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S5-100U
6
Addressing
The inputs and the outputs have different assigned addresses so that you can access them
specifically. The I/O addresses are the same as the module slot addresses.
When you mount a module in a slot on a bus unit, the module is assigned a slot number and
consequently a fixed byte address in one or both process image I/O tables.
Connect the sensors and actuators to the terminal block. The terminal selected determines the
channel number.
I/O module
Slot number
+
Channel number
Data direction: module - CPU
6.1
Slot Numbering
The programmable controller can have a maximum of four tiers. You can use up to 16 bus units
(32 slots). The slots are numbered consecutively. Numbering begins with "0" at the slot beside
the CPU. Whether a module is plugged in or not has no effect on the numbering.
CPU
0
1
2 3
Figure 6-2. Consecutive Numbering of Slots in a Single-Tier Configuration
EWA 4NEB 812 6120-02
Process image I/O
tables in the CPU
Address in the pro-
cess image input
table (PII)
Address in the pro-
cess image output
table (PIQ)
Figure 6-1. Address Assignment
Slot numbers
30 31
Control
program
Address
=
in a
statement
Addressing
6-1
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