Wiring I/O Units
Section 3-5
3-5 Wiring I/O Units
Connect the I/O Devices to the I/O Units using AWG 22 lead wire (cross-section
-
2
al area: 0.3 mm ) for 19-terminal terminal blocks and AWG 22 to 18 lead wire
2
(cross-sectional area: 0.3 to 0.75 mm ) for 10-terminal terminal blocks. The ter
-
minals have screws with 3.5-mm diameter heads and self-raising pressure
plates. Connect the lead wires to the terminals as shown. Tighten the screws to a
torque of 0.8 N S m.
A
M3.5 screw
Terminal block
A
20-terminal
Terminal block
25 mm max.
Tightening torque: 0.8 N S m
38-terminal
Terminal block
16.5 mm max.
Use crimp terminals for wiring. Do not connect bare stranded wires directly to
terminal blocks. Use M3.5 screws for tightening crimp terminals.
7 mm max.
7 mm max.
WARNING Always attach crimp terminals to the wires to ensure proper connection.
!
Connecting loose wires can cause fires.
Caution Abide by the following precautions when wiring the I/O Units. Failure to abide by
!
these precautions my cause faulty operation or damage to the Unit.
• Be sure that no wire clippings or other foreign materials enter the Units when
wiring.
• Check and recheck all wiring before supplying power to the system.
• Check and recheck terminal block before mounting them to the Unit.
Note 1. Putting I/O lines and high-tension lines or power lines in the same duct or
conduit may cause the I/O lines to be affected by noise. This may cause a
malfunction in the Unit or may damage the Unit or I/O devices.
2. Use reinforced insulation or double insulation on the DC power supply con
-
nected to DC I/O Units when complying with EC directives (low voltage).
3. Use separate power supplies for Relay Output Units and DC I/O Units when
complying with EC directives (low voltage).
61
OMRON [ OMRON ELECTRONICS LLC ]
