Slot addressing examples -6, Slot addressing examples, Modules requiring one byte – Rockwell Automation 1747-ASB Remote I/O Adapter User Manual
Page 42: Modules requiring one word
Publication 1747-UM006B-EN-P - June 2003
3-6 Addressing
2-Slot Addressing Examples
The following example illustrates how to map modules requiring:
•
one byte or less of input or output image
•
one word of input or output image
If images overlap, a 1747-ASB module error occurs. For example, if
16 point input modules are installed in slots 1 and 2, their input
images overlap and a 1747-ASB module error occurs.
0
1
2
3
4
5
6
7
8
9
10
11 12
13
14 15 16
17
18
1746 Slot Numbering
Slot Pair
1
2
3
4
5
6
7
8
9
O
I = Input Module
= Output Module
Slot 1
Slot 2
Slot 3
Slot 4
Slot 5
Slot 6
Slot 7
Slot 8
Slot 9
Slot 10
Slot 11
Slot 12
Slot 13
Slot 14
Slot 15
Slot 16
Slot 17
Slot 18
1747-ASB Input Image
1747-ASB Output Image
Slot 1
Slot 2
Slot 3
Slot 4
Slot 5
Slot 6
Slot 7
Slot 8
Slot 9
Slot 10
Slot 11
Slot 12
Slot 13
Slot 14
Slot 15
Slot 16
Slot 17
Slot 18
Slot Pair 1
Slot Pair 2
Slot Pair 3
Slot Pair 4
Slot Pair 5
Slot Pair 6
Slot Pair 7
Slot Pair 8
Slot Pair 9
Slot 1
Slot 3
Slot 5
Slot 7
Slot 9
Slot 11
Slot 13
Slot 15
Slot 17
Slot 1
Slot 3
Slot 5
Slot 7
Slot 9
Slot 11
Slot 13
Slot 15
Slot 17
Slot 2
Slot 4
Slot 6
Slot 8
Slot 10
Slot 12
Slot 14
Slot 16
Slot 18
Slot Pair 1
Slot Pair 2
Slot Pair 3
Slot Pair 4
Slot Pair 5
Slot Pair 6
Slot Pair 7
Slot Pair 8
Slot Pair 9
Slot 2
Slot 4
Slot 6
Slot 8
Slot 10
Slot 12
Slot 14
Slot 16
Slot 18
= unused
0
7
8
15
0
7
8
15
1747-ASB Input Image
1747-ASB Output Image
0
7
8
15
0
7
8
15
I
I
I
I
I
I
I
I
I
O
O
O
O
O
O
O
O
O
7
0
10
17
Decimal
Octal
7
0
10
17
Decimal
Octal
7
0
10
17
Decimal
Octal
7
0
10
17
Decimal
Octal
Modules Requiring One Byte
In this example, the modules require one byte of input
or output image.
Input modules do not have to be paired with output
modules because, in the example to the right, only one
byte of input or output image is required.
To use image space more efficiently, slot pairing can b
used with 16-point I/O modules as shown below or
complementary I/O can be used. Refer to page 4-5.
Modules Requiring One Word
In this example, the modules require one word of input
or output image.
Input modules must be paired with output modules to
ensure the paired modules do not use the same image
locations.