VIPA System 300S SPEED7 CPU 313SC/DPM - Page 108

Chapter 5 Deployment I/O periphery Manual VIPA System 300S SPEED7
5-22 HB140E - CPU SC - RE_313-6CF03 - Rev. 07/45
No main counting direction
• The counter counts forward or backwards starting with the load value.
• At over- or underrun at the count limits, the counter jumps to the
according other count limit and counts from there on.
• The count limits are set to the maximum count range.
Valid value range
Lower count limit -2 147 483 648 (-2
31
)
Upper count limit +2 147 483 647 (2
31
-1)
uppe
r
counter limit
load value
0
gate start
time
counter value
gate stop
lower
counter limit
overflow
underflow
zero-crossing
Main counting direction forward
• The counter counts forward starting with the load value.
• When the counter reaches the end value –1 in positive direction, it
jumps to the load value at the next positive count pulse.
Valid value range
Limit value -2 147 483 647 (-2
31
+1) to +2 147 483 647 (2
31
-1)
Lower count limit -2 147 483 648 (-2
31
)
end value
lower
counter limit
load value
0
gate start
overflow
underflo
w
time
counter value
gate stop
Count
Periodically