Bfm#91 To #94: Abrupt Change Detection Value Setting - Mitsubishi Electric MELSEC-FX3S Series Manual

FX /FX /FX /FX /FX
3S 3G 3GC 3U
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
(-10 V
Voltage input
1
(-10 V
Voltage input
2 Analog value direct indication mode
(-10 V
3 Current input (4 mA
4 Current input (4 mA
Current input
Analog value direct indication mode
5
(4 mA
Current input
6
(-20 mA
Current input
7
(-20 mA
Current input
8 Analog value direct indication mode
(-20 mA
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-40
PLC User's Manual - Analog Control Edition
3UC
Input mode (BFM#0)
Description
to to
+10 V: -32000 +32000)
to to
+10 V: -4000 +4000)
to to
+10 V: -10000 +10000)
to
20 mA: 0
to
20 mA: 0
to to
20 mA: 4000 20000)
to to
+20 mA: -16000
to to
+20 mA: -4000 +4000)
to to
+20 mA: -20000 +20000)
Setting range
to
1 32767
to
1 4095
to
1 10000
to to
16000) 1 8191
to to
4000) 1 2047
to
1 8191
to
1 16383
+16000)
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