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FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
12 Output Wiring Procedures
12.3 External Wiring of Transistor Output (Sink/Source) Type
3. Contact protection circuit for inductive loads
When an inductive load is connected, connect a diode (for commutation) in parallel with the load as
necessary.
The diode (for commutation) must comply with the following specifications.
• External Wiring of Sink Output Type
• External Wiring of Source Output Type
Item Guide
Reverse voltage 5 to 10 times of the load voltage
Forward current Load current or more
PLC
Y
COM1
Inductive
load
Fuse
PLC
Y
+V0
Inductive
load
Fuse