Ground Wiring; External Wiring Example - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Ground wiring

Grounding
Perform the following.
• Perform class D grounding (Grounding resistance: 100  or less).
• Ground the programmable controller independently when possible.
• If the programmable controller cannot be grounded independently, perform the "Shared grounding" shown below.
Other
PLC
equipment
Independent grounding
(Best condition)
• Bring the grounding point close to the PLC as much as possible so that the ground cable can be shortened.

External wiring example

The followings show the examples of external wiring.
For the voltage input
CH
Shield wire
In  of CH, the CH number is entered.
For the current input
CH
Shield wire
In  of CH, the CH number is entered.
Precautions
Use a two-conductor shielded twisted pair cable for analog input lines and carry out the wiring while separating them from
other power lines and lines susceptible to induction.
Other
PLC
equipment
Shared grounding
(Good condition)
Analog input module
V+
COM
FG
Analog input module
I+
COM
FG
Other
PLC
equipment
Common grounding
(Not allowed)
1
1 FX5-4AD
87
1.6 Wiring