Chapter 6 FBD Block Diagram Programming 171
(2) Counter Mode 8 (DC powered versions only)
The Mode 8 High Speed Counter can use either input terminals I01 or I02 for forward up-counting to 1 KHz maximum
at 24VDC high speed input signal. The selected Counter Coil (C01-C1F) will turn ON when the pulse count reaches the
target “Preset ON” value and remain ON until the pulse count reaches the target “Preset OFF” value. The counter will
reset when the preceding rung is inactive.
High counting input
→
Counter Parameter
Note: High speed input terminal I01,I02
（
3）High Speed Counter Mode 8 (1KHZ AB phase Input Counter)
Mode 9 is the AB phase high-speed counting function, which counts two pulses with the same periodic pulse width but
a phase difference of 90°. The editing method of AB phase high-speed counting function is the same as that of ordinary
high-speed counting function, but the parameters are different.
In DC models, high speed counter mode 9 counts I01 (A) ahead of I02 (B) for two AB phase high speed input counts of
up to 1kHz. The counter is currently at (0~999999) until the count reaches the preset value, and the output coil is ON
.
Wh
en reset, the current value of the counter is reset to 0, and the output coil is OFF.
As A special coil, M3A marks the counting direction of the AB phase counter. When phase A is ahead of phase B, M3A
is OFF; when phase A is behind phase B, M3A is ON.
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