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9 Preparation for Wiring and Power Supply Wiring Procedures
9.3 Grounding
131
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
1
Introduction
2
Features and
Part Names
3
Product
Introduction
4
Specifications
5
Version and
Peripheral
Devices
6
System
Configuration
7
Input/Output
Nos., Unit Nos.
8
Installation
9
Preparation and
Power Supply
Wiring
10
Input Wiring
9.3 Grounding
Ground the PLC as stated below.
• Perform class D grounding. (Grounding resistance: 100 or less)
• Ground the PLC independently if possible.
If it cannot be grounded independently, ground it jointly as shown below.
Extension devices of PLC (except expansion board and special adapter)
• Use ground wires thicker than AWG14 (2 mm
2
).
• Position the grounding point as close to the PLC as possible to decrease the length of the ground wire.
PLC
Other
equipment
PLC
Other
equipment
PLC
Other
equipment
Shared grounding
Good condition
Common grounding
Not allowed
Independent grounding
Best condition
Expansion
board
Input/output
extension unit
Main unit
Special
adapter
Special
extension
Other
equipment
PLC
Independent grounding
Class D grounding
(grounding resistance : 100
or less)