5 Function blocks
5.8 CH, high-speed counter
Control Relay easy800
11/11 MN04902001Z-EN
www.eaton.com
169
5.8 CH, high-speed counter
All devices with DC inputs apart from EASY802-DC-SWD contain CH function
blocks that enable up and down counting of rising edges independently of
the cycle time.
You can set a lower and higher limit as comparison values for the high-speed
counter function block, as well as a start value.
Four high-speed function blocks are provided.
The maximum count frequency is 5000 Hz.
Contacts and Coils
High-speed counter example
Figure 116:Wiring the function block coils
￫
Square wave count pulses are required to ensure a 1:1 mark to
space ratio.
￫
Note that the digital inputs I1 to I4 are permanently assigned to
the frequency counter function blocks provided:
•
I1: Counter input for counter CH01.
•
I2: Counter input for counter CH02.
•
I3: Counter input for counter CH03.
•
I4: Counter input for counter CH04.
Contacts
Meaning
CH..OF
Reaching or exceeding the upper limit setpoint
CH..FB
Reaching or falling below the lower limit setpoint
CH..ZE
Actual value equals zero
CH..CY
Value range exceeded
Coils
Function
CH..EN
Selective activation of the function block
CH..RE
Reset the actual value to zero
CH..D
_
Count direction
Picked up: up counting,
Not picked up: down counting.
CH..SE
Transfer of the start value on a rising edge.
I 05---------------------------
Ä
CH03EN
I 06---------------------------
Ä
CH03RE
I 07---------------------------
Ä
CH03D_
I 08---------------------------
Ä
CH03SE
