RSLogix OPC server tags can not be read/write in desginer

Ignition
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1

I have connection between studio5000 emulator and Ignition via RSLinx OPC Server.
I can read and write tags in gateway.
However, I am unable to read or write tags in designer.

Designer
Designer1576×872 126 KB

Tags Reading in gateway
Tags Reading in gateway2913×1618 214 KB

2

Does Subscribe work in the quick client instead of Read?

3

No it shows uncertain_initial value

image
image1163×742 40 KB

4

If this is an OPC UA connection, set the log level for the loggers you get searching "OpcUaSubscriptionManager" and "OpcUaSubscriptionSynchronizer" to TRACE and then edit/save that connection. There should be some logs once the subscriptions are attempted that explain what's failing.

https://docs.inductiveautomation.com/display/DOC81/Diagnostics+-+Logs#DiagnosticsLogs-ChangingLoggingLevels

5

I solved it by changing tag group OPC data mode from subscribe to polled

image
image1506×767 97.7 KB

1 Like
6

So glad you asked this question, the unknown_last known value was driving me crazy. Thanks for the solution