Siemens Simatic CFU User Manual

Controlling the counting process
SW gate = closed SW gate = open
HW gate = closed Internal gate
closed; counting
process stopped
Internal gate closed; counting process stopped
HW gate = open 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).
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
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/RZFRXQWLQJOLPLW
7LPH
*DWHRSHQ*DWHFORVHG&RXQWHUHYHQW*DWHRSHQ
Figure 5-2 Example: Counting process with gate control (without influencing the count value)
Operating modes and functions
5.3 Counting
SIMATIC CFU
40 Commissioning Manual, 08/2019, A5E39252870-AD

Siemens Simatic CFU Specifications

General

Brand	Siemens
Model	Simatic CFU
Category	I/O Systems
Language	English