Mitsubishi Electric MELSEC-FX3S Series - BFM#91 to #94: Abrupt Change Detection Value Setting

B-40
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
FX 3S /FX 3G /FX 3GC /FX 3U /FX 3UC PLC User's Manual - Analog Control Edition
FX3U-4AD/FX3UC-4AD (4-channel Analog Input)
5.4.17 BFM#91 to #94: Abrupt change detection value setting
Setting range: See below.
Initial value: See below.
Numeric data type: Decimal (K)
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:
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).
Input mode (BFM#0)
Setting range Initial value
Set
value
Description
0
Voltage input
(-10 V
to +10 V: -32000 to +32000)
1
to 32767
3200
1
Voltage input
(-10 V
to +10 V: -4000 to +4000)
1
to 4095
400
2
Voltage input
Analog value direct indication mode
(-10 V
to +10 V: -10000 to +10000)
1
to 10000
1000
3
Current input (4 mA
to 20 mA: 0 to 16000) 1 to 8191
800
4
Current input (4 mA
to 20 mA: 0 to 4000) 1 to 2047
200
5
Current input
Analog value direct indication mode
(4 mA
to 20 mA: 4000 to 20000)
1
to 8191
800
6
Current input
(-20 mA
to +20 mA: -16000 to +16000)
1
to 16383
1600
7
Current input
(-20 mA
to +20 mA: -4000 to +4000)
1
to 4095
400
8
Current input
Analog value direct indication mode
(-20 mA
to +20 mA: -20000 to +20000)
1
to 20000
2000