Mitsubishi Electronics MELSEC-F Manuel D’Utilisation

4 Comparison of Performance Specifications

FX

3G

/FX

3U

/FX

3UC

 PLC User's Manual - Analog Control Edition

Common Items

*1.

Adjustment of the offset or gain value will not affect the resolution.

*2.

The offset and the gain should satisfy the following condition:
1V 

≤

 (Gain - Offset) 

≤

 15V

*3.

The offset and the gain should satisfy the following condition:
4mA 

≤

 (Gain - Offset) 

≤

 32mA

Number of input points

4ch

Analog input range

-10V to +10V DC

(Input resistance: 200k

Ω)

-20mA to +20mA DC

4mA to 20mA DC

(Input resistance: 250 

Ω)

Absolute maximum input

±15V

±32mA

Offset

-5V to +5V

*1,*2

-20mA to +20mA

*1,*3

Gain

-4V to +15V

*1,*2

-16mA to +32mA

*1,*3

Digital output

With sign, 12 bits, binary

With sign, 11 bits, binary

Resolution

5mV(20V

×1/4000)

*1

20

μA(40mA×1/2000)

*1

Ov

erall a

ccu

ra

cy Ambient temperature:

25

±5°C

-

-

Ambient temperature:
0 to 55

°C

±1.0%(±200mV) for 20V full scale

±1.0%(±400μA) for 40mA full scale

Same accuracy for 4mA to 20mA input

Time required for A/D 
conversion

Normal conversion mode:15ms 

× number of selected channels

High-speed conversion mode: 6ms 

× number of selected channels

Input characteristics

Insulation method

• The photocoupler is used to insulate the analog input area from the PLC.
• The DC/DC converter is used to insulate the power supply from the analog inputs.
• Channels are not insulated from each other.

Number of I/O points 
occupied

8 points (Taken from either the input or output points of the PLC.)

0

+2000

+10V

+10.

235

V

+2047

-10V

-10.

240V

-2000

-2048

z

When the input is set from -20 mA to +20 mA:

0

+1000

+20mA

-20mA

-1000

+1600

+32m

A

-1600

-32m

A

z

When the input is set from 4 mA to 20 mA:

0

1000

20mA

4mA

1750

32

m

A