Product Overview
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High Speed Counter Encoder Module User Manual
1.6 24-Bit Counters Quadrature Mode Outputs
You
can select one of four output options, (see Figure 1-9) for the output
signal of each 24-bit counter (Counter 1, Output 1; and Counter 4, Output
5).
In quadrature counting modes, the internal clocking for the Compare, Carry
and Borrow pulses produce a pulse width insufficient to drive the outputs.
See Figure 1-9. Compare Toggle and Compare Latch are the only signals
that can drive the output circuitry
.
The Carry T
oggle output changes state when the count overflows. After a
counter reset, the Carry T
oggle output is on. Set the output jumper to
Compare.
The Borrow T
oggle output changes state when the count underflows. After a
counter reset, the Borrow T
oggle output is on. Set the output jumper to
Compare T
oggle.
In all module counting modes, the PLC can read the Compare T
oggle, Carry
T
oggle and Borrow Toggle flags in Status Word WX17. T
able 1-1 and
T
able 1-2 summarize the active outputs for various counter modes.
The Compare T
oggle jumper selects a signal that changes state on the next
count after the count value equals the preset value. This signal appears on
Output 1 (Channel 1) or on Output 5 (Channel 2). After counter reset, the
output signal is on.
The Compare Latch jumper selects a signal that is active when the count
value equals the preset value; the signal remains active until reset by the
PLC or by the second preset (Preset 2 or Preset 6). This signal appears on
Output 1 (Channel 1) or on Output 5 (Channel 2). After counter reset, the
output signal is Off.
Outputs in
Quadrature
Modes
Carry T
oggle
Output
Borr
ow T
oggle
Output
Compar
e T
oggle
Output
Compar
e Latch
Output
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