104
6 WIRING
6.6 Output Wiring
■
Output current
Maximum load differs for each module. For specifications of each module, refer to the following.
For output specifications of the CPU module, refer to
Page 31 Output Specifications.
For output specifications of the I/O modules, refer to
Page 152 Output specifications.
For output specifications of the terminal modules, refer to
Page 170 Output specifications.
When driving a semiconductor device, carefully check the input voltage characteristics of the device.
■
Open circuit leakage current
0.1 mA or less
Wiring precautions
■
Protection circuit for load short-circuiting
A short-circuit at a load connected to an output terminal could cause burnout at the output device 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 load current.
■
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.
■
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 along with an interlock in the PLC program, as shown below.
Standard
Reverse voltage
5 to 10 times as high as the load voltage
Forward current
Load current or larger
PLCs
Y
COM0
Load
Fuse
Sink output type
Y
+V0
PLCs
Load
Fuse
Source output type
PLCs
Inductive load
Fuse
Sink output type
Y
COM0
PLCs
Inductive load
Fuse
Source output type
Y
+V0
+
-
Forward rotation
Reverse rotation
Sink output type
Interlock
PLC output
element
Limit of forward
rotation
Limit of reverse
rotation
-
+
Forward rotation
Reverse rotation
Source output type
Interlock
PLC output
element
Limit of forward
rotation
Limit of reverse
rotation
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