Error writing values to tag: Read time out

Ignition
1

Configuration installation: PLC's are connected to kepserver.
Kepserver is configured as OPCUA via ignition gateway.

Since replacing a PLC, we are experiencing very slow communication between ignition and the kepserver. after entering a value via ignition client, it takes a lot of time to accept the value, most of the time this error appears:
Error writing 95 to tag [Tags]"Tag path" com.inductiveautomation.ignition.client.gateway_interface.GatewayException Read timed out

The new PLC (Schneider M580) is replacing an old Schneider Premium TSX PLC.
The Logic, Tags, parameters are mostly identical.
The program on the PLC runs with normal cyclus-times

We've checked the communication between PLC and kepserver, no read or write failiures, communication is stable.

How could we solve this problem?

2

Have you tried restarting the kepserver?

3

Yes I did, thanks for reaching out

4

Sounds like the new PLC is less capable than the old, at least for communications. There may be communication resource adjustments needed in the M580.

5

Thanks for reaching out Mr.
The strange thing Is that dataflow between PLC and kepserver goes flowless, when data changes in PLC, it changes on ignition within a second.
When writing a value in ignition, kepserver is blocking.
When writing a value via a modbus tool to the PLC, it goes flowless.

6

Try writing to the same slow tags with another OPC UA client such as UaExpert.

If it's slow there too you might need to get support from Kepware.

If it's not slow there, disable security on the OPC UA connection to Kepware and then get a Wireshark capture while initiating a write from Ignition.

7

I wouldn't waste your time on Kepware, in my experience it causes more issues than it solves. Consider going to the manufacturer provided solution that you can get direct support from the PLC manufacturer with.

8

Hi Frederik, it sounds like the new PLC might handle writes a bit differently than the old one. Have you tried changing the write settings in Kepserver? That might fix the delay. Also, testing with another OPC UA client like UaExpert could help check if the issue is with Kepserver or Ignition