Siemens Simatic S7-300

Priniples of analog value processing
4.2 Wiring transducers to analog inputs
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
4-5
4.2.2 Wiring electrically non-isolated transducers
Non-isolated transducer
Non-isolated sensors are connected to local ground potential (local ground.) Always connect
M
ANA
to local ground when using non-isolated transducers.
Local conditions or disturbance may cause potential differences CMV (static or dynamic)
between locally distributed measuring points. If the permissible CMV values is exceeded,
interconnect the measuring points by means of equipotential conductors.
Wiring non-isolated transducer to electrically isolated AI
When wiring non-isolated transducers to electrically isolated modules, the CPU / IM 153 can
be operated in grounded mode or ungrounded mode.
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Figure 4-3 Wiring non-isolated transducer to electrically isolated AI