I/O Addresses Of A Digital Module In Slot 4 - Siemens S7-300 Installation Manual

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The example in the figure below shows which default addresses are obtained if a
digital module is inserted in slot 4 (that is, when the module start address is 0).
Slot number 3 has not been assigned since there is no interface module in the
example.
PS
Slot
number
Figure 8-3 I/O Addresses of a digital module in Slot 4
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The address of an analog input or output channel is always a word address.
The channel address depends on the module start address.
Insert the first analog module into slot 4 so that it has default start address 256.
The start address of every subsequent analog module will be incremented by 16
per slot (see diagram under 6ORWEDVHG PRGXOH DGGUHVVLQJ 
An analog I/O module has the same start addresses for its input and output
channels.
S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01
CPU
1
SM
2
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Address 0.0
0
1
Address 0.1
2
3
:
4
:
5
6
7 Address 0.7
:
:
Address 1.0
0
1
Address 1.1
2
3
:
4
5
:
6
7 Address 1.7
4
8-5