Mitsubishi 00JCPU - Page 70

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<<When a constant scan time value is set>>
The following timing charts show the CPU module operation when low-speed execution type programs are executed
under the conditions given below.
• Constant scan time value : 8ms
• Total execution time of scan execution type programs : 4 to 5ms
• Execution time of the low-speed execution type program A : 1ms
• Execution time of the low-speed execution type program B : 3ms
• END processing/low-speed END processing : 0ms (assumed to be 0ms for easy understanding)
Figure 2.27 Asynchronous mode (SM330: off)
Figure 2.28 Synchronous mode (SM330: on)
0.5ms
2.5ms
0.5ms
(13ms) (8.5ms) (8.5ms)
Scan execution type
program
Low-speed execution
type program A
Low-speed execution
type program B
Waiting time in
constant scan
Low-speed
scan time
Low-speed
scan time
Low-speed
scan time
Low-speed END
processing
Low-speed END
processing
Low-speed END
processing
0.5ms
1ms
2ms
0 8 16 24 32
(ms)
4.5ms 4ms 4ms4ms
1.5ms1.5ms
1ms
1ms
0.5ms
0.5ms
5ms
0.5ms
1ms1ms
END processing END processing END processing END processing
0 8 16 24 32
(ms)
1ms
4.5ms 4ms 4ms 5ms4ms
0.5ms
2.5ms
0.5ms
3ms
1ms
2.5ms
0.5ms
0.5ms
3.5ms
(13ms) (15.5ms)
Scan execution type
program
Low-speed execution
type program A
Low-speed execution
type program B
Waiting time in
constant scan
Low-speed scan time Low-speed scan time
Low-speed END
processing
Low-speed END
processing
END processing END processing END processing END processing