Mitsubishi 00JCPU User Manual page 70

<<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)
Scan execution type
program
Low-speed execution
type program A
Low-speed execution
type program B
Waiting time in
constant scan
Scan execution type
program
Low-speed execution
type program A
Low-speed execution
type program B
Waiting time in
constant scan
2 - 25
END processing END processing
0 8
4ms 4.5ms
1ms
2.5ms
0.5ms
0.5ms
Low-speed
scan time
(13ms)
Low-speed END
processing
Figure 2.27 Asynchronous mode (SM330: off)
END processing END processing
0 8
4ms 4.5ms
1ms
2.5ms
0.5ms
Low-speed scan time
(13ms)
Low-speed END
processing
Figure 2.28 Synchronous mode (SM330: on)
END processing
16
4ms
1ms 1ms
1.5ms 1.5ms 1ms
0.5ms
Low-speed
scan time
(8.5ms)
Low-speed END
processing
END processing
16
4ms
1ms
0.5ms
2.5ms
3ms
Low-speed scan time
(15.5ms)
END processing
(ms)
24 32
4ms 5ms
1ms
2ms 0.5ms
0.5ms 0.5ms
Low-speed
scan time
(8.5ms)
Low-speed END
processing
END processing
(ms)
24 32
4ms 5ms
0.5ms
0.5ms
3.5ms
Low-speed END
processing