same information is sent to a Door mounted

Allen Bradley HMI on the 800XA CI867, Ch2 and we don't experience any off these issues.

Any Advice would be appreciated

 Comms Config.JPG

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asked 3 months ago


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