GE RSTi-EP - Page 177

Chapter 5 Detailed Descriptions of I/O Modules
GFK-2958E RSTi-EP User Manual 173
Periodic Counting/ Primary Counting Direction Up
Periodic Counting, Primary Counting Direction Up
• Up-counting starts at the load value.
• If the parameterized end value -1 is reached during counting in the positive direction, the
counter jumps back to the load value at the next positive 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 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.
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
)