Addresses Of The I/O Of Digital Modules - Siemens CPU 313C Hardware And Installation Manual

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The byte address depends on the module start address.
The bit address is the number printed on the module.
Insert the first digital module into slot 4 so that it has default start address 0. The
start address of every subsequent digital module will be incremented by 4 per slot
(see diagram under 6ORWEDVHG PRGXOH DGGUHVVLQJ 
The figure below shows you how the addresses of the individual channels of a
digital module are obtained.
Figure 8-2 Addresses of the I/O of digital modules
8-4
0
1
2
Byte address:
3
4
start address of modules
5
6
7
0
1
2
3
Byte address:
4
start address of modules + 1
5
6
7
Bit address
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03