B-31
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)
2. Caution regarding convenient function setting
• Even if the data addition function is used, the value before adding the addition data (BFM #61 to #64) will
be checked to detect the over-scale error.
• To use the peak value automatic transfer function (b4 of BFM #22), be sure to enable the peak value
holding function (b3 of BFM #22).
• To use the upper/lower limit error status data automatic transfer function (b5 of BFM #22), be sure to
enable the upper/lower limit value detection function (b1 of BFM #22).
• To use the abrupt change detection status data automatic transfer function (b6 of BFM #22), be sure to
enable the abrupt change detection function (b2 of BFM #22).
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 cautions regarding EEPROM writing, refer to Subsection 5.4.1.
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