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Stable Power Delivery
The 6ES5951-7ND51 operates as a high-performance power supply module for the Siemens SIMATIC S5 programmable controller series. This unit converts AC mains voltage into stable DC power for the PLC backplane and connected I/O modules. It delivers a regulated 5 VDC output with substantial current capacity. The module also provides an auxiliary 24 VDC output for field devices. Consequently, it ensures reliable operation of the entire automation system.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Series | SIMATIC S5 |
| Category | Power Supply Module |
| Part Number | 6ES5951-7ND51 |
| Input Voltage | 120/230 VAC (selectable) |
| Input Frequency | 47-63 Hz |
| Output Voltage 1 | 5 VDC (main) |
| Output Current 1 | 20 A (5 VDC) |
| Output Voltage 2 | 24 VDC (auxiliary) |
| Output Current 2 | 1 A (24 VDC) |
| Power Rating | 150 W |
| Efficiency | 87% |
| Hold-up Time | 20 ms at 230 VAC |
| Protection Features | Overvoltage, short-circuit, overload |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Dimensions | Standard S5 double-width (25.0 cm x 10.0 cm x 11.0 cm) |
| Weight | 1.8 kg |
| Status Indicators | LEDs (5V OK, 24V OK, overvoltage fault) |
Protection and Monitoring Features
The 6ES5951-7ND51 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.
Application Integration
This power supply module powers the complete S5 PLC rack system. 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.