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7-3 Input filter settings
Every expansions filter option is set via a special FLASH data register FD inside the PLC. See
the following chart:
Channel's ID
Module
0CH - 3CH
1#
FD8250
module
2#
FD8258
module
3#
FD8266
module
4#
FD8274
module
5#
FD8282
module
6#
FD8290
module
7#
FD8298
module
Each channel's filter mode is assigned by a corresponding register's 4 bits. Each bit's definition is
shown in the following table:
Take module 1 as example
Register FD8250:
Channel 1
Bit7
Bit6
00: 1/4 filter
01: no filter
10: 1/2 filter
11: 1/3 filter
Channel 3
Bit15
Bit14
00: 1/4 filter
01: no filter
10: 1/2 filter
11: 1/3 filter
XC series analog expansions User Manual Page 48 of 53
4CH - 5CH
FD8251 Low byte
FD8259 Low byte
FD8267 Low byte
FD8275 Low byte
FD8283 Low byte
FD8291 Low byte
FD8299 Low byte
Bit5
Bit4
-
-
-
-
Bit13
Bit12
-
-
-
-
Take 1# module as example:
FD8250 H O O O O
FD8251 H O O O O
Channel 0
Bit3
Bit2
00: 1/4 filter
01: no filter
10: 1/2 filter
11: 1/3 filter
Channel 2
Bit11
Bit10
00: 1/4 filter
01: no filter
10: 1/2 filter
11: 1/3 filter
0CH
1CH
2CH
3CH
4CH
5CH
Bit1
Bit0
-
-
-
-
Bit9
Bit8
-
-
-
-
MANU003R2V1
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