Siemens Simantic ET 200S Manual page 257

Note
The terminals to the sensors are protected against polarity reversal.
The maximum wire cross-section for the sensors is 0.25 mm
Connection cables for the sensors can be found in the
section with order numbers
Block diagram
Figure 5-6 Block diagram of the 4 IQ-SENSE
ET 200S
Manual, Edition 10/2005, A5E00514527-01
.
4 IQ-SENSE (6ES7138-4GA00-0AB0)
.
2
ET 200S Operating Instructions in the
5-15