Siemens Simatic S7-300 - Page 180

Priniples of analog value processing
4.2 Wiring transducers to analog inputs
S7-300 Automation System Module data
4-6 Manual, 08/2006, A5E00105505-04
Wiring non-isolated transducer to a non-isolated AI
Always operate the CPU / IM 153 in grounded mode if you connect non-isolated transducers
to non-isolated modules.
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Figure 4-4 Wiring non-isolated transducer to a non-isolated AI
Note
You may not wire non-isolated 2-wire transducers/resistive transducers to non-isolated
analog inputs!