B-44
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)
5.4.24 BFM #128: Over-scale status data automatic transfer-to data register specification
Setting range: 0 to 7999
Initial value (at delivery) : K210
Numeric data type: Decimal (K)
Use this function to automatically transfer the over-scale status data (BFM #28) to the data register specified
in BFM #128.
Only when over-scale 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 over-scale status data (BFM #28), refer to Subsection 5.4.11.
2. Caution regarding over-scale 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 over-scale status data automatic transfer function (b7 of BFM #22).
• The data set in BFM #128 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.
5.4.25 BFM #129: Error status data automatic transfer-to data register specification
Setting range: 0 to 7999
Initial value (at delivery) : K211
Numeric data type: Decimal (K)
Use this function to automatically transfer the error status data (BFM #29) to the data register specified in
BFM #129.
When an 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 error status data (BFM #29), refer to Subsection 5.4.12.
2. Caution regarding 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 error status data automatic transfer function (b8 of BFM #22).
• The data set in BFM #129 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 #128 = K210 (initial value)"
Specified data register Description
D210 Over-scale status data in BFM #28
1. If "BFM #129 = K211 (initial value)"
Specified data register Description
D211 Error status data in BFM #29
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