MeloAuto-Trusted PLC & DCS Parts Supplier
High-Capacity Power for S5 Systems
The 6ES5951-7LB21 operates as a high-capacity power supply module for the Siemens SIMATIC S5 programmable controller series. This unit converts AC mains voltage into stable DC power for large PLC configurations. It delivers a regulated 5 VDC output with exceptional current capacity. The module also provides an auxiliary 24 VDC output for field devices. Consequently, it ensures reliable operation of extensive automation systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Series | SIMATIC S5 |
| Category | Power Supply Module |
| Part Number | 6ES5951-7LB21 |
| Input Voltage | 120/230 VAC (selectable) |
| Input Frequency | 47-63 Hz |
| Output Voltage 1 | 5 VDC (main) |
| Output Current 1 | 40 A (5 VDC) |
| Output Voltage 2 | 24 VDC (auxiliary) |
| Output Current 2 | 2.0 A (24 VDC) |
| Power Rating | 300 W |
| Efficiency | 89% (typical) |
| Hold-up Time | 25 ms at 230 VAC |
| Protection Features | Overvoltage, short-circuit, overload, overtemperature |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Dimensions | Standard S5 double-width |
| Weight | 2.5 kg |
| Status Indicators | LEDs (5V OK, 24V OK, overvoltage fault) |
| Terminals | Screw-type |
Protection and Monitoring Features
The 6ES5951-7LB21 incorporates comprehensive protection circuitry for system safety. Overvoltage protection safeguards connected modules from voltage spikes. Short-circuit protection limits current and automatically recovers upon fault removal. The module also monitors output voltages continuously and illuminates status LEDs accordingly. This constant monitoring allows users to identify power issues quickly. Additionally, the unit includes overtemperature protection to prevent damage from excessive heat.
Application Integration
This power supply module powers large S5 PLC rack systems with extensive I/O configurations. The main 5 VDC output supplies the CPU, memory modules, and backplane logic. The auxiliary 24 VDC output serves field devices like sensors and relays. The 6ES5951-7LB21 supports hot-swapping for replacement without system shutdown.
WeChat
Scan the QR Code with wechat