6. Function blocks
6.1 Manufacturer function blocks
6.1.2.4 CI - Incremental counter
General information
easyE4 base devices provide 2 high-speed incremental encoder
counters, CI01 through CI02. The high-speed up and down coun-
ters are internally hardwired with the digital inputs I01...I02 or
I03...I04 and operate independently of the cycle time.
Operating principle
Incremental counters interpret rising and falling edges in order to identify the count dir-
ection. The count will be in the direction of the rising and falling edges.
The counter wiring must observe the following digital device input assignment:
I01 Counter input for the counter CI01 channel A.
I02 Counter input for counter CI01 channel B
I03 Counter input for counter CI02 channel A
I04 Counter input for counter CI02 channel B
The contacts will switch according to the actual value. The appropriate function block
outputs switch according to the actual value determined. The counter relays enable a
preset start value to be defined at the SV input.
Only square wave signals are permissible.
The mark-to-space ratio is 1:1.
The signals of channels A and B must be offset by 90°. Otherwise the count direction
cannot be determined.
Positive count direction
If the rising edge at channel A is detected before the rising edge at channel B, the
counter will count up. This means that the counter will be incremented by 1 after there
is a rising edge at channel A followed by a rising edge at channel B. The same applies to
the falling edges in sequence at channel A and channel B. The counter relay's result will
be incremented and output at output QV.
Figure 134: CI function block counting up; QV=QV+4
easyE4 11/18 MN050009 EN www.eaton.com
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