Delta AS Series Programming Manual page 158

T he PLC r uns .
SM400
SM401
SM402
SM403
11. The initial clock pulse
 SM404，SM405，SM406，SM407
The PLC provides seven types of clock pulses. When the PLC is powered on, the seven types of clock pulses act
automatically.
Device
10 millisecond clock pulse during which the pulse is ON for 5 milliseconds and then is OFF for 5
SM404
milliseconds
100 millisecond clock pulse during which the pulse is ON for 50 milliseconds and then is OFF for 50
SM405
milliseconds
200 millisecond clock pulse during which the pulse is ON for 100 milliseconds and then is OFF for 100
SM406
milliseconds
One second clock pulse during which the pulse is ON for 500 milliseconds and then is OFF for 500
SM407
milliseconds
The clock pulses are illustrated in the following graphs.
10 ms
SM404 (10 ms)
5 ms
100 ms
SM405 (100 ms)
50 ms
200 ms
SM406 (200 ms)
100 ms
1 sec
SM407 (1 sec)
500 ms
Scan ti me
Function
100 Hz
10 Hz
5 Hz
1 Hz
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