Periodic Upward Counting; Periodic Downward Counting - Siemens Metro 21 M216KA Operator's Manual

The 1COUNT40kHz Counter Module
Periodic Counting
13-6
The counter begins at the loaded value.
In periodic counting, the counter starts at the loaded value. If the counter
reaches the upper value when counting upward and there is then another
count pulse, the counter jumps to the loaded value and starts to count the
count pulses again.
If the counter reaches the lower count limit when counting downward and
there is then another count pulse, the counter jumps to the loaded value and
continues to count downward from there.
Counter status
Upper count limit
Loaded value
Lower count limit
Figure 13-8 Periodic Upward Counting
Counter status
Upper count limit
Loaded value
Lower count limit
Figure 13-9 Periodic Downward Counting
ET 200L, ET 200L-SC and ET 200L-SC IM-SC Distributed I/O Device
Time
Time
EWA 4NEB 780 6009-02c