BECKHOFF C6640 - Manual (Page 22)

Installation Instructions
Wiring diagram
Wiring according to the wiring diagram (the circuit of PC_ON and Power-
Status is symbolical):
Wiring diagram power
supply and external switch
Connection of the Battery Pack and UPS Output
Note
Connection of the Battery Pack and UPS Output only in combination with
integrated UPS (order option).
20 C6640, C6650