Jetter JX2-IO16, User Manual

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JX2-IO16 11.4 Dual-channel counter
Jetter AG 87
11.4 Dual-channel counter
Fig. 27: Evaluating a dual-channel counter signal
The dual-channel counter signal is read in via input 5 (K1) and input 6 (K2). The shift
between these two signals is 90°. Depending on the fact which rising edge of these
two signals is detected first, the counter reading is incremented or decremented. The
two signals are subject to quadruple evaluation, i.e. per evaluation cycle the rising
and falling edge of both signals are counted.
Following software filtering, dual-channel signals are directly evaluated. No logical
processing is carried out.
The maximum counting frequency is given in the technical data on the inputs
(for more information refer to chapter "Technical Data of Digital Inputs", page
30).
The dual-channel counter is to be activated via control bit 10 "Counter configuration"
in register 3xx0 "Status / Controller".
Read or write access to the readings of the dual-channel counter is made via register
3xx6 "Dual channel counter - Counter reading", or via register array element 25 "Dual
channel counter - Counter reading". The counter reading can be set to any value by
entering the corresponding number.
Logic processing
Signal 5 & 6 at
the input
terminal
Dual-
channel
counter
Software
filter
No processing
Note!
In case of erronous readings, the software filter setting, as well as the activation
of the dual-channel counter via control bit 10 in register 3xx0 "Status / Controller"
have to checked first.