Delta AS Series Operation Manual page 220

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4.8.2.3 Transistor Output Circuit (NPN)
D : 1N4001 di ode
①
Direct-current power supply
②
Emergency stop
③
Fuse
The output terminals of a transistor module are open-collector output terminals. If Y0.0/Y0.1 is a pulse
train output terminal of a transistor module, the output current passing through its output pull-up resistor
must be greater than 0.1 A to ensure that the transistor module operates normally.
④
1. A diode is connected in parallel to absorb the surge voltage: used in low-power situations (refer to
Figure 1).
2. A diode and Zener are connected in parallel to absorb the surge voltage: used in high-power and
power-on/off frequently situations (refer to Figure 2).
⑤ A bulb (incandescent lamp) is used as a DC load. A thermistor is connected in series to absorb the
surge current which occurs when the load is ON.
Mutually exclusive output: For example, Y0.2 controls the clockwise rotation of the motor, and Y0.3
⑥
controls the counterclockwise rotation of the motor. This interlock circuit and the program in the PLC
ensure that there are protective measures if an abnormal condition occurs.
⑦ Connected to a NTC thermistor (negative temperature coefficient), when a bulb (incandescent lamp) is
used as a DC load and a thermistor is connected in series to absorb the surge current.
-
Low p owe r
+
Y
D
VDC
C
[ Figu re 1 ]
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High powe r -
Fre qu en tl y ON OF F
Y
ZD D
C
D: 1N 4001 d io de
ZD : 9V Zen er, 5W
[ F ig ur e 2 ]
/
+
VDC