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4 Wiring with
4.6 High-speed counters, -DA, -DC
4.6.2.1 Counter frequency and pulse shape
4.6.2.2 Wiring of a high-speed counter
----------CC13
C13-------SN3
I6--------DC13
I8-C13----RC13
104
The maximum counter frequency is 1 kHz.
The signals must be square waves. We recommend a mark-to-space ratio of
1:1.
If this is not the case:
The minimum mark-to-space ratio is 0.5 ms.
1
t
= 0.5 x
min
f
max
t
= minimum time of the pulse or pause duration
min
f
= maximum count frequency (1 kHz)
max
￫
High-speed counters operate independently of the program
cycle time. The result of the actual value setpoint comparison is
only transferred once every program cycle for processing in the
circuit diagram.
The reaction time in relation to the setpoint/actual value
comparison can therefore be up to one cycle in length.
The following assignment of the digital inputs apply.
•
I1: high-speed counter input for counter C13.
•
I2: high-speed counter input for counter C14.
￫
If you use C13 or C14 as high-speed counters you must enable
them with the coil CC13 or CC14 accordingly.
You integrate a high-speed counter into your circuit in the form of a contact and
coil.
The coils and contacts have the following meanings:
.
Contact
Coil
-
C13
C14
,
CC13
CC14
,
DC13
DC14
,
RC13
RC14
￫
The high-speed counter can also be enabled specifically for a
special operating state. This has the advantage that the cycle
time of the device is only burdened with the counting when it is
taking place. If the high-speed counter is not enabled, the cycle
time of the device is shorter.
Operating instructions 05/10 MN05013003Z-EN www.eaton.com
The contact switches if the actual value is greater than or equal to the setpoint.
Enable of the high-speed counter on 1 signal coil activated
Counting direction
• Status 0, not activated, up counting.
• Status 1, activated, down counting.
Reset, coil triggered: actual value reset to 00000
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