Mitsubishi Q00JCPU User Manual page 248

6
FUNCTIONS
6
6.2 Constant scan
- 7
(a) Setting time condition
As the constant scan time, set a value that satisfies the following relational
expression.
If the sequence program scan time is longer than the constant scan setting time,
the CPU module detects PRG. TIME OVER (error code: 5010).
In this case, the constant scan setting is ignored and the sequence program is
executed based on its scan time.
Constant scan setting
0 1 2
Constant
scan
0 END
Sequence
program
3.5ms
4ms
Scan where the constant scan is not normal
Diagram 6.3 Operation when the Scan Time is longer than the Constant Scan
If the sequence program scan time is longer than the WDT setting time, the CPU
module detects a WDT error.
In this case, the program execution is stopped.
(WDT Set Time) > (Constant Scan Set Time)
> (Sequence Program maximum Scan Time)
3 4 1 2 3 4
0 END 0
0.5ms
5.3ms
5 1 2 3 4 1
END 0
0.5ms
3.5ms 3.4ms
4ms
2 3 4 ms
END 0
0.6ms
4ms