"The RLO is not initializd. Access is invalid."

Need help with some code conversion.

In Step 5 STL a have some function witch starts with first network like this:

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Split from Step 5 migration STL.

Hi Kenzo,

I´ve got exactly the same situation. The program was migrated from S5 time ago, currently running on S7-300 with no problem. Now with the migration from S7-300 (Simatic S7) to S7-1500 (TIA), I get the same error, "The RLO is not initialized Access is invalid."

Testing my code with the S7-300 simulator, I can see that the program considers first line as RLO in 1 as you mentioned (first line is a “=”). I get the same behavior if I use a SET instruction in the first line and a different behavior if I use a CLR in the fisrt line (RLO = 0).

Hope this could be helpful for you.

Regards.