Festo Контроллер крайних положений SPC11 - Manual (Page 31)

1. Summary of components
1-19 Festo P.BE-SPC11-DGP-EN en 0012NH
1.5 Notes on installing the electronic components
Caution
Incorrect or missing earthing can cause faults. Connect
drive type (DGP(I)(L)-... with low impedance (short cable
with large diameter) to the earth potential, if the drive is
not mounted on an earthed machine stand.