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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)
5.4.17 BFM #50: Setting of output corrective function by load resistance
(only in voltage output mode)/BFM #51 to #54: Load resistance values
Initial value: BFM #50: H0000, BFM #51 to #54: K30000
Numeric data type: BFM #50: Hexadecimal (H), BFM #51 to #54: Decimal (K)
The output characteristics of FX
3U-4DA have been adjusted at 30 kΩ load resistance as a factory default.
When the load resistance is 1kΩ, the output deviation is approx. -4.3% to 20V in full scale, whereas the
output deviation is approx. 0.15% to 20V in full scale when the load resistance is 1MΩ. When the load
resistance is 30 kΩ or less (1 kΩ to 30 kΩ), the deviation of the output characteristics can be corrected by
specifying the output corrective function (BFM #50) and the load resistance values (BFM #51 to #54).
1. Setting of output corrective function (BFM #50)
The corrective function by load resistance is valid or invalid by writing a 4-digit hexadecimal number,
H, in the output corrective function setting (BFM #50).
2. Setting range and initial value of load resistance (BFM #51 to #54)
Set the load resistance value for each channel allocated to the following BFM.
Set value Description
0 Corrective function by load resistance is invalid.
1 Corrective function by load resistance is valid.
Other than above
values
Invalid (setting values unchanged)
BFM
number
Description Setting range (Ω) Initial value (Ω)
#51 Load resistance value for channel 1
1000 to 30000 30000
#52 Load resistance value for channel 2
#53 Load resistance value for channel 3
#54 Load resistance value for channel 4
Analog value
Digital value
The deviation of output characteristics is
corrected by the corrective function by load
resistance.
: Output characteristics after correction
: Output characteristics before correction
32000
-32000
-10V
+10V
H
ch4
ch3
ch2
ch1