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The improper connections will result in a short circuit, a fire accident, or erroneous operation.
Tighten the terminal screws with the specified torque. If the terminal screws are loose, a short circuit,
a fire accident, or erroneous operation will occur. Tightening the terminal screws too far, may cause
damage to the terminal screws and the module, resulting in a short circuit or a malfunction.
Make sure that there are no foreign substances such as iron filings or wiring debris inside the
module. Theses foreign substances may result in a fire accident, damage, or erroneous operation.
Wiring an I/O module
(1)
Definition of 2/3/4-wire connection:
-
2/3-wire connection(passive sensors): share the power circuit with the system
-
4-wire connection(active sensors): independently powered. Not recommended to share the same power circuit
with the system
(2)
Terminals with insulation sleeves can not be arranged as a terminal block. It is recommended that the terminals
be covered with insulation tubes.
(3)
Please use single-core cables or twin-core cables. The diameters of the cables used should be in the range of 12
AWG to 22 AWG. The torques applied to the screw terminals should be in the range of 5 kg-cm (4.3 Ib-in) to 8
kg-cm (6.9 Ib-in). Please use copper conducting wires. The temperature of the copper conducting wires should
be 60/75°C.
(4)
Please keep the input cables, the output cables, and the power cable separate form one another.
(5)
If the main circuit and the power cable can not be separated from each other, please use a shielded cable, and
ground it at the side of the I/O module. In some cases, the shielded cable is grounded at the opposite side.
(6)
If you wire a module by means of piping, you need to ground the piping correctly.
(7)
Please keep 24 VDC input cables separate from 110 VAC input cables and 220VDC input cables.
(8)
If the wiring length is more than 200 meters (686.67 inches), the leakage current will result from parasitic
capacitance, and the system will break down.
Grounding a cable
Please ground a cable according to the steps below.
(1)
Please ground a cable correctly.
(2)
The area of the cross-section of the cable which is grounded should be 2 mm
(3)
The ground point should be near the PLC. Ground the cable properly.
Shilded cable
AC power
supply
Ch a pt er 4 Ins t al l at i o n an d W ir in g
Load through which the
alternating current passes
2
or larger than 2 mm
4_
2
.
4 - 1 7
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