High Speed Count Input; Count Mode - Xinje XS Series User Manual

5-3. High speed count input

XSDH/XS3/XSLH series PLC has a high-speed counting function independent of the scanning cycle of the
programmable controller. By selecting different counters, it can measure the high-speed input signals such as
the measurement sensor and rotary encoder. The maximum measurement frequency of XS3 can reach 200kHz.
The high-speed counting input of XS3 series PLC can only receive differential signal (DIFF) and cannot receive
open collector signal. Please be sure to select the encoder of differential signal (DIFF).
When the counting frequency is higher than 25Hz, please select the high-speed counter.
5-3-1．Count mode
XSDH/XS3/XSLH series high-speed counting function has two counting modes, namely, incremental mode and
AB phase mode.
(1) Incremental mode
In this mode, the input pulse signal is counted, and the count value increases with the rising edge of each pulse
signal.
(2) AB phase mode
In this mode, the high-speed count value is incremented or decremented according to two differential signals
(phase A and phase B), and the counting mode is quadruple frequency mode.
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