BECKHOFF EL7037 - Manual (Page 57)

Installation
Unipolar motors
Bipolar control of a unipolar motor
Fig. 41: Bipolar control with only one half of each winding is controlled
Encoder
Connecting an encoder (24 V)
Fig. 42: The encoder is supplied from the power contacts via terminal points 3 (+24 V) and 7 (0 V).
EL70x7 57 Version 1.0