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Wiring Section 5-3
5-3-2 Wiring CJ-series Basic I/O Units with Terminal Blocks
I/O Unit Specifications Double-check the specifications for the I/O Units. In particular, do not apply a
voltage that exceeds the input voltage for Input Units or the maximum switch-
ing capacity for Output Units. Doing so may result in breakdown, damage, or
fire.
When the power supply has positive and negative terminals, be sure to wire
them correctly.
Electric Wires The following wire gauges are recommended.
Note The current capacity of electric wire depends on factors such as the ambient
temperature and insulation thickness as well as the gauge of the conductor.
Crimp Terminals The terminals on the I/O Unit are M3, self-raising terminals with screws. Use
crimp terminals for wiring. Do not connect bare stranded wires directly to ter-
minals. Tighten the terminal block screws to the torque of 0.5 N·m. Use crimp
terminals (M3) having the dimensions shown below.
Wiring Do not remove the protective label from the top of the Unit until wiring has
been completed. This label prevents wire strands and other foreign matter
from entering the Unit during wiring procedures. (Remove the label after wir-
ing has been completed to allow air circulation needed for cooling.)
• Wire the Units so that they can be easily replaced. In addition, make sure
that the I/O indicators are not covered by the wiring.
• Do not place the wiring for I/O Units in the same duct or raceway as power
lines. Inductive noise can cause errors in operation.
• Tighten the terminal screws to the torque of 0.5 N·m.
Terminal Block Connector Wire Size
18-terminal AWG 22 to 18 (0.32 to 0.82 mm
2
)
6.2 mm max.
6.2 mm max.
After wiringDuring wiring
Remove the label.
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