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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)
5.4.16 BFM #71 to #74: Lower limit error setting / BFM #81 to #84: Upper limit error setting
Setting range: See below.
Initial value: See below.
Numeric data type: Decimal (K)
Set the upper/lower limit error data so that the upper/lower limit error status (BFM #26) can be detected.
The data setting range depends on the input mode set in BFM #0.
The following table shows the data setting range for each input mode:
1. Cautions regarding upper/lower limit error setting
• To use the set upper/lower limit error data, be sure to turn on the upper/lower limit error detection function
(b1 of BFM #22).
• To use the data addition function (b0 of BFM #22) together with this function, be sure to add the addition
data (channels 1 to 4: BFM #61 to #64) to the upper/lower limit values to be set. In addition, observe the
data setting range.
Input mode (BFM #0)
Setting range
Initial value
Set
value
Description
Lower limit value
(Channels 1 to 4:
BFM #71 to #74)
Upper limit value
(Channels 1 to 4:
BFM #81 to #84)
0
Voltage input
(-10V to +10V: -32000 to +32000)
-32768 to +32767 -32768 32767
1
Voltage input
(-10V to +10V: -4000 to +4000)
-4095 to +4095 -4095 4095
2
Voltage input
Analog value direct indication mode
(-10V to +10V:-10000 to +10000)
-10200 to +10200 -10200 10200
3
Current input
(4mA to 20mA:0 to 16000)
-1 to +16383 -1 16383
4 Current input (4mA to 20mA:0 to 4000) -1 to +4095 -1 4095
5
Current input
Analog value direct indication mode
(4mA to 20mA:4000 to 20000)
3999 to 20400 3999 20400
6
Current input
(-20mA to +20mA:-16000 to +16000)
-16384 to +16383 -16384 16383
7
Current input
(-20mA to +20mA:-4000 to +4000)
-4096 to +4095 -4096 4095
8
Current input
Analog value direct indication mode
(-20mA to +20mA:-20000 to +20000)
-20400 to +20400 -20400 20400