Delta AS Series Programming Manual page 1210

Additional remarks
1.
The alignment mark function and mask function:
 When DDRVM is executed, the pulse output starts.
 When the interrupt occurs for the mark alignment, the ramp-down process starts and the output stops after the
number of the pulses specified by S
 When the interrupt for the mark alignment does not occur or has no effect, DDRVM stops outputting the pulses
after the target number of pulses specified by S
S : The number of output pulses in the fore mask section. If the interrupt occurs in this section, the interrupt is
4
ineffective for the mark alignment.
S : The number of output pulses in the rear mask section. If the interrupt occurs in this section, the interrupt is
5
ineffective for the mark alignment.
S : The target output frequency
2
.
6
.
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