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5 Buffer Memory (BFM)
5.4 Buffer Memory Details
A
Common Items
B
FX
3U
-4AD
FX
3UC
-4AD
C
FX
3U
-4AD-ADP
D
FX
3G
-2AD-BD
E
FX
3U
-4DA
F
FX
3U
-4DA-ADP
G
FX
3G
-1DA-BD
H
FX
3U
-3A-ADP
I
FX
3U
-4AD-PT
-ADP
J
FX
3U
-4AD-PTW
-ADP
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4DA (4-channel Analog Output)
5.4.21 BFM #63: Specification of data register for automatic transfer at disconnection
detection
Setting range: 0 to 7999
Initial value: K202
Numeric data type: Decimal (K)
Use this function to automatically transfer the disconnection detection status data (BFM #28) to the data
register specified in BFM #63.
Only when wire-break is detected, data will be automatically transferred from FX
3U-4DA to the PLC. For this
reason, the PLC does not need the program for reading data, and the scan time of the PLC can be shortened.
→ For a detailed description of the disconnection detection status (BFM #28),
refer to Subsection 5.4.9.
1. If "BFM #63 = K202 (initial value)"
2. Cautions regarding disconnection detection 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 b2 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 #63 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. Therefore, when creating a program, do not
frequently write data in the above buffer memories (BFM).
5.4.22 BFM #80 to #3098: Table output function
Related BFM:
BFM #80 (start/stop command of table output function)
BFM #81 to #84 (output pattern setting of channels)
BFM #85 to #88 (output execution cycle number of channels)
BFM #89 (completion flag of table output function)
BFM #90 (table output error code)
BFM #91 (table output error source number)
BFM #98 (data table head device number)
BFM #99 (data table transfer command)
BFM #100 to #398, •••, #2800 to #3098 (data table in patterns)
Table output function: Sets predetermined output patterns as data table, and outputs analog signals
according to the data table.
→ For a detailed description of the table output function, refer to Chapter 6.
Specified data
register
Description
D202 Value of disconnection detection status (BFM #28)