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PLC User's Manual - Analog Control Edition
3G
3U
3UC
FX
-4AD/FX
-4AD (4-channel Analog Input)
3U
3UC
5.4.17 BFM #91 to #94: Abrupt change detection value setting
When channel data (BFM #10 to #13) is updated, if the difference between the previous value and the new
value is larger than the set abrupt change detection value (value set in BFM #91 to #94), the system will judge
that the channel data is changed abruptly.
The result of abrupt change detection will be written to BFM #27 as the abrupt change detection status data.
The abrupt change detection value setting range depends on the set input mode (BFM #0) as shown in the
following table:
Set
value
Voltage input
0
(-10V
Voltage input
1
(-10V
Voltage input
2
Analog value direct indication mode
(-10V
3
Current input (4mA
4
Current input (4mA
Current input
Analog value direct indication mode
5
(4mA
Current input
6
(-20mA
Current input
7
(-20mA
Current input
8
Analog value direct indication mode
(-20mA
1. Caution regarding abrupt change detection value setting
To use the abrupt change detection value, be sure to turn on the abrupt change detection function (b2 of BFM
#22).
B-42
Input mode (BFM #0)
Description
to
to
+10V:-32000
+32000)
to
to
+10V:-4000
+4000)
to
to
+10V:-10000
+10000)
to
to
20mA:0
to
to
20mA:0
to
to
20mA:4000
20000)
to
to
+20mA:-16000
+16000)
to
to
+20mA:-4000
+4000)
to
to
+20mA:-20000
+20000)
Setting range
to
1
32767
to
1
4095
to
1
10000
to
16000)
1
8191
to
4000)
1
2047
to
1
8191
to
1
16383
to
1
4095
to
1
20000
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
Setting range: See below.
Initial value: See below.
Numeric data type: Decimal (K)
Initial value
3200
400
1000
800
200
800
1600
400
2000
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