Mitsubishi Electronics MELSEC-F Manuel D’Utilisation

5 Buffer Memory (BFM)

FX

3G

/FX

3U

/FX

3UC

 PLC User's Manual - Analog Control Edition

FX

3U

-4DA (4-channel Analog Output)

Use this function to automatically transfer the upper/lower limit function status data (BFM #39) to the data
register specified in BFM #62.
Only when the value becomes more than the upper limit or less than the lower limit, data will be automatically
transferred from FX

3U

-4DA to the PLC. For this reason, the PLC does not need the program to read data, and

the scan time of the PLC can be shortened.

→ For a detailed description of the upper/lower limit function status (BFM #39),

• If a data is already specified for the other automatic transfer functions, do not specify the same data 

register.

• This function is valid by turning on b1 of the status automatic transfer function setting (BFM #60).
• When a value out of the above setting range is set, b9 of the error status BFM #29 is turned on.
• The data set in BFM #62 will be retained in the EEPROM.

If data is set in BFM #0, #5, #10 to #17, #19, #32 to #35, #50 to #54 or #60 to #63, the data will be written in
the EEPROM of FX

3U

-4DA.

Do not turn off the power immediately after writing values in these buffer memories.
The maximum number of EEPROM rewritable times is 10,000. When creating a program, therefore, do not
frequently write data in the above buffer memories (BFM).

D201

Value of upper/lower limit function status (BFM #39)