Mitsubishi Electric MELSEC-FX3S Series - BFM#50: Setting of Output Corrective Function by Load Resistance; (Only in Voltage Output Mode);Bfm#51 to #54: Load Resistance Values

E-33
5 Buffer Memory (BFM)
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 3S /FX 3G /FX 3GC /FX 3U /FX 3UC PLC User's Manual - Analog Control Edition
FX3U-4DA (4-channel Analog Output)
5.4 Buffer Memory Details
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 1 kΩ, the output deviation is approx. -4.3 % to 20 V in full scale, whereas the
output deviation is approx. 0.15 % to 20 V in full scale when the load resistance is 1 MΩ. 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