Mitsubishi FX3U Series User Manual

216
FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
12 Output Wiring Procedures
12.3 External Wiring of Transistor Output (Sink/Source) Type
12.3.4 External wiring precautions
1. Protection circuit for load short-circuits
A short-circuit at a load connected to an output terminal could cause burnout at the output element or the
PCB. To prevent this, a protection fuse should be inserted at the output.
Use a load power supply capacity that is at least 2 times larger than the total rated fuse capacity.
• External Wiring of Sink Output Type
• External Wiring of Source Output Type
2. Interlock
For loads such as forward/reverse contactors, etc., where a hazardous condition could result if switched ON
simultaneously, an external interlock should be provided for interlocking the PLC’s internal programs, as
shown to the right.
• External Wiring of Sink Output Type
• External Wiring of Source Output Type
PLC
Y
COM1
Load
Fuse
PLC
Y
+V0
Load
Fuse
Limit of normal
rotation
Interlock
Limit of reverse
rotation
PLC output
element
Limit of normal
rotation
Interlock
Limit of reverse
rotation
PLC output
element

Mitsubishi FX3U Series Specifications

General

Brand	Mitsubishi
Model	FX3U Series
Category	Controller
Language	English