Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 141)

Technical data of CPU 31xC
6.6 Technical data of the integrated I/O
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
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Block diagram of integrated digital I/O of CPUs 313C/313C-2/314C-2
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CPU interface
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2L+
3M
1L+
1M
2M
3L+