Convert STEP 5 RU/SU to STEP 7
Why are the STEP 5 commands RU... and SU... converted with NOT R... and NOT S... and not with the SET command at a S5/S7 conversion?
The conversion with NOT R... and NOT S... (negation of the VKE) results in having the same value of the VKE (connection result) after the operation as before the operation. One of the two following "S/R-commands" is executed in any case, so that the result will always be correct. The SET command, however, changes the VKE and should not be used for this issue.