User`s manual

26
FX3U Series Programmable Controllers
User’s Manual - MODBUS Serial Communication Edition
4 Wiring
4.6 Grounding
4.6 Grounding
Grounding should be performed as stated below.
• The grounding resistance should be 100 Ω or less.
• Independent grounding should be performed for best results.
When independent grounding can not be performed, perform "shared grounding" as shown in the following
figure
→ For details, refer to the Hardware Edition.
• The grounding wire size should be AWG 14 (2 mm
2
) or larger.
• The grounding point should be close to the PLC, and all grounding wires should be as short as possible.
PLC
Other
equipment
PLC
Other
equipment
PLC
Other
equipment
Shared grounding
Good condition
Common grounding
Not allowed
Independent grounding
Best condition