Mitsubishi 00JCPU User Manual page 74

(3) Precautions on programming
(a) Low-speed program execution time value setting
Setting a low-speed program execution time value increases the scan time since the set period of time is
secured.
Set a low-speed program execution time value so that the scan time becomes shorter than the watchdog timer
or increase the WDT setting value.
(b) Unavailable instruction
The COM instruction is not available for low-speed execution type programs.
(c) Execution timing
Low-speed execution type programs are executed even in the same scan where the initial execution type
program is executed.
To prevent low-speed execution type programs from being executed after the initial execution type program,
provide an interlock with the special relay (SM402 or SM403).
(d) Setting range
Set either a constant scan time value or low-speed program execution time value.
If both values are set, "PRG. TIME OVER" (error code: 5010) occurs under the following condition: (remaining
time in a constant scan) < (low-speed program execution time).
(e) Processing at program execution type change
For how to save and restore data in the index register when the program execution type is changed, refer to
Section 9.6.3.
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