B-42
5 Buffer Memory (BFM)
5.4 Details of Buffer Memories
FX
3U
/FX
3UC
Series PLC User's Manual - Analog Control Edition
FX3UC-4AD (4-channel Analog Input)
3. Caution regarding EEPROM writing
If data is set in BFM #0, #19, #21, #22, #125 to #129, or #198, the data will be written in the EEPROM of 4AD.
→ 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.
Only when the upper/lower limit error is detected, data will be automatically transferred from 4AD to the PLC.
For this reason, the PLC does not need the program for reading 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. Caution 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 such a 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 set in BFM #126 will be retained in the EEPROM.
3. Caution regarding EEPROM writing
If data is set in BFM #0, #19, #21, #22, #125 to #129, or #198, the data will be written in the EEPROM of 4AD.
→ 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
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