Omron SYSMAC CQM1H Series, Руководство по программированию

Страница: 94 / 602

69
High-speed Counter Board Section 2-1
2-1-7 High-speed Counters 1 to 4
The High-speed Counter Board counts pulse signals entering through ports 1
to 4 from rotary encoders and outputs internal/external output bit patterns
according to the number of pulses counted. The four ports can be used inde-
pendently. An outline of the processing performed by high-speed counters 1
to 4 is provided below.
Overview of Process
Input Signals and Input
Modes High-speed counters 1 to 4 can be set to different Input Modes in response to
the type of signal input.
Differential Phase Mode (Counting Speed: 25 kHz or 250 kHz)
Two phase signals (phase A and phase B) with phase difference multiples of
1x, 2x, or 4x are used together with a phase-Z signal for inputs. The count is
incremented or decremented according to differences in the two phase sig-
nals.
Up/Down Mode (Counting Speed: 50 kHz or 500 kHz)
Phase A is the incrementing pulse and phase B is the decrementing pulse.
The counter increments or decrements according to the pulse that is
detected.
Pulse/Direction Mode (Counting Speed: 50 kHz or 500 kHz)
Phase A is the pulse signal and phase B is the direction signal. The counter
increments when the phase-B signal is ON and decrements when it is OFF.
Phase A Phase B 1x 2x 4x
↑
L Increment Increment Increment
H
↑
--- --- Increment
↓
H --- Increment Increment
L
↓
--- --- Increment
L
↑
--- --- Decrement
↑
H --- Decrement Decrement
H
↓
--- --- Decrement
↓
L Decrement Decrement Decrement
Phase A
Phase B
Differential Phase Mode
1x
2x
4x