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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)
5.4.20 BFM #62: Upper/lower limit function status data automatic transfer-to data register
specification
Setting range: 0 to 7999
Initial value: K201
Numeric data type: Decimal (K)
Use this function to automatically transfer the upper/lower limit function status data (BFM #39) to the data
register specified in BFM #62.
Only when the value becomes more than the upper limit or less than the lower limit, data will be automatically
transferred from FX
3U-4DA to the PLC. For this reason, the PLC does not need the program to read data, and
the scan time of the PLC can be shortened.
→ For a detailed description of the upper/lower limit function status (BFM #39),
refer to Subsection 5.4.14.
1. If "BFM #62 = K201 (initial value)"
2. Cautions regarding upper/lower limit function status automatic transfer function setting
• If a data is already specified for the other automatic transfer functions, do not specify the same data
register.
• This function is valid by turning on b1 of the status automatic transfer function setting (BFM #60).
• When a value out of the above setting range is set, b9 of the error status BFM #29 is turned on.
• The data set in BFM #62 will be retained in the EEPROM.
3. 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. When creating a program, therefore, do not
frequently write data in the above buffer memories (BFM).
Specified data
register
Description
D201 Value of upper/lower limit function status (BFM #39)