Siemens Simatic S7-1500 System power supply, buffer functionality Part number 6ES7505-0RB00-0AB0

Product Overview

The Siemens 6ES7505-0RB00-0AB0 is a **PS 60W 24/48/60 V DC HF system power supply module** for the SIMATIC S7-1500 automation platform. It delivers regulated DC power to the S7-1500 backplane bus and includes integrated buffering to maintain CPU RAM data during short power interruptions. With broad DC input compatibility, high EMC robustness, and built-in protection features, it ensures stable system power for industrial automation environments.

Key Features

• System power supply module for SIMATIC S7-1500
• 60 W backplane power output
• Wide DC input range: 24 V, 48 V, or 60 V DC
• Integrated buffer duration of approx. 20 ms for CPU RAM retention
• Reverse-polarity, short-circuit, and surge protection
• High EMC immunity suitable for industrial environments
• LED status indicator for supply and diagnostics
• DIN-rail / S7-rack compatible mounting
• Compact form suitable for control-cabinet installations

Technical Specifications

• Article Number: 6ES7505-0RB00-0AB0
• Product Type: PS 60W 24/48/60 V DC HF
• Input Voltage: 24 V / 48 V / 60 V DC
• Input Voltage Range (permitted): approx. 19.2 V … 72 V DC (static), extended dynamic range to approx. 18.5 V … 75.5 V DC
• Backplane Output Power: 60 W
• Input Current (typical): 3 A at 24 V; 1.5 A at 48 V; 1.2 A at 60 V
• Inrush Current: ≤ 8 A (≤ 1 s)
• Power Loss: approx. 12 W
• Buffer Time: approx. 20 ms (CPU RAM retention on power failure)
• Protection Functions: Reverse-polarity protection, short-circuit protection, surge/overvoltage protection
• Isolation Rating: Tested to approx. 2.5 kV DC
• Degree of Protection: IP20
• Mounting: DIN-rail / S7-rack compatible
• Indicator: LED for power/diagnostics

Compliance & Standards

• Designed for SIMATIC S7-1500 industrial automation systems
• Meets industrial EMC and surge-immunity requirements
• Suitable for use in protected control-cabinet environments
• Includes standard low-voltage protective measures for safe operation

Applications

This power supply module is used to energize the backplane bus of S7-1500 PLC racks, ensuring stable operation of CPUs and I/O modules. It is suitable for factory automation systems, machine controllers, process control cabinets, distributed automation racks, and installations requiring reliable DC power with short-duration buffering for data retention.