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Old January 8th, 2019, 01:23 AM   #1
2Faced
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Rx7i modbus RTU communications issue

Hi All,

I have a question would like to ask the experts: my system has two Rx7i PLCs and I'm having them communicate with an RTU (D25) via modbus RTU serial. Is there a way to monitor the communications between the PLCs and the RTU ? Is this something that can be done in the PLCs or it must be done in the RTU ? Sometimes the communication between one PLC to the RTU is lost but I don't know which one until getting to the site.

Thanks.
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Old January 8th, 2019, 06:53 AM   #2
gclshortt
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http://www.plctalk.net/qanda/showthread.php?t=62332

You could use a heartbeat to check communication between the 2 PLCs. See the link above.
Regards,
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Old January 11th, 2019, 02:29 AM   #3
2Faced
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Thanks. However my customer demands a communication monitoring function between the RTU and the PLCs, I have later figured out it can only be done in the RTU.
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