Omron SYSMAC CS Series Operation Manual page 279

How to Use the Step Ladder Program Block
Note 1. The ON signal for one operation cycle that is generated by the differentiate up (DIFU) or differentiate
down (DIFD) command automatically turns OFF at the start of the Step Ladder Program block of the
next operation cycle. (This signal does not turn OFF by the DIFU or DIFD command in the Step Lad-
der Program.)
2. When the ON signal for one operation cycle that is generated by the DIFU or DIFD command is used
by another function block, set the operation cycle to the same or higher than the operation cycle of
the Step Ladder Program. The ON signal sometimes cannot be read normally when an operation cy-
cle that is lower than the operation cycle of the Step Ladder Program is set.
3. A contact ITEM that has been turned ON by the OUT command stays ON even if program execution
moves to the next STEP. For this reason, to perform step progression control in a step sequence, use
the RESET command at the next STEP to turn OFF the contact ITEM that has been turned ON.
Appendix A
247