Wiring The Encoder Supply; Non-Isolated Installation; Example Of The Encoder Supply Via Sm 335 - Siemens SIMATIC S7-300 Manual

Wiring the inputs and outputs

2.5 Wiring the encoder supply

2.5 Wiring the encoder supply
purpose
The encoder supply is provided for resistive transducers (e.g. linear potentiometers)
Connection
The figure below shows the wiring of the encoder supply
Figure 2-3

Non-isolated installation

Analog ground of SM 335 (PIN 6) is interconnected internally with ground of the 10 V
encoder supply (PIN 8).
Do not interconnect PIN 10 once again with PIN 6 or ground if using the 4-wire measurement
shown in the previous figure. Such circuitry would develop a ground loop that is subject to
interference coupling.
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Example of the encoder supply via SM 335

SM 335 - High-speed analog mixed module for SIMATIC S7-300
Manual, 02/2009, A5E02409063-01