Siemens S7-300 Installation And Operating Manual page 221

Signal sensor connection
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Note
The maximum cable lengths currently specified in this manual protect against functional
impairment, even without a closer look at the boundary conditions. If the boundary
conditions, such as EMC, cable type, cable routing, etc. are examined more closely, longer
cables can be used for all F-SMs.
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
For voltage measurement
For current measurement
As 4-wire transducer
As 2-wire transducer
Load of 2-wire transducer
Technical data
Possible
Possible
Possible
Possible
Max. 600 Ω
Analog modules
9.2 SM 336; AI 6 x 13 Bit
221