5 Function blocks
5.6 C, counter relay
162
Control Relay easy800
11/11 MN04902001Z-EN
www.eaton.com
5.6 C, counter relay
The counter relay (function relay) counts pulses that are received at counter
input C_. The count direction can be set.
You can set a lower and higher limit setpoint as comparison values for the
counter relay function block, as well as a start value.
easy800 device allows the use of up to 32 counter relays.
Contacts and Coils
Example of a counter relay:
Figure 110:Wiring the function block coils
The function block coils are connected to the device inputs.
￫
Counting is carried out cyclically. The time of a pulse must
therefore be greater than twice the cycle time. The CH high-
speed counter can be used for shorter pulses.
￫
Square wave count pulses are required to ensure a 1:1 mark to
space ratio.
The relay counts only in RUN operating mode.
￫
Page 269 on Section “Example with timing relay and counter
function block” provides information on the timing relay and
counter function block.
Contacts
Meaning
C ..OF
Reaching or exceeding the upper limit setpoint
C ..FB
Reaching or falling below the lower limit setpoint
C ..ZE
Actual value at the function block output QV equals zero
C ..CY
Exceeding of the value range
Coils
Function
C ..C
_
counter input, counts with every rising edge
C ..RE
Reset of the counter relay to zero
C ..D
_
Count direction:
0: up counting,
Status 1: down counting.
C ..SE
SET: Transfer of the start value (SV) on a rising edge.
I 05---------------------------
Ä
C 20C
_
I 06---------------------------
Ä
C 20RE
I 07---------------------------
Ä
C 20D
_
I 08---------------------------
Ä
C 20SE
