B-43
5 Buffer Memory (BFM)
5.4 Details of Buffer Memories
A
Common Items
B
FX
3UC
-4AD
C
FX
3U
-4AD-ADP
D
FX
3U
-4DA-ADP
E
FX
3U
-4AD-PT
-ADP
F
FX
3U
-4AD-TC
-ADP
G
PID Instruction
(FNC 88)
FX
3U
/FX
3UC
Series PLC User's Manual - Analog Control Edition
FX3UC-4AD (4-channel Analog Input)
5.4.23 BFM #127: Abrupt change detection status data automatic transfer-to data register
specification
Setting range: 0 to 7999
Initial value (at delivery) : K209
Numeric data type: Decimal (K)
Use this function to automatically transfer the abrupt change detection status data (BFM #27) to the data
register specified in BFM #127.
Only when abrupt change 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 abrupt change detection status data (BFM #27),
refer to Subsection 5.4.10.
2. Caution regarding abrupt change detection 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 abrupt change detection status data automatic transfer function (b6 of BFM #22) and
the abrupt change detection function (b2 of BFM #22).
• The data set in BFM #127 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 #127 = K209 (initial value)"
Specified data register Description
D209 Abrupt change detection status data in BFM #27
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