Rockwell Automation Publication 1794-IN104C-EN-P - July 2018
11
FLEX I/O 220V AC Digital Input and Output Modules
Set the Input Filter Time for the 1794-IM8 Module
To select your input filter time (FT) for channels 00...07, set the corresponding
bits in the output image table (complementary word) for the module.
Input Filter Time for the 1794-IM8 Module
For example, setting bits 00, 01, and 02 as shown below sets the off-to-on filter
time for inputs 00...07 to 12 ms. For other settings, refer to the
Input Filter Time
for the 1794-IM8 Module
table.
Bits
Description
Selected
Filter Time
Maximum Filter Time (ms)
02
01
00
Filter Time for Inputs 00...07
Off to On
On to Off
0
0
0
Filter time 0 (default)
256 μs
7.5
26.5
0
0
1
Filter time 1
512 μs
8
27
0
1
0
Filter time 2
1 ms
9
28
0
1
1
Filter time 3
2 ms
10
29
1
0
1
Filter time 4
4 ms
12
31
1
0
1
Filter time 5
8 ms
16
35
1
1
0
Filter time 6
16 ms
24.5
44
1
1
1
Filter time 7
32 ms
42
60.5
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
FT = 0-07
O:010
Dec.
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.
7
6
5
4
3
2
1
0
0
1
0
= 4 Octal or 4 Decimal
1794-IM
8
