6. Function blocks
6.1 Manufacturer function blocks
6.1.2 Counter Function Blocks
6.1.2.1 C - Counter relay
This counter relay function block counts pulses that are received at counter input C_.
The count direction can be set.
Counting is carried out cyclically. The time of a pulse must therefore be
greater than twice the cycle time.
For shorter pulses, use the CH - High-speed counter function block →
page 316.
You can set a lower and higher limit setpoint as comparison values for the counter
relay function block, as well as a start value.
General
easyE4 base devices provide 32 counter relays, C01 through
C32. Each counter relay can count up and down and func-
tions as a double word counter.
Operating principle
The contacts will switch according to the actual value. The appropriate function
block outputs switch according to the actual value determined. You can set a starting
value using input SV.
The counter relays C01…C32 are cycle time dependent.
The following applies to the EDP programming language:
The time for a single count pulse must be longer than twice
the cycle time. For shorter pulses, use the CH high-speed
counter function block.
NOTICE
Avoid unforeseeable switching states.
Switch C, CF, CH, CI function blocks only at one single point in the pro-
gram.
Otherwise, previous counts will be overwritten.
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