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12 Output Wiring Procedures
12.1 External Wiring for Relay Output Type
175
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
11
High-Speed
Counters
12
Output Wiring
13
Wiring for
Various Uses
14
Test Run,
Maintenance,
Troubleshooting
15
Input/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
12.1.3 External wiring precautions
1. Protection circuit for load short-circuiting
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.
2. Contact protection circuit for inductive loads
An internal protection circuit for the relays is not provided for the relay output circuit in this product. It is
recommended to use inductive loads with built-in protection circuits. When using loads without built-in
protection circuits, insert an external contact protection circuit, etc. to reduce noise and extend the product
life.
1) DC circuit
Connect a diode in parallel with the load.
The diode (for commutation) must comply with the following
specifications.
2) AC circuit
Connect the surge absorber (combined CR components such as a surge killer and spark killer, etc.)
parallel to the load.
Select the rated voltage of a surge absorber that is suitable
for the load being used. Refer to the table below for other
specifications.
Reference
3. 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.
4. In-phase
PLC output contacts (*) should be used in an "in-phase"
manner.
Item Guide
Reverse voltage 5 to 10 times the load voltage
Forward current Load current or more
Item Standard
Static electricity capacity
Approx. 0.1 F
Resistance value
Approx. 100 to 200
Manufacturer Model name Manufacturer Model name
Okaya Electric Industries Co., Ltd. CR-10201 Rubycon Corporation 250MCRA104100M B0325
PLC
COM1
Load
Fuse
Y 0
Inductive load
PLC output
contact
Diode
(for commutation)
Inductive load
Surge
absorber
PLC output
contact
Inter-
lock
PLC output
contact
PLC output
contact
Limit of normal
rotation
Limit of reverse
rotation
Normal
rotation
Reverse
rotation
*
Bad
Good
*
*
*