Eaton PROFIBUS-DP EZ204-DP User Manual Page 132

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Wiring with EZ
MN05013003E128
High-speed counter
You can use the high-speed counters to count high frequency
signals reliably.
EZ provides two high-speed up/down counters C13 and C14
for use as required. The high-speed counter inputs are
permanently connected to the digital inputs I1 and I2. These
counter relays allow you to count events independently of the
cycle time.
The high-speed counters allow you to enter an upper
threshold value as a comparison value. The C13 and C14
high-speed counters are not dependent on the cycle time.
Counter frequency and pulse shape
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.
t
min
= minimum time of the pulse or pause duration
f
max
= maximum count frequency (1 kHz)
Wiring of a high-speed counter
The following assignment of the digital inputs apply.
I1: high-speed counter input for counter C13.
I2: high-speed counter input for counter C14.
t
min
= 0.5 ×.
1
f
max
J
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.
EZ500_700.book Page 128 Tuesday, May 3, 2005 5:15 PM
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