Displacement Sensor (Pulse); Displacement Sensor (Pulse) Counting Method - KYOWA WP-120A Instructions For Use Manual

3. Making connections

3-3-2. Displacement sensor (pulse)

Connect a differential square wave output type displacement
sensor.
This unit internally converts differential output signals from
sensors (RS422 level) to TTL level.
o The +5V power supply of pin 17 can be used as a power
supply of up to 150 mA (maximum) for a displacement
sensor (pulse).
ATTENTION
Prepare a separate power supply if the displacement sensor
cannot use a +5V power supply or requires more than 150 mA.
Connection example
Displacement sensor
+
A phase
–
+
B phase
–
Power
+5V
supply
COM(GND)
F.G
*CONTROL connector 21–24 (see page 24)
Terminal
number
SHIELD
13
+5V OUT
17
18 GND
Differential pulse displacement sensor B phase +
21
22 Differential pulse displacement sensor B phase −
Differential pulse displacement sensor A phase +
23
Differential pulse displacement sensor A phase –
24
3-3-3. Displacement sensor (pulse)
counting method
The WP-120A has modes that support A phase only and AB
phase (2-phase) output signals from displacement sensors
(pulse).
The count value changes as shown below for A phase only and
AB phase output.
NOTE
HI: Input is OFF
LO: Input is ON
: Changing from HI to LO
: Changing from LO to HI
22
WP-120A
A phase (+)*
A phase (−)*
B phase (+)*
B phase (−)*
+5V OUT
GND
SHIELD
Signal
When output phase A
A phase
Count
Up count
Up counts occur when the A phase input pulse signal is ON (at
the falling edge).
When output phase AB
A phase
B phase
Count
Up
count
Count operations
A phase input B phase input Count operation
LO
HI
HI
LO
HI
LO
LO
HI
Counts occur at both the rising and falling edges of A and B
phase input pulses.
See "Count operations" above for whether the count is up or
down.
Time
Down
count
Time
Up count
Down count