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4-7 Standard I/O Unit Wiring
Caution Check the I/O specifications for the I/O Units, and consider the following points.
• For the I/O Units, use a DC power supply provided with reinforced insulation or
double insulation if the EC directives (low-voltage directives) must be satisfied.
• Do not apply a voltage that exceeds the input voltage for Input Units or the
maximum switching capacity for Output Units. Doing so may result in break-
down, damage or fire.
• When the power supply has positive and negative terminals, be sure to wire
them correctly.
Electric Wires The following electric wires are recommended.
Terminal Block Connector
Electric Wire Size
10-terminal AWG 22 to 18 (0.33 to 0.82 mm
2
)
19-terminal AWG 22 (0.33 mm
2
)
Larger sizes than these can be used for common lines.
Note The allowable current capacity electric wire differs depending on factors such as
ambient temperature, insulation thickness, etc., so be sure to take these factors
into account when selecting electric wire.
The terminals have screws with 3.5-mm diameter heads and self-raising pres-
sure plates. Connect the lead wires to the terminals as shown below. Tighten the
screws with a maximum torque of 0.8 NSm.
Crimp Terminals If you wish to attach solderless type terminals to the ends of the lead wires, use
terminals having the dimensions shown below.
7 mm max.7 mm max.
Wiring Be sure that each Unit is securely mounted. In order to prevent wire scraps and
other objects from getting inside of the Unit, keep the top-surface label on while
wiring the Unit. After the wiring has been completed, be sure to remove the label
in order to allow heat radiation.
During wiring After wiring
Remove the label.
Standard I/O Unit Wiring Section 4-7
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