Grounding - Mitsubishi Electric MELSEC iQ-F FX6U Hardware User Manual

6.3

Grounding

Perform the following.
• Perform class D grounding (Grounding resistance: 100 Ω or less).
• Ground the PLC independently when possible.
• If the PLC cannot be grounded independently, perform the "Shared grounding" shown below.
Other
PLC
equipment
Independent grounding
(Best condition)
PLC extension devices (excluding expansion boards and communication adapters)
PLC
Expansion Expansion
adapter board
• Use a grounding wire with thickness of AWG 14 (2 mm
• Bring the grounding point close to the PLC as much as possible so that the ground cable can be shortened.
Other
PLC
equipment
Shared grounding
(Good condition)
CPU
Extension
module
module
Independent grounding
class D grounding (grounding resistance: 100  or less)
2
) or thicker.
Other
PLC
equipment
Common grounding
(Not allowed)
Other
Intelligent
equipment
module
6
6 WIRING
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6.3 Grounding