FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
217
12 Output Wiring Procedures
12.3 External Wiring of Transistor Output (Sink/Source) Type
11
High-Speed
Counters
12
Output Wiring
13
Wiring for
Various Uses
14
Test Run,
Maintenance,
Troubleshooting
15
IInput/Output
Powered
Extension Units
16
Input/Output
Extension
Blocks
17
Extension
Power Supply
Unit
18
Other Extension
Units and
Options
19
Display Module
20
Terminal Block
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