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Chapter 9 Installation and Wiring
9-9
9.2.3 Grounding
(1) This PLC has sufficient protection against noise, so it can be used without grounding except for special much noise. However,
when grounding it should be done conforming to below items
.
(2) Ground the PLC as independently as possible. Class 3 grounding should be used (grounding resistance 80Ωor less).
(3) When independent grounding is impossible, use the joint grounding method as shown in the figure below (B).
(A)Independent grounding : Best (B) Joint grounding : Good (C) Joint grounding : Not allowed
(4) Use 2 ㎟(14AWG) or thicker grounding wire. Grounding point should be as near as possible to the PLC to minimize the
distance of grounding cable.
9.2.4 Cable Specifications for wiring
The specifications for wiring is as follows:
Cable Specifications ()
Kinds of external connection
Minimum Maximum
Digital Input 0.18 (AWG24) 1.5 (AWG16)
Digital Output 0.18 (AWG24) 2.0 (AWG14)
Analog Input / Output 0.18 (AWG24) 1.5 (AWG16)
Communication 0.18 (AWG24) 1.5 (AWG16)
Main power 1.5 (AWG16) 2.5 (AWG12)
Grounding 1.5 (AWG16) 2.5 (AWG12)
•
Be sure to use solderless terminal for power supply and I/O wiring.
•
Be sure to use M3 type as terminal screw.
•
Make sure that terminal screw is connected by 6∼9 ㎏·㎝ torque..
•
Be sure to use fork shaped terminal screw as shown below.
PLC
Other device
PLC PLC
Other device
Class 3 grounding
Class 3
g
roundin
g
less than 6.2mm
cable solderness terminal (fork shaped)
Other device