Allen-Bradley 1747-ASB User Manual

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 181746 Slot Numbering
Slot Pair
1234 5 6789
O
I = Input Module
= Output Module
Slot 1Slot 2
Slot 3Slot 4
Slot 5Slot 6
Slot 7Slot 8
Slot 9Slot 10
Slot 11Slot 12
Slot 13Slot 14
Slot 15Slot 16
Slot 17Slot 18
1747-ASB Input Image 1747-ASB Output Image
Slot 1Slot 2
Slot 3Slot 4
Slot 5Slot 6
Slot 7Slot 8
Slot 9Slot 10
Slot 11Slot 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
07815 07815
1747-ASB Input Image 1747-ASB Output Image
07815 07815
II II I II I I
OOOO OO OOO
701017
Decimal
Octal
701017
Decimal
Octal
701017
Decimal
Octal
701017
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.
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Allen-Bradley 1747-ASB Specifications

General

Brand	Allen-Bradley
Model	1747-ASB
Category	Control Unit
Language	English