In documentation "project planning" ctrlX DRIVE we find XG31 connector as onboard interface on XVR1 device. Usually for control sections XG31 stands for digital and analog I/O. What is the function of XG31 in case of power supply XVR1? No further details are described in the documentation.
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XG31 on XVR is for signals LB ("ready for power") and Bb ("ready to run").
See Fig. 4-77 on page 150/431 of manual DOK-XDRV**-X**********-PR06-EN-P (R911386579)
If not controlling the power supply devices by fieldbus the digital I/Os are necessary to do so. A detailed How-to to this topic will be soon published in the dedicated area.