Backplane bus power for S7-1500 racks
The Siemens 6ES7505-0RA00-0AB0 is the system power supply PS 60W for the SIMATIC S7-1500, delivering 60 W to the backplane bus. It accepts 24 V, 48 V, or 60 V DC input and provides the isolated power that the rack's modules need to communicate and operate. Rated current varies with input voltage: 3 A at 24 V DC, 1.5 A at 48 V DC, and 1.2 A at 60 V DC. The input range extends from 19.2 V DC static (18.5 V dynamic) up to 72 V DC static (75.5 V dynamic), so it handles a sagging or floating DC bus without dropping the rack.
Isolation and protection specs
Reinforced isolation to 230 V AC separates the input from the backplane bus, tested at 2 500 V DC for 2 s as a routine test. That means this supply can share a panel with line-voltage contactors or drives without coupling noise into the S7-1500 backplane. Built-in short-circuit protection and reverse polarity protection are standard. The 20 ms mains failure stored energy time keeps the rack alive through a brief dip. Power loss at nominal rating is 12 W, which factors into the enclosure thermal budget. Equipment protection class I with a protective conductor terminal. IP20 rated — intended for a clean, enclosed control cabinet, not washdown areas.
Mounting and firmware status
Configurable in STEP 7 V5.5 SP3 or higher and TIA Portal V12 or higher. The status indicator on the front gives a quick visual on output health during commissioning.