User Manual
Section 5
GFK-2958L
May 2021
Detailed Description of I/O Modules
221
Counting Range
Limits
Valid range of values
End 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
)
Periodic Counting/ Primary Direction Down
Figure 116: Periodic Counting, Primary Counting Direction Down
•
Down-counting starts at the load value.
•
If the parameterized 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 parameterized. All status bits remain set until they are reset
with the bit Reset status bits in the control word.
Counting Range
Limits
Valid range of values
End value
–
2 147 483 647 (
–
2
31
) to +2 147 483 646 (2
31
–
2)
Upper count limit
+2 147 483 648 (2
31
-1)
