Detects program calls
Justification: According to the IEC 61131-3 standard, programs can be called in the task configuration only. The code is more easily portable when you do not call programs from other locations.
Importance: Low
Example
PROGRAM prog_control VAR END_VAR PROGRAM PLC_PRG VAR END_VAR prog_control(); --> SA0120: Program call to 'prg_control' not allowed