B-32
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD/FX3UC-4AD (4-channel Analog Input)
2. Caution regarding convenient function setting
• Even if the data addition function is used, the value before adding the addition data (BFM#61 to #64) will
be checked to detect the over-scale error.
• To use the peak value automatic transfer function (b4 of BFM#22), be sure to enable the peak value
holding function (b3 of BFM#22).
• To use the upper/lower limit error status data automatic transfer function (b5 of BFM#22), be sure to
enable the upper/lower limit value detection function (b1 of BFM#22).
• To use the abrupt change detection status data automatic transfer function (b6 of BFM#22), be sure to
enable the abrupt change detection function (b2 of BFM#22).
• When connected and used with the FX5U or FX5UC CPU module, do not use the BFM#22 b4 to b8
automatic transfer functions.
3. Caution regarding EEPROM writing
If data is written to BFM#0, #19, #21, #22, #125 to #129, or #198, the data will also be written to the 4AD
EEPROM.
→ For a detailed description of caution regarding EEPROM writing, refer to Subsection 5.4.1.
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