BECKHOFF CX50x0 - Manual (Page 32)

Notes on the documentation
30 CX50x0 - Hardware Documentation
Power supply
This power supply unit is equipped with an I/O interface, which permits connection of the Beckhoff Bus Terminals.
The power is supplied via the upper spring-loaded terminals labeled “24V” and “0V”.
The supply voltage supplies the CX system ant the terminal Bus and Bus Terminal with a voltage of 24 V DC (-
15 %/+20 %). The dielectric strength of the power supply unit is 500 V
rms
. Since the Terminal Bus (K- and E-bus) only
transfers data, a separate power supply is required for the Bus Terminals. This is provided by means of the power
contacts, which are not connected to the power supply.
Requirements for the 24V power supply
The power supply must be capable to supply 4A to guarantee proper function of CPU module and terminals.
LED
If the power supply unit is connected correctly and the power supply is switched on, the two upper LEDs in the
terminal prism are green. The left LED (Us) indicates the CPU supply. The right LED (Up) indicates the terminal
supply. The other LEDs indicate the Terminal Bus status. A detailed description of the LEDs can be found in section
"LED troubleshooting".