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Addressing
If the programmable controller consists of more than one tier, numbering of the expansion tiers is
continued at the slot on the extreme left.
Slot numbers
26 27
28
29
18
19
20
21
8 9
10
11
0
1
CPU
Figure 6-3. Slot Numbering in a Multi-Tier Configuration
When expanding your system, always add the new bus units to the topmost tier on the right. Other-
wise, the slot numbers on the right of the new bus units will be changed, requiring address changes
in your control program.
Note
After every expansion, check to make certain that the addressing used in the control
program is the same as that in the actual configuration.
6-2
30
31
22
23 24
25
12
13
14 15
16
17
2
3
4 5 6
7
S5-100U
EWA 4NEB 812 6120-02
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