Mitsubishi Electronics MELSEC-F Manuel D’Utilisation

6 Changing Input Characteristics

FX

3G

/FX

3U

/FX

3UC

 PLC User's Manual - Analog Control Edition

FX

3U

-4AD/FX

3UC

-4AD (4-channel Analog Input)

For the 4AD, the standard input characteristics are provided for each input mode (BFM #0) at the time of
factory shipment.
Changing the offset data (BFM #41 to #44) or gain data (BFM #51 to #54), however, can change the input
characteristics of each channel. This chapter describes how to change the input characteristics.

Determine the optimum input mode (BFM #0) for the selected channels and the voltage/current
specifications.

Example: Enter "HFF00" in BFM #0 to set input mode 0 for channels 1 and 2 and prevent use channels 3 and
4.

Caution regarding data setting:
• If a channel is set to the value "2", "5", "8" or "F", the input characteristics of the channel cannot be 

changed.

• Set the optimum input mode for the analog signal to be input.

Voltage input mode

-10V to +10V

-32000 to +32000

Voltage input mode

-10V to +10V

-4000 to +4000

Voltage input analog value direct indication 
mode

The offset and the gain cannot be adjusted.

Current input mode

4mA to 20mA

0 to 16000

Current input mode

4mA to 20mA

0 to 4000

Current input analog value direct indication 
mode

The offset and the gain cannot be adjusted.

Current input mode

-20mA to +20mA

-16000 to +16000

Current input mode

-20mA to +20mA

-4000 to +4000

Current input analog value direct indication 
mode

The offset and the gain cannot be adjusted.

Not used.

-

-

Channel not used

-

-