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 80
Ω
or 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 grounding
less than 6.2mm
cable solderless terminal (fork shaped)
Other device
Summary of Contents for GLOFA G7M-DR20U
Page 28: ...Chapter 4 Names of Parts 4 3 2 G7M DRT60U N 3 G7M DT60U N 4 G7M DT60U P...
Page 29: ...Chapter 4 Names of Parts 4 4 5 G7M DR60U DC 6 G7M DRT60U N DC 7 G7M DT60U N DC...
Page 31: ...Chapter 4 Names of Parts 4 6 3 G7M DT40U N 4 G7M DT40U P 5 G7M DR40U DC...
Page 32: ...Chapter 4 Names of Parts 4 7 6 G7M DRT40U N DC 7 G7M DT40U N DC 8 G7M DT40U P DC...
Page 33: ...Chapter 4 Names of Parts 4 8 4 1 3 30 point main unit 1 G7M DR30U 2 G7M DRT30U N 3 G7M DT30U N...
Page 34: ...Chapter 4 Names of Parts 4 9 4 G7M DT30U P 5 G7M DR30U DC 6 G7M DRT30U N DC...
Page 36: ...Chapter 4 Names of Parts 4 11 2 G7M DRT20U N 3 G7M DT20U N 4 G7M DT20U P...
Page 37: ...Chapter 4 Names of Parts 4 12 5 G7M DR20U DC 6 G7M DRT20U N DC 7 G7M DT20U N DC...
Page 38: ...Chapter 4 Names of Parts 4 13 8 G7M DT20U P DC...
Page 159: ...Chapter 7 Usage of Various Functions 7 52 c Program...
Page 183: ...Chapter 7 Usage of Various Functions 7 76 c Program...
Page 253: ...Chapter 8 Communication Functions 8 27 b When uses Ch 1 Built in RS 485...
Page 356: ...Appendix 1 System Definitions App1 9 6 Position Parameter...
Page 357: ...Appendix 1 System Definitions App1 10 7 High Speed Counter Parameter...