Delta AH500 - Page 107

AH500 Programming Manual
2-88
10. The initial clock pulse
 SM404~SM410, and SR409~SR410
The PLC provides seven types of clock pulses. When the PLC is supplied with power, the
seven types of clock pulses act automatically. Users can set the interval of the clock pulse in
SM409 and SM410.
Device
Function
SM404
10 millisecond clock pulse during which the pulse is ON for 5 milliseconds and is
OFF for 5 milliseconds
SM405
100 millisecond clock pulse during which the pulse is ON for 50 milliseconds
and is OFF for 50 milliseconds
SM406
200 millisecond clock pulse during which the pulse is ON for 100 milliseconds
and is OFF for 100 milliseconds
SM407
One second clock pulse during which the pulse is ON for 500 milliseconds and
is OFF for 500 milliseconds
SM408
Two second clock pulse during which the pulse is ON for one second and is
OFF for one second
SM409
2n second clock pulse during which the pulse is ON for n seconds and is OFF
for n seconds
The interval n is specified by SR409.
SM410
2n millisecond clock pulse during which the pulse is ON for n milliseconds and is
OFF for n milliseconds
The interval n is specified by SR410.
The clock pulses are illustrated as follows.
SM404 (10 ms)
SM405 (100 ms)
SM406 (200 ms)
SM407 (1 sec)
1 Hz
5 Hz
10 Hz
500 ms
100 Hz
100 ms
50 ms
5 ms
1 sec
200 ms
100 ms
10 ms