Siemens SIMATIC S7 - 3.5 Pin Assignment; 3.6 Pin Assignment of Connecting Cables

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SM 338 Equipment Manual
(4) J31069-D401-U1-A0-7618
Operation
The parameters of the SM 338 must be assigned before it can begin position
encoding. When an error occurs, it provides a diagnosis if this was enabled
in the parameter assignment.
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