YASKAWA CPU 013C Manual page 118

Deployment I/O periphery
Counting > Counter operating modes
5.6.6.2.3 Main counting direction backward
118
n The counter counts backward starting with the load value.
n When the counter reaches the End value +1 in positive direction, it jumps to the load
value at the next count pulse and the gate is automatically closed. If enabled addition-
ally a hardware interrupt is triggered.
To restart the count process, you have to generate an edge 0-1 at the gate
n
5.6.7.2 'Gate function' on page 122. The counter counts starting with the load value.
n You may exceed the upper count limit.
Limits
End value
Upper count limit
Valid range of values
31
-2 147 483 648 (-2 )
up to +2 147 483 646 (2
+2 147 483 647 (2 31 -1)
HB300 | CPU | 013-CCF0R00 | en | 16-40
VIPA System SLIO
Ä Chapter
31 -2)