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B-44
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD/FX3UC-4AD (4-channel Analog Input)
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.
5.4.22 BFM #126: Upper/lower error status data automatic transfer-to data register
specification
Setting range: 0 to 7999
Initial value (at delivery) : K208
Numeric data type: Decimal (K)
Use this function to automatically transfer the upper/lower limit error status data (BFM #26) to the data
register specified in BFM #126.
When the upper/lower limit error is detected, data will be automatically transferred from the 4AD to the PLC.
For this reason, the PLC does not need any program for reading the data, and the scanning time of the PLC
can be shortened.
→ For a detailed description of the upper/lower limit error status data (BFM #26),
refer to Subsection 5.4.9.
2. Cautions regarding upper/lower limit error status data automatic transfer-to data register
specification
• If a data register is already specified for the other automatic transfer functions, do not specify the same
data register.
• Be sure to turn on the upper/lower limit error status data automatic transfer function (b5 of BFM #22) and
the upper/lower limit detection function (b1 of BFM #22).
• The data written to BFM #126 will be retained in the EEPROM.
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.
1. If "BFM #126 = K208 (initial value)"
Specified data register Description
D208 Upper/lower limit error status data in BFM #26