Addressing and Access to I/Os
S5-90U/S5-95U
6.2
Addressing the External I/Os
The addresses for the external I/Os are slot oriented.
This means that once a module is snapped onto its slot on the bus unit, it is assigned a slot number
and thus a fixed address in one or both of the process images.
Figure 6-1. Address Assignments for External I/Os
Module
=
Process Images in
the PLC
Slot number
Control
Program
Address
in a
statement
Address in the
process output image
Address in the
process input image
Data flow between module/PLC
6.2.1
Slot Numbering
The programmable controller can have a maximum of four tiers. The S5-90U has a maximum of
three bus units (6 slots) and the S5-95U has a maximum of 16 bus units (32 slots).
The slots are numbered consecutively. Numbering begins with "0" at the slot beside the
programmable controller. Whether a module is plugged in or not has no effect on the numbering.
Figure 6-2. Consecutive Numbering of Slots in a Single-Tier Configuration
30 31
AG
1
0
2
3
Slot numbers
Note
Please note that the S5-90U (IM 90) provides a maximum current of 0.3 A and the
S5-95U a maximum current of 1 A at the external I/O bus. These limits must not be
exceeded. The maximum permissible number of slots can therefore not be used in some
configurations. To by-pass this restriction, the PS 935 power supply module can
additionally be used in the S5-95U.
6-2
EWA 4NEB 812 6115-02b
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