Grounding - Mitsubishi Electric FX3U-232-BD User Manual

FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
3. Switching of 1 pair / 2 paired wiring (FX
The FX -485-BD-RJ has a built-in wiring circuit switch.
3G
Set the wiring circuit switch to 1 pair / 2 pair.
4.4

Grounding

Grounding should be performed as stated below.
• The grounding resistance should be 100 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.
Other
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.
-485-BD-RJ)
3G
Wiring circuit
switch
For details, refer to the Hardware Edition of each series.
Other
PLC PLC
equipment
Shared grounding Common grounding
Good condition Not allowed
2
) or larger.
Other
equipment
4 Wiring
4.4 Grounding
A
B
C
D
E
F
G
H
I
Apx.A
F-39