5 Function blocks
5.8 CH, high-speed counter
172
Control Relay easy800
11/11 MN04902001Z-EN
www.eaton.com
Function of the function block
Figure 118:Signal diagram of high-speed counter
1: Counter input I1 to I4.
2: Upper setpoint value >SH
3: Start value >SV.
4: Lower setpoint value >SL.
5: Count direction, coil CH…D
6: Transfer start value, coil CH..SE.
7: Reset coil CH…RE
8: Contact (N/O) CH…OF: Upper setpoint value reached or exceeded.
9: Contact (N/O) CH…FB: Lower setpoint value reached or undershot.
10: Contact (N/O) CH…ZE: Actual value equal to zero
11:Out of value range.
• Range A:
– The counter has the value zero.
– The contacts CH..ZE (actual value = zero) and CH..FB (lower setpoint value undershot) are active.
– The counter receives pulses and increases the actual value.
– CH..ZE as well as CH..FB drop out when the lower setpoint value is reached.
• Range B:
– The counter counts upwards and reaches the upper setpoint value.
The contact “upper setpoint value” CH…OF becomes active.
• Range C:
– The coil CH..SE is briefly actuated and the actual value is set to the start value.
The contacts go to the respective position.
1
2
.........
.........
3
4
6
7
8
9
10
11
A
B
C
D
E
F
5
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