Chapter 4 Installing Hardware
4-47
④
Using surge absorbing diodes to extend the lifespan of contacts
A diode is connected in parallel to absorb the surge voltage: used in low-power situations
+
Y
C0
D
I/O relay output
Low p ower
D: 1N4001 Diode or its equivalent
VDC
A diode and Zener are connected in parallel to absorb the surge voltage: used in high-power and
power-on/off frequently situations.
VDC
+
Y
C0
I/O relay output
H igh power a nd
ON/OFF frequently
ZD 9V Zener, 5W
⑤
A bulb (incandescent lamp) is used as a resistive load.
⑥
Alternating-current power supply
⑦
Mutually exclusive output: For example, using Y3 and Y4 to control the forward and reverse rotation
of the corresponding motor, creating an interlock in the external circuit. Combined with the PLC
internal program, this ensures that there are safety measures in place for any abnormal or sudden
situations.
○8
Surge absorber: noises can be reduced on AC loads.
AC loads
Y
C1
I/O relay output
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