Omron SYSMAC CX-Programmer 8.1, Operation Manual

Page: 64 / 154

Elements of SFC Section 2-3
48
Controlling a Step in an SFC Program from an Action Ladder Program within
the Same SFC Program
SA
Activate
SFC Program
Controlling an SFC Step from an Action Ladder Program within Another SFC
Program
SA
SFC Program SFC Program
Activate
Note: If the SA step control instruction is used to activate another step in the same
SFC program from an action ladder program in the SFC program, the activated
step’s action will be executed in the next cycle.
If the SA step control instruction is used to activate a step in a different SFC program
from an action ladder program in the SFC program, the activated step’s action will be
executed in the current or in the next cycle, depending on the order of the SFC
program execution task numbers.
• If the SFC program containing the step activated with the SA step control
instruction has already been executed, the activated step will be executed in the
next cycle.
• If the SFC program containing the step activated with the SA step control
instruction has not yet been executed, the activated step will be executed in the
same cycle.
Step timer value read/set instructions can be used in the same way as step
activation/deactivation instructions.
• A step can have a step timer to maintain the time, which has elapsed since the step
became active. For each step, the time unit on the step timer can be set to either
of the following: