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12 Output Wiring Procedures
111
FX3S Series Programmable Controllers
User's Manual - Hardware Edition
11
Built-in Analog
12
Output Wiring
13
Wiring for
Various Uses
14
Test Run,
Maintenance,
Troubleshooting
15
Other Extension
Units and
Options
16
Display Module
(FX
3S
-5DM)
17
Memory
Cassette
A
Special Devices
(M8000-, D8000-)
B
Instruction List
C
Discontinued
models
12.1 External Wiring for Relay Output Type
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 Guide
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
Load
Fuse
Y001
COM1
Main unit
+
-
Inductive load
PLC output
contact
Diode
(for commutation)
Inductive load
PLC output
contact
Surge
absorber
Interlock
PLC output
contact
PLC output
contact
Limit of
normal
rotation
Limit of
reverse
rotation
Normal
rotation
Reverse
rotation
*
*
*
*
Bad
Good