Siemens HMI TP1200 is Modbus RTU master. Modbus device cam controller is slave.

The system is always having communications crash.

 

You need to provide some more information to get some help from this forum. For example:

1. What to you mean by a communication crash (e.g. symptoms, error codes or messages, etc.)?

2. Does it occur immediately or after a while?

3. How do you fix it?

4. Is this a new communication link?

5. If it is an existing communication link that worked before, what has changed?

6. What have you done to troubleshoot the problem?

William (Bill) L. Mostia, Jr. PE
ISA Fellow
WLM Engineering Co.
281-728-3722