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Limits
End value
Lower count limit
Periodic Counting/ Primary Direction Down
•
Down-counting starts at the load value.
•
If the parameterised end value +1 is reached during counting in the negative direction, the
counter jumps back to the load value at the next count pulse and continues counting from
there. The status bit End value reached is set and a process alarm will be triggered if it is
parameterized.
•
Upon reaching the upper count limit the counter jumps to the lower count limit to continue
counting from there. The status bit Overflow performed is set and a process alarm will be
triggered if it is parameterised. All status bits remain set until they are reset with the bit Reset
status bits in the control word.
Limits
End value
Upper count limit
5.15.3 Additional Counter Features
You can define the additional features for the counter listed below by parametrising or via the
process data outputs:
•
Reset: resets the counting value to the load value during counting.
•
Comparator: Upon meeting the comparison condition, the comparison bit is activated or a
process alarm is triggered.
•
Hysteresis: reduces frequent toggling of the comparison bit and/or excessive triggering of a
process alarm, e.g. when the value of a sensor signal fluctuates around the comparison
value. It is possible to count beyond the lower count limit.
GFK-2958E
Counting Range
Valid range of values
–2 147 483 647 (–2
+2 147 483 648 (–2
Periodic Counting, Primary Direction Down
Counting Range
Valid range of values
–2 147 483 647 (–2
+2 147 483 647 (–2
RSTi-EP User Manual
Chapter 5 Detailed Descriptions of I/O Modules
31
+ 1) to +2 147 483 647 (2
31
31
)
31
) to +2 147 483 647 (2
31
–1)
–1)
31
–1)
193
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