Program to manage 5 Compressors

Hello norimane;

Have a look at the attached screencaptures, from these manauls:

SIMATIC S7-300 Instruction list S7-300 CPUs and ET 200 CPUs

SIMATIC STEP 7 V5.5 Statement List (STL) for S7-300 and S7-400 Programming

The AW instruction in STL is supported by your CPU, as you can see. It will apply a Word-wide AND between 2 values.

Just wondering, how have you setup your LB value? If it has not been initiated in your function, you cannot know what it contains.

What should you watch out for when using the local variable types OUT and TEMP in subprograms?

Hope this helps

Daniel chartier,