Chapter 8 Built-in High-speed Counter Function
8-4
8.1.3 Counter Function
(1) Counter mode
(a) High Speed counter module can count High Speed pulses which can not be processed by CPU
module’s counter Function Block (CTU, CTD, CTUD, etc.), up to binary value of 32 bits (-
2,147,483,648 ~ 2,147,483,647).
(b) Available input is 1-phase input, 2-phase input and CW/ CCW input.
(c) Count increasing/decreasing methods are as follows;
1) For 1-phase input: a) Increasing/decreasing count operation by program setting
b) Increasing/decreasing count operation by B-phase input signal
2) For 2-phase input: setting by difference in phase between A-phase and B-phase
3) For CW/CCW input: Increasing operation if B-phase is LOW with A-phase input, and Decreasing
operation if A-phase is LOW with B-phase input.
(d) Auxiliary modes are as follows;
1) Count Latch
2) Count function about the number of revolution per unit time
(e) Pulse input mode
1) 1 phase count mode
a) Increasing/decreasing count operation by program setting
● 1-phase 1-input 1-multiplication operation mode
A-phase input pulse counts at rising and increasing/decreasing will be decided by the
applicable program.
Increasing/Decreasing classification
rising
falling
Increasing/decreasing count setting signal Off
Increasing/decreasing count setting signal On
● Operation example
b) Increasing/decreasing count operation by B-phase input signal
● 1-phase 2-input 1-multiplication operation mode
A-phase input pulse counts at rising and increasing/decreasing will be decided by B-phase.
Increasing/Decreasing classification
A-phase input pulse
rising
A-phase input pulse
falling
B-phase input pulse Off Increasing count -
B-phase input pulse On Decreasing count -
Decreasing
Increasing/Decreasing
count setting signal
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