Configuring your ac input module, Input filter time – Rockwell Automation 1794-IA8_IA8I_IA16 FLEX I/O ac Input Modules Installation Instructions User Manual
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Publication 1794-IN102B-EN-P - June 2004
Wiring Connections for the 1794-IA8I
1794-TB2, -TB3, or -TB3S Terminal Base Wiring for the
1794-IA8I
1794-TBN Terminal Base Wiring for 1794-IA8I
Configuring Your ac Input Module
Image Table Memory Map for the 1794-IA8, -IA8K
and -IA8I
.
Image Table Memory Map for the 1794-IA16
Setting the Input Filter Time
You can increase the input filter time (FT) for channels 00-07 (1794-IA8,
-IA8K, -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 12ms 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 table below.
Input Filter Time
Input
1794-TB2, -TB3, -TB3S
1794-TBN
Input
Terminal
120V ac L2
Common
Input
Terminal
120V ac L2
Common
Input 0
A-0
A-1
B-0
C-1
Input 1
A-2
A-3
B-2
C-3
Input 2
A-4
A-5
B-4
C-5
Input 3
A-6
A-7
B-6
C-7
Input 4
A-8
A-9
B-8
C-9
Input 5
A-10
A-11
B-10
C-11
Input 6
A-12
A-13
B-12
C-13
Input 7
A-14
A-15
B-14
C-15
A = Even numbered terminals 0 thru 14 for customer
connections; corresponding odd numbered 120V ac
common L2 terminals 1 thru 15 for customer
connections from isolated power supply.
B = Even numbered terminals 0 thru 14
for customer connections; C = Odd
numbered120V ac common L2
terminals 1 thru 15 for customer
connections from isolated power
supply.
Dec.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Oct.
17
16
15
14
13
12
11
10
7
6
5
4
3
2
1
0
Read
I7
I6
I5
I4
I3
I2
I1
I0
Write
Not used - set to 0
Filter Time FT
0-7
Where I
=
Input
FT = Input filter time.
Dec.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Oct.
17
16
15
14
13
12
11
10
7
6
5
4
3
2
1
0
Read 1
I
15
I
14
I
13
I
12
I
11
I
10
I9
I8
I7
I6
I5
I4
I3
I2
I1
I0
Write 3
Not used - set to 0
Input Filter FT
12-15
Input Filter FT
0-11
Where
I = Input
FT = Input filter time
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
34
(1794-TB3 shown)
A
B
C
Connect Inputs to even numbered terminals on row (A)
Connect 120V ac common L2 to odd numbered terminals on row (A)
16
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
51
33
34
B
C
Even Numbered I/O Terminals 0 thru 14
Odd Numbered I/O Terminals 1 thru 15
(1794-TBN shown)
Connect Inputs to even numbered terminals on row (B)
L2 = 120V ac common - Connect to odd numbered terminals on row (C)
Bits
Description
Maximum
Filter Time
1794-IA8, -IA8K
(ms)
Maximum
Filter Time
1794-IA8I
(ms)
Maximum
Filter Time
1794-IA16
(ms)
02
01
00
Filter Time -
inputs 00-11
Selected
Filter
Time
Off to
On
On to
Off
Off
to
On
On
to
Off
Off
to
On
On
to
Off
05
04
03
Filter Time -
inputs 12-15
0
0
0
Filter Time 0
(Default)
256
µs
8.4
26.4
8.4
26.4
7.5
26.5
0
0
1
Filter Time 1
512
µs
8.6
26.6
8.6
26.6
8
27
0
1
0
Filter Time 2
1ms
9
27
9
27
9
28
0
1
1
Filter Time 3
2ms
10
28
10
28
10
29
1
0
0
Filter Time 4
4ms
12
30
12
30
12
31
1
0
1
Filter Time 5
8ms
16
34
16
34
16
35
1
1
0
Filter Time 6
16ms
24
42
24
42
24.5
44
1
1
1
Filter Time 7
32ms
40
58
40
58
42
60.5
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
FT = 12-15
FT = 0-11
1794-IA8, -IA8I
1794-IA16
O:010
Dec.
1
0
0
7
6
5
4
3
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
2
1
0
= 44 Octal or 36 Decimal
0
1
0
1
0
0
1794-IA8
1794-IA16
1794-IA8I