Step 5 guru please.

I am a little rusty with step 5 and have encountered a problem.
When trying to observe the RLO of an FB i am getting a message saying " function identifier in IF unknown". Then asks if i want
to exit.
Any ideas and guidance would be much appreciated please.

Regards

Kev

Are you getting this message when using block status ?

Compare your PC program with your PLC program, I think I had a issue like this once and my programs were not the same, long time ago...

If your CPU has two ports use the port 1 (SSI1) for the status program.