Does an OPC-tag only change when a value is received or could change based on other parameters?

Ignition
1

Maybe is a silly question. But we are getting random zeros from a value. The machine vendor said that that should not happend... But is happening... We are trying to see if it's a problem from Ignition.

Our current setup is an OPC-tag with an historian setting on change with the deadband in off mode. There we get random zeros.

My question is: Is this directly binded with what is being sent from the machine?
If the answer is Yes, then we know that the machine is sending us random zeros, if not, we will have to continue looking.

Thanks in advance!

PS: The quality when we get a zero is good, so it does not look like a connection problem.

2

You should open a support ticket. You will likely be asked to turn off encryption for that connection so that you can get a meaningful wireshark capture. (I suspect you really are getting a zero, due to sloppy PLC code. Or perhaps a bug in that server's OPC implementation.)

1 Like