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F-14
3 Wiring
3.4 Analog Output Line
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4DA-ADP (4-channel analog Output)
3.4 Analog Output Line
The analog output type, "voltage output" or "current output", can be selected for each channel.
*1. Use 2-core shielded twisted pair cable for the analog output lines, and separate the analog output
lines from other power lines or inductive lines.
*2. 24V DC service power supply of the FX
3G/FX3U Series PLC can also be used.
*3. Ground the shielded wire at one point on the signal receiving side.
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 User’s Manual - Hardware Edition of the PLC Series.
• The grounding wire size should be AWG22 to 20 (0.3 to 0.5 mm
2
).
• The grounding point should be close to the PLC, and all grounding wires should be as short as possible.
ch
4DA-ADP
V+, I+, ch: represents the channel number.
Terminal
block
I+
COM
V+
I+
COM
V+
Class-D
grounding
24+
24-
24V DC
*1 Shielded
If voltage output is selected:
If current output is selected:
Connection of external power
supply line
+15V
ch
*3
*2
*3
PLC
Other
equipment
PLC
Other
equipment
PLC
Other
equipment
Shared grounding
Good condition
Common grounding
Not allowed
Independent grounding
Best condition