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12 Output Wiring Procedures
115
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
12.2 External Wiring of Transistor Output (Sink/Source) Type
12.2.3 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.
2. 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 must comply with the following specifications.
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.
Item Guide
Reverse voltage 5 to 10 times of the load voltage
Forward current Load current or more
Main unit
Y000
COM0
Load
Fuse
Sink output type
Main unit
Y000
+V0
Load
Fuse
Source output type
Main unit
Y000
COM0
Inductive
load
Fuse
Sink output type
Main unit
Y000
+V0
Inductive
load
Fuse
Source output type
Interlock
PLC output
element
Normal
rotation
Reverse
rotation
Limit of
normal rotation
Limit of
reverse rotation
Sink output type
+
–
Interlock
PLC output
element
Normal
rotation
Reverse
rotation
Limit of
normal rotation
Limit of
reverse rotation
Source output type
–
+