Mitsubishi Electronics MELSEC-F Manuel D’Utilisation

3 Wiring

FX

3G

/FX

3U

/FX

3UC

 PLC User's Manual - Analog Control Edition

FX

3U

-4DA (4-channel Analog Output)

The analog output mode, "voltage output "or "current output", can be selected for each channel. 

*1.

For FX

3G

/FX

3U

 Series PLC (AC power type), the 24V DC service power supply is also available. 

*2.

Do not connect any wires to the " • " terminal.

*3.

Use a 2-core twisted shield wire for analog output wire, and separate it from other power lines or
inductive lines.

*4.

If there is ripple or noise in the output voltage, connect a capacitor of approximately 0.1 to 0.47

μF 25V

in the vicinity of the signal receiving side. 

*5.

Ground the shielded wire at one point on the signal receiving side.

Grounding should be performed as stated below.
• 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.

→ For details, refer to the User’s Manual - Hardware Edition of each Series.

• The grounding wire size should be AWG14 (2mm

2

.)

• The grounding point should be close to the PLC, and all grounding wires should be as short as possible.

FX

3U

-4DA

+15V

I+

VI-

V+

24+

24-

-15V

I+

VI-

V+

ch  :   represents the channel number.

ch

Shield *3

24V DC

If voltage output is

selected

If current output is

selected

External power supply

wiring

*1

ch

ch

Class-D grounding

*2

ch

Shield *3

*4

*5

*5

PLC

Other

equipment

PLC

Other

equipment

PLC

Other

equipment

Shared grounding

Good condition

Common grounding

Not allowed

Independent grounding

Best condition