Rockwell Automation Publication 1794-IN102D-EN-P - July 2018 15
FLEX I/O AC Digital Input Modules
Setting the Input Filter Time
You can increase the input filter time (FT) for channels 00...07 (1794-IA8 and
1794-IA8I) and channels 00...15 (1794-IA16) by setting the corresponding bits
in the output image table (complementary word) for the module.
For example, to increase the off-to-on filter time to 12 ms for all inputs at address
rack 1, module group 0, set bits, and program as shown below.
To increase the filter time, set the bits according to the Input Filter Time
table.
Image Table Memory Map for the 1794-IA16 Module
Dec 1514131211109876543210
Oct 17161514131211107 6 5 4 3 2 1 0
Read 1I15I14I13I12I11I10I9I8I7I6I5I4I3I2I1I0
Write 3 Not used – set to 0
Input Filter FT
12...15
Input Filter FT
0...11
Where
I = Input
FT = Input filter time
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
FT = 12-15 FT = 0-11
1794-IA8, 1794-IA8I
1794-IA16
O:010
Dec.
1
00
76543
FLL
I:000
00
Fill File
Source
Destination
Length
#O:010
1
Write FT to complement
of input module.
Write filter time on system startup.
7654 32 1 0
0
1
0
= 4 Octal or 4 Decimal
21 0
= 44 Octal or 36 Decimal
010100
1794-IA8
1794-IA16
1794-IA8I
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