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Chapter 3
Configuring Your Block I/O for PLC
Family Programmable Controllers
Discrete transfer requires 1/2 rack.
3-6
When using discrete transfer, each analog block I/O module uses 4 words
of output image table memory and 4 words of input image table memory.
Each block occupies 1/2 rack of data table, with 2 blocks comprising 1
logical rack. Image table usage for one assigned rack number is shown in
Figure 3.3.
Figure 3.3
I/O Image Table for One Assigned Rack Number using Discrete Transfer
Input Image
15
8
7
17
10
7
Input 0
0
Input 1
1
Input 2
2
Input 3
3
Input 0
4
Input 1
5
Input 2
6
Input 3
7
Output Image
15
8
7
17
10
7
Configuration
0
Output 0
1
Output 1
2
Reserved
3
Configuration
4
Output 0
5
Output 1
6
Reserved
7
0
SLC 500
PLC
0
1/2 Rack
1/2 Rack
0
SLC 500
PLC
0
1/2 Rack
1/2 Rack
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