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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
8-4
A5E00105492-03
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
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The figure below shows you how the addresses of the individual channels of a
digital module are obtained.
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Byte address:
start address of modules
Byte address:
start address of m 1
Bit address
Figure 8-2 Addresses of the I/O of digital modules
