Bfm#10 To #13: Offset Data/Bfm#14 To #17: Gain Data - Mitsubishi Electric FX3G User Manual

FX /FX /FX /FX /FX
3S 3G 3GC 3U 3UC
FX -4DA (4-channel Analog Output)
3U
5.4.6

BFM#10 to #13: Offset data/BFM#14 to #17: Gain data

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
Output mode (BFM#0)
Set value
Voltage output
0
(-10 V to +10 V: -32000 to +32000)
Voltage output Analog value mV
1 specification mode
(-10 V to +10 V: -10000 to +10000)
Current output
2
(0 mA to 20 mA: 0 to 32000)
Current output
3
(4 mA to 20 mA: 0 to 32000)
Current output Analog value μA
4 specification mode
(0 mA to 20 mA: 0 to 20000)
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.
Offset data
Gain data
*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.
PLC User's Manual - Analog Control Edition
Description
Voltage output (mV)
*1
-10000 to +9000
*1
-9000 to +10000
→ For a detailed description of output characteristics change, refer to Chapter 7.
Offset (channels 1 to 4:
BFM#10 to #13)
Reference
Initial value
value
0 0 mV
0 0 mV
(Data change (Data change
impossible) impossible)
0 μA
0
4000 μA
0
0 μA
0
(Data change (Data change
impossible) impossible)
Current output (μA)
*2
0 to 17000
*2
3000 to 30000
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
Setting range: See below
Initial value: See below
Numeric data type: Decimal (K)
Gain (channels 1 to 4:
BFM#14 to #17)
Reference
Initial value
value
16000 5000 mV
5000 5000 mV
(Data change (Data change
impossible) impossible)
10000 μA
16000
12000 μA
16000
10000 μA
10000
(Data change (Data change
impossible) impossible)
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