Hi All,
System Intro:
We have a labelling system running on the production line . For controls, B&R PLC (X20CP1584) is used and HERMA 400 for labelling application. They are communicating via Modbus RTU. Modbus RTU master (X20CS1030) is used to Tx and Rx data to/from Herma 400.
Communication Set up:
Modbus Master sends signal to Herma 400 (x13 port), then port x14 goes to herma 400_2 (x13 port) and so on. We have total 4 Labelers on this bus topology.
Herma 400 Power connection:
Herma is supplied 230VAC from the panel. Then it has filtering circuit and controllers for Panasonic servo motor. At the end, we have AC to DC convertor circuit which supplies 24VDC to communication card.
So, the issue is that - communication module (where x13 and x14 connects) inside herma 400 getting burnt up, frequently.
Incident 1: 2 weeks ago, all 4 of them were affected at the same time. All labelers lost communication to PLC. Once we replaced communication cards, all started running fine.
Incident 2: After that incident, we bypass no 1 labeler and now communication signal is going trough no2, then 3 and then 4. But, yesterday, operation of no 2 was affected the way. Communication failure.
It is hard to understand what is causing this. Is it from the PLC side (Master Modbus) or the 230VAC supply or the micro board circuit(AC to DC).
Surge protector and breakers are fine. And in working condition. Hope somebody here can point in right direction.
System Intro:
We have a labelling system running on the production line . For controls, B&R PLC (X20CP1584) is used and HERMA 400 for labelling application. They are communicating via Modbus RTU. Modbus RTU master (X20CS1030) is used to Tx and Rx data to/from Herma 400.
Communication Set up:
Modbus Master sends signal to Herma 400 (x13 port), then port x14 goes to herma 400_2 (x13 port) and so on. We have total 4 Labelers on this bus topology.
Herma 400 Power connection:
Herma is supplied 230VAC from the panel. Then it has filtering circuit and controllers for Panasonic servo motor. At the end, we have AC to DC convertor circuit which supplies 24VDC to communication card.
So, the issue is that - communication module (where x13 and x14 connects) inside herma 400 getting burnt up, frequently.
Incident 1: 2 weeks ago, all 4 of them were affected at the same time. All labelers lost communication to PLC. Once we replaced communication cards, all started running fine.
Incident 2: After that incident, we bypass no 1 labeler and now communication signal is going trough no2, then 3 and then 4. But, yesterday, operation of no 2 was affected the way. Communication failure.
It is hard to understand what is causing this. Is it from the PLC side (Master Modbus) or the 230VAC supply or the micro board circuit(AC to DC).
Surge protector and breakers are fine. And in working condition. Hope somebody here can point in right direction.
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