E-25
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
5.4.6 BFM#10 to #13: Offset data/BFM#14 to #17: Gain data
Setting range: See below
Initial value: See below
Numeric data type: Decimal (K)
If the output mode is specified in BFM#0, the initial value of the offset data and gain data of each channel will
be automatically stored.
The initial offset data and the gain data are set for each mode as shown in the following table:
• Offset data: Analog output value when the output data in BFM#1 to #4 are 0 (reference offset value)
• Gain data: Analog output value when the output data in BFM#1 to #4 are the reference gain values (The
reference gain value depends on the set output mode.)
1. Reference offset/gain value and initial value set
2. Offset/gain data change
Set offset data and gain data to change the output characteristics.
The offset and gain data can be set for each channel. If the voltage output mode is set, write the offset and
gain data in mV. If the current output mode is set, write the offset and gain data in μA.
To change the offset or gain data, execute the offset/gain setting value write command (BFM#9).
The setting range is shown in the following table.
*1. The offset and gain values should meet the following conditions:
1000 ≤ Gain value - Offset value ≤ 10000
*2. The offset and gain values should meet the following conditions:
3000 ≤ Gain value - Offset value ≤ 30000
3. Cautions regarding offset/gain data change
• If the analog value specification mode (mode 1 or 4) is used, the offset/gain cannot be changed.
• The offset and gain data should be set before the value write command BFM#9 is executed.
• The resolution cannot be increased by changing the output characteristics.
• When the value specified as the output mode (BFM#0) is changed, the initial value of offset and gain data
in each output mode will be automatically written.
• Even if the output characteristics are changed, the actual valid output range will not be changed:
-10 V to +10 V for the voltage output mode, and 0 mA to 20 mA in the current output mode.
→ For a detailed description of output characteristics change, refer to Chapter 7.
Output mode (BFM#0)
Offset (channels 1 to 4:
BFM#10 to #13)
Gain (channels 1 to 4:
BFM#14 to #17)
Set value Description
Reference
value
Initial value
Reference
value
Initial value
0
Voltage output
(-10 V to +10 V: -32000 to +32000)
0 0 mV 16000 5000 mV
1
Voltage output Analog value mV
specification mode
(-10 V to +10 V: -10000 to +10000)
0
(Data change
impossible)
0 mV
(Data change
impossible)
5000
(Data change
impossible)
5000 mV
(Data change
impossible)
2
Current output
(0 mA to 20 mA: 0 to 32000)
00 μA 16000 10000 μA
3
Current output
(4 mA to 20 mA: 0 to 32000)
0 4000 μA 16000 12000 μA
4
Current output Analog value μA
specification mode
(0 mA to 20 mA: 0 to 20000)
0
(Data change
impossible)
0 μA
(Data change
impossible)
10000
(Data change
impossible)
10000 μA
(Data change
impossible)
Voltage output (mV) Current output (μA)
Offset data
-10000 to +9000
*1
0 to 17000
*2
Gain data
-9000 to +10000
*1
3000 to 30000
*2
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