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4. SPECIFICATION
PL21
Resolution 10 µm/20 µm/50 µm/100 µm
Note 1
(See P.19)
Minimum phase difference (Tw)
PL21-3F, AF: 2.5 µs/5 µs/10 µs/20 µs (−0.9 µs
Note 2
)
Minimum repeat cycle (Tw)
PL21-3U, AU: 2.5 µs/5 µs/10 µs/20 µs (+0.9 µs
Note 2
)
Output signal
Note 3
PL21-3F, AF
A
B
(ON)
(OFF)
(OFF)
(ON)
PL21-3U, AU
Alarm signal If the scale exceeds the maximum responce speed
or if a head cable connection becomes open, an
alarm is triggered.
The alarm output is ON during normal operation and
it is turned OFF when the alarm is triggerd. The
alarm can be reset by turning the power back on.
Output circuit
Open collector
Maximum rated voltage: 25 V
Maximum rated current: 50 mA
Power requirements
DC +12 V (±5%)
Power consumption
0.8 W (Max.)
Operating temperature range
0 to +45 °C/32 to 113 °F
Storage temperature range
−10 to +50 °C/14 to 122 °F
Head cable length
10 m (PL21-AF, AU), 3 m (PL21-3F, 3U)
Total weight PL21-AF, AU: 1030 g / 2.318 sb
PL21-3F, 3U: 620 g / 1.395 sb
Accessories Head installation screws (M4×20) ............... 2 pcs.
Detector installation screws (M4×10) .......... 4 pcs.
Cable clamp screws (M4×12) ...................... 3 pcs.
Techinical Information ................................... 1 pc.
Output connector ........................................... 1 set
Instruction manual ......................................... 1 pc.
Cable clamps ............................................... 3 pcs.
Spacer ............................................................ 1 pc.
Note 1
The PL21-3U, AU is always receive Up/Down output with the Up/Down counter. Accurate
measurement cannot be obtained if only one output is used.
Note 2
This value differs depending on connection cable length and connected circuits.
Note 3
The displacement is detected about every 100 µs to generate pulses corresponding to the
displacement of the scale or head.
As the A/B output or Up/Down output signal, unlike common rotary encoder, is artificially
generated, it is sometimes output at the present pulse width (Tw) even when the scale
movement is slow. It is necessary to use a receiving circuit that can receive the present
pulse width.
A, B, ALARM
UP, DOWN
UP
DOWN
(ON)
(OFF)
(ON)
(OFF)
UP
DOWN
(ON)
(OFF)
(ON)
(OFF)
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