Error writing to tag

I got an error when trying to write a numeric value to an AB Compact Logix PLC.
here is the message:

Error writing to Tag DataOut
Gateway Comm Mode is not Read/Write

I had set access mode in general property to Read/Write
Using OPC QuickClient, I can read, write to the output- no problem

Any suggestion how to debug this?

Your designer is in read only mode. Set it to read/write mode. Its on the top bar in under the designer menu bar.

1 Like