AH500 Hardware and Operation Manual
4-20
4.4 Wiring
Points for attention
Before installing or wiring a module, users need to make sure that the external power supply
is turned off. If the power supply is not turned off, users may get an electric shock, or the
product may be damaged.
If the installation of the module or the wiring of the module is complete, users need to make
sure that a terminal block cover is installed on the module before they turn on the power
supply or operate the module. If the terminal block cover is not installed properly, users may
get an electric shock, or the module may not operate normally.
Be sure to connect the terminals FG and LG with protective grounding conductors.
Otherwise, users may get an electric shock, or the module may not operate normally.
To ensure that a PLC is wired correctly, users need to check the rated voltage of the product,
and the arrangement of the terminals. If the PLC is connected to the power supply which
does not conform to the rated voltage, or the product is not wired correctly, a fire accident
will occur, or the product will be damaged.
The external connections should be crimped or press-welded by specific tools, or soldered
correctly. 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
Wiring an I/O module
(1) Definitions of the terminals
◆ 2-/3-wire (passive sensor): the sensor and the system share the same power circuit.
◆ 4-wire (active sensor): the sensor uses independent power supply and suggested not 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 users wire a module by means of piping, they need to ground the piping correctly.
(7) Please keep 24 VDC input cables separate from 110 VAC input cables and 220 VDC 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.
Shilded cable
AC power
supply
Load through which the
alternating current passes
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