Bit level addressing -4, Bit level addressing – Rockwell Automation 1746-XXXX SLC 500 4-Channel Analog I/O Modules User Manual User Manual
Page 42
Publication 1746-UM005B-EN-P - June 2004
4-4 Module Operation and System Considerations
Bit Level Addressing
The following bit maps show bit level addressing for the analog inputs
and outputs. The input channel converter resolution is 16 bits, or 1
word. The output channel converter resolution is 14 bits and is loaded
from the most significant 14 bits of the associated output word.
The two least significant bits (O:e.0/0 and O:e.0/1) of the output word
have no effect on the actual output value.
1746-NI4
1746-NIO4I & NIO4V
msb
lsb
CH 1 INPUT
CH 0 INPUT
CH 3 INPUT
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1746-NO4I & NO4V
msb
lsb
XX
lsb
msb
CH 2 INPUT
CH 1 OUTPUT
CH 1 INPUT
CH 0 INPUT
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
CH 1 OUTPUT
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
CH 2 OUTPUT
CH 3 OUTPUT
CH 0 OUTPUT
msb
lsb
e = slot # of module
x = bit not used
I:e.0
I:e.1
I:e.2
I:e.3
O:e.0
O:e.1
I:e.0
I:e.1
O:e.0
O:e.1
O:e.2
O:e.3
CH 0 OUTPUT
XX
XX
X
X
XX
X
X