The 24V power supply input is used for the L+ supply of the SDCI ports. The logic part of the module is supplied over the 3V3 on the 40-pin GPIO connector or the generic connector.
The connector is 4pin, 3,5mm MC-type.
Depending on the connected SDCI devices, the 24V input can consume up to 1,3A current. Please use adequate cabling. The port is not hardware overcurrent protected, the L+ lines and CQ-lines shall be current limited by the driver in software.
The 24V power input is reverse-voltage protected by a rectifier diode. The GND potential is a common potential with the host (Raspberry). The connector is 2pin, 3,5mm MC-type.