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5 Buffer Memory (BFM)
5.4 Buffer Memory Details
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4DA (4-channel Analog Output)
3. Cautions regarding use of the output corrective function by load resistance
• While changing the settings, the output is stopped, and H0000 is automatically written in the output status
(BFM #6).
At the completion of writing, the output status (BFM #6) will automatically change to H1111, and the output
will be restarted.
• This function is valid only in the voltage output mode (mode 0 or 1).
• The corrective function by load resistance is valid only at a load resistance from 1 k to 30 kΩ.
• If a setting is out of the upper setting range, b7 of the error status BFM #29 is turned on.
• When not using this function, the output characteristics at a load resistance of 30 kΩ are applied.
4. Cautions regarding EEPROM writing
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. Therefore, when creating a program, do not
frequently write data in the above buffer memories (BFM).
5.4.18 BFM #60: Status automatic transfer function setting
Initial value: H0000
Numeric data type: Hexadecimal (H)
When the bits, b0 to b2, of BFM #60 are turned on, the assigned functions (see the table below) are valid.
When the bits are turned off, the functions are invalid.
1. Assignment to each bit of BFM #60
2. Cautions regarding the status automatic transfer function
• While changing the settings, the output is stopped, and H0000 is automatically written in the output status
(BFM #6).
At the completion of writing, the output status (BFM #6) will automatically change to H1111, and the output
will be restarted.
3. Cautions regarding EEPROM writing
If data is written to BFM #0, #5, #10 to #17, #32 to #35, #50 to #54 or #60 to #63, the data will also 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).
Bit No. Description Reference
b0
When the value of the error status (BFM #29) changes,
the status value is transferred to the data register
specified by BFM #61.
Subsection 5.4.10
Subsection 5.4.19
b1
When the value of the upper/lower limit function status
(BFM #39) changes, the status value is transferred to the
data register specified by BFM #62.
Subsection 5.4.14
Subsection 5.4.20
b2
When the value of the disconnection detection status
(BFM #28) changes, the status value is transferred to the
data register specified by BFM #63.
Subsection 5.4.9
Subsection 5.4.21
b3 to b15 Invalid (setting values unchanged) -