Omron SYSMAC CS Series Instruction & Reference Manual page 1074

3. Instructions
The specified task's task number
is higher than the local task's task
number (m<n).
Task m
Task n
Hint
• The CX-Programmer's General Properties Tab for each task has a setting (the Operation start box)
that specifies whether the cyclic task will be executable at startup. When the Operation start box has
been checked, the corresponding cyclic task will be put in executable status automatically when the
PLC begins operation. All other cyclic tasks will be in non-executable status.
(If the memory all clear operation is executed from the Programming Console, however, cyclic task 0
will automatically be made executable.)
• If a task is in non-executable status, TKON(820) can be executed to put that task into executable
status. Likewise, a cyclic task in executable status can be put into non-executable status with the
TKOF(821) instruction.
 TKON
Cyclic tasks or extra cyclic tasks that were made executable will be put in executable status in that
cycle in task-number order. Consequently, a task will not be executed if it is put into standby status
before the cycle's processing reaches that task as each task is executed in task-number order.
 TKOF
Cyclic tasks or extra cyclic tasks that are in executable status can be put into standby status by the
TKOF(821) instruction.
1040
The specified task's task number
is lower than the local task's task
number (m>n).
Task n
In standby
status that
cycle.
Task m
In standby
status the
next cycle.
CS/CJ/NSJ Series Instructions Reference Manual (W474)