Allen-Bradley 1771-ASB User Manual

Addressing Modes for Your Remote I/O
Chapter 3
3-6
Figure 3.5
16point
Input and Output Modules Using T wo W ords of the Image T able
17 16 15 14 12
10
07
06
05 03
02 01
00
04
11
13
Output image table word corresponding
to the I/O group.
17 16 15 14 12
10
07
06
05 03
02 01
00
04
11
13
Input image table word corresponding
to the I/O group.
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
Input
Terminals
Output
Terminals
15559
2slot I/O Group
Because these modules use a full word in the image table, the only type of
module you can use in a 2-slot I/O group with a 16-point module is one
that performs the opposite (complementary) function; an input module
complements an output module and vice-versa.
You can use an 8-point module with a 16-point module in a 2-slot group; it
must perform the opposite function. However, eight bits in the I/O image
table are unused.

Allen-Bradley 1771-ASB Specifications

General

Brand	Allen-Bradley
Model	1771-ASB
Category	I/O Systems
Language	English