!
68
When using an Expansion I/O Rack, the Rack must also be grounded to the GR
terminal. The same ground can be used for all connections.
Ground to 100 Ω or less.
OK
Ground to 100 Ω or less.
OK Wrong
Other
devices
Other
devices
Other
devices
Crimp Terminals The terminals on the Power Supply Unit are M3.5, self-raising terminals with
screws.
Use crimp terminals for wiring. Do not connect bare stranded wires
directly to terminals. Tighten the terminal block screws to the torque of 0.8 N S m.
Use crimp terminals (M3.5) having the dimensions shown below.
7 mm max.7 mm max.
3-2-2 Standard I/O Unit Wiring
Caution Check the I/O specifications for the I/O Units, and consider the following points.
• 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.
Note To satisfy the EC Directives (Low-voltage Directives), provide reinforced insula-
tion or double insulation for the DC power source connected to the DC I/O Unit.
Use a separate power source for the DC I/O Unit from the external power supply
for the Contact Output Unit.
Electric Wires The following electric wires are recommended.
Terminal Block Connector
Electric Wire Size
10-terminal AWG 22 to 18 (0.32 to 0.82 mm
2
)
19-terminal AWG 22 (0.32 mm
2
)
Note The allowable current capacity of electric wiring differs depending on factors
such as ambient temperature, insulation thickness, etc., so be sure to take these
factors into account when selecting electric wire.
Crimp Terminals The terminals on the Power Supply Unit are M3.5, self-raising terminals with
screws.
Use crimp terminals for wiring. Do not connect bare stranded wires
directly to terminals. Tighten the terminal block screws to the torque of 0.8 N S m.
Use crimp terminals (M3.5) having the dimensions shown below.
7 mm max.7 mm max.
For satisfying the EC Directives (Low-voltage Directives), provide reinforced
insulation or double insulation for the DC power supply used for the I/O Units.
Wiring
Section 3-2
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