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•
To restart counting, the internal gate must be reopened. Counting starts again at the load
value.
•
Upon reaching the lower count limit the counter jumps to the upper count limit to continue
counting from there. The status bit Underflow performed is set and a process alarm will be
triggered if it is parameterized. All status bits remain set until they are reset with the bit Reset
status bits in the control word. After a cancelled gate control, the counting process starts with
the load value
Limits
End value
Lower count limit
1-time Counting/ Primary Direction Down
•
If the parametrerized end value +1 is reached during counting in the negative direction, the
counter jumps back to the load value at the next count pulse. The internal gate is
automatically closed, the status bit End value reached is set and a process alarm will be
triggered if it is parameterized.
•
To restart counting, the internal gate must be reopened. Counting starts again at the load
value.
•
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 parameterized. 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
GFK-2958E
Counting Range
Valid range of values
–2 147 483 647 (–2
31
+ 1) to +2 147 483 647 (2
+2 147 483 648 (2
31
)
1-time Counting, Primary Count Down
Counting Range
Valid range of values
–2 147 483 648 (–2
) to +2 147 483 647 (2
31
+2 147 483 647 (2
– 1)
31
RSTi-EP User Manual
Chapter 5 Detailed Descriptions of I/O Modules
31
–1)
–2)
31
191
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