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B-38
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD/FX3UC-4AD (4-channel Analog Input)
5.4.13 BFM #30: Model code
Initial value: K2080
Numeric data type: Decimal (K)
"K2080" (fixed value) is stored as the model code.
5.4.14 BFM #41 to #44: Offset data / BFM #51 to #54: Gain data
Setting range: See below.
Initial value: See below.
Numeric data type: Decimal (K)
If the input mode is specified in BFM #0, the offset data and the gain data of each channel will be
automatically stored. The initial offset data and gain data are set for each mode as shown in the following
table:
• Offset data: Analog input value when the digital value is "0" (reference offset value)
• Gain data: Analog input value when the digital value is equal to the reference gain value (The
reference gain value depends on the set input mode.)
1. Reference offset/gain value and initial value set at delivery
Input mode (BFM #0)
Offset
(Channels 1 to 4: BFM #41 to
#44)
Gain
(Channels 1 to 4: BFM #51 to
#54)
Set
value
Description
Reference
value
Initial value
Reference
value
Initial value
0
Voltage input
(-10V to +10V:-32000 to +32000)
0 0mV 16000 5000mV
1
Voltage input
(-10V to +10V:-4000 to +4000)
0 0mV 2000 5000mV
2
Voltage input
Analog value direct indication mode
(-10V to +10V:-10000 to +10000)
0
(Data change
impossible)
0mV
(Data change
impossible)
5000
(Data change
impossible)
5000mV
(Data change
impossible)
3 Current input (4mA to 20mA:0 to 16000) 0 4000μA 16000 20000μA
4 Current input (4mA to 20mA:0 to 4000) 0 4000μA 4000 20000μA
5
Current input
Analog value direct indication mode
(4mA to 20mA:4000 to 20000)
4000
(Data change
impossible)
4000μA
(Data change
impossible)
20000
(Data change
impossible)
20000μA
(Data change
impossible)
6
Current input
(-20mA to +20mA:-16000 to +16000)
00μA 16000 20000μA
7
Current input
(-20mA to +20mA:-4000 to +4000)
00μA 4000 20000μA
8
Current input
Analog value direct indication mode
(-20mA to +20mA:-20000 to +20000)
0
(Data change
impossible)
0μA
(Data change
impossible)
20000
(Data change
impossible)
20000μA
(Data change
impossible)