Chapter 4 Installing Hardware and Wiring
4-103
4.13.3.3 Transistor Output Circuit
Direct-current power supply
The output terminals of a transistor module are open-collector output terminals. If Y0.8 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.
A relay or a solenoid valve is used as a DC load. A diode is connected in parallel to absorb the surge
voltage which occurs when the load is OFF.
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.
Y0.9 can not be connected to a power supply directly. It must be connected to a load.
Transistor output
Load
Trigger circuit
Y0.8
LED
C0
AH04HC-5A
< 0.5A
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