Emerson PACSystems RSTi-EP User Manual page 208

User Manual
GFK-2958J
Via bit QX8.5 or QX10.5 respectively of the control word you can load a set value into the
counting value. You can define the set value in the module parameters.
Counting Direction
No Primary Direction
The entire counting range is available when using a counting mode without primary
direction.
Primary Direction Up
The counting range is limited at the top by a parameterized end value. Starting from 0, a set
value or a parameterized load value, the counter counts until the end value -1 and is reset
to the load value with the next encoder pulse.
Primary Direction Down
The counting range is limited at the bottom by a parameterized end value. Starting from 0,
a set value or a parameterized load value, the counter counts until the end value +1 and is
reset to the load value with the next encoder pulse.
Gate Function Activate / Deactivate Counter
The counter is activated and deactivated using an internal gate. The internal gate is identical
to the software gate (SW gate), it is activated using a 0-1 edge at the bit Set SW gate in the
control word and deactivated with a 0-1 edge at the bit Reset SW gate in the control word
(see table Process data outputs).
Counting Behavior: Interrupt/ Cancel Counting
You can parameterize the counting behavior after a new gate start: Using "Interrupt
counting", the counter continues from the last counting value. Using "Cancel counting",
counting starts again from the load value.
Endless Counting
Figure 111: Continuous Counting
Detailed Description of I/O Modules
Chapter 5
Oct 2019
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