Grounding - Mitsubishi FX3U Series User Manual

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
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
PLC
equipment
Independent grounding
Best condition
• The grounding wire size should be AWG 14 (2 mm
• The grounding point should be close to the PLC, and all grounding wires should be as short as possible.
26
Other Other
PLC
equipment
Shared grounding
Good condition
→ For details, refer to the Hardware Edition.
Other
PLC
equipment
Common grounding
Not allowed
2
) or larger.
4 Wiring
4.6 Grounding