Siemens SIMATIC S7-300 Getting Started page 23

Step Activity
7 Select the encoder type and mode, and the measuring system. Settings for the first axis in our example:
"Encoder type" is an "Absolute encoder"
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"Encoder mode" is "Endat"
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"Measuring system" is "Rotary encoder system"
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Confirm with "Continue".
Result: The "Axis configuration - Axis_1 - Encoder - data" dialog box opens.
CPU 317T-2 DP: Controlling a physical axis
Getting Started, 03/2008, A5E00251786-05
3.8 7. Step: Configuring the axis(axes) with S7T Config
Result
Learning units
23