Mitsubishi Electronics MELSEC-F Manuel D’Utilisation
B-17
3 Wiring
3.5 Grounding
A
Comm
on I
te
te
ms
B
FX
3U
-4AD
FX
3UC
-4
A
D
C
FX
3U
-4A
D
D
-A
D
P
D
FX
3G
-2A
D
D
-BD
E
FX
3U
-4DA
F
FX
3U
-4D
A
A
-AD
P
P
G
FX
3G
-1D
A
A
-BD
H
FX
3U
-3
A-
ADP
I
FX
3U
-4
A
D
-P
T
-
A
D
P
J
FX
3U
-4A
D
D
-P
TW
-
A
A
D
P
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX
3U
-4AD/FX
3UC
-4AD (4-channel Analog Input)
3.4.2
FX
3UC
-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.
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).
+ 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 100
• The grounding resistance should be 100
Ω 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.
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.
FX
3U
-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