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Operating modes and functions
5.3 Counting
Controlling the counting process
HW gate = closed
HW gate = open
5.3.2
Counter in operation (startup and stop)
The following behavior applies to the configured CFU with assigned parameters.
Start
The counter starts at 0 after the following events:
● Startup of the CFU
● Count value exceeds the high counting limit
● Restart of the CPU (STOP -> RUN)
● CPU/CFU connection is restored
Stop
The count value is frozen after the following events:
● Internal gate closed
● CPU in STOP
● CPU/CFU connection is terminated (for example, PN cable disconnected)
Behavior of the counter during operation
Figure 5-2
40
SW gate = closed SW gate = open
Internal gate
closed; counting
process stopped
Internal gate
closed; counting
process stopped
Example: Counting process with gate control (without influencing the count value)
Internal gate closed; counting process stopped
The internal gate is open. The pulses are detected by the
counter.
The behavior when the high counting limit is violated de‐
pends on the setting of the "Reaction to violation of the high
counting limit (Page 41)" parameter).
Commissioning Manual, 08/2019, A5E39252870-AD
SIMATIC CFU
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