Chapter 11 Installation and Wiring
10-11
11.2.2 I/O Device Wiring
1) The spec. of cable for I/O wiring shall be 0.3~2 mm
2
but it is recommend to use the convenient cable
spec.(0.3 mm
2)
).
2) Separate Input cable and Output cable for wiring.
3) I/O signal cable should be separated more than 100mm from main circuit cable of high voltage/high current.
4) If not possible to separate main circuit cable and power cable, use the shielded cable all and earth a PLC.
5) In case of pipe wiring, check the pipe completely for earth.
6)
Separate output cable of DC24V from AC110V cable or AC220V cable.
For the long distance wiring more than 200m, as it is expected to have problem by leakage current caused by
the capacity between cables, please refer to 12.4 Various Cases.
11.2.3 Earth Wiring
1) As this PLC has a sufficient measures against noise, it is possible to use it without earth except the case
having specially lots of noises.
2) Use the dedicated earth if possible.
In case of Earth works, use 3 class earth (earth resistance 100 Ω or less).
3) If not possible to use dedicated earth, use the common earth as shown on the Figure B] as below.
A) Dedicated earth : Best B) Common earth : Good C) Common earth : Poor
Input
Output
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