Mitsubishi FX3U-4AD User Manual

B-18
3 Wiring
3.5 Grounding
FX 3G /FX 3U /FX 3UC PLC User's Manual - Analog Control Edition
FX3U-4AD/FX3UC-4AD (4-channel Analog Input)
3.4.2 FX3UC-4AD
*1. Use the 2-core shielded twisted pair cable for the analog input lines, and separate the analog input
lines from the other motive power lines or inductive lines.
*2. To use the current input, be sure to short circuit the line between the V + terminal and the I
+ terminal ( : channel number).
*3. The SLD and " " terminals are connected to each other inside.
*4. Do not connect any lines to the "•" terminal.
3.5 Grounding
Grounding should be performed as stated below.
• The grounding resistance should be 100Ω or less.
• Independent grounding should be performed for best results.
When independent grounding is not performed, perform "shared grounding" as shown in the following
figure.
→ For details, refer to the User’s Manual - Hardware Edition of each Series.
• Use the following grounding wire.
• The PLC grounding point should be close, and all grounding wires should be as short as possible.
FX3U-4AD
AWG14 (2mm
2
)
FX
3UC-4AD
AWG22-20 (0.3 to 0.5mm
2
)
250 Ω
6.8k Ω
ch 
200k Ω
FX 3UC -4AD
V  +, I  +, ch  :  represents the channel number.
Terminal
block
I  +
COM 
V  +
*1
I  +
COM 
V  +
250 Ω
6.8k Ω
ch 
200k Ω
*1
If current input is
selected
If voltage input is
selected
*2
•
SLD
SLD
*3
*4
Class-D
grounding
PLC
Other
equipment
PLC
Other
equipment
PLC
Other
equipment
Shared grounding
Good condition
Common grounding
Not allowed
Independent grounding
Best condition

Mitsubishi FX3U-4AD Specifications

General

Brand	Mitsubishi
Model	FX3U-4AD
Category	Controller
Language	English