Product Overview
The Siemens 6ES5955-5LB11 operates as a dedicated power supply unit for the S5 series programmable logic controllers. This module converts AC line voltage into stable DC power for the entire rack system. Industrial control cabinets rely on this unit for consistent and noise-free electrical delivery.
Technical Specifications
This power supply module installs directly into the S5 central rack’s leftmost slot. The Siemens 6ES5955-5LB11 provides isolated outputs to protect sensitive logic circuits from mains disturbances. Its internal design incorporates short-circuit and overload protection features for enhanced system safety.
| Parameter | Specification |
|---|---|
| Product Type | Power Supply Module |
| Series Compatibility | Siemens S5 Series PLC |
| Dimensions (W x H x D) | 50 mm x 290 mm x 210 mm |
| Weight | Approximately 1.2 kg |
| Input Voltage | 120/230 V AC (selectable via switch) |
| Output Voltage | 5 V DC / 24 V DC (isolated) |
| Output Current (5V) | 5 A (for backplane logic) |
| Output Current (24V) | 1 A (for field devices or sensors) |
| Total Output Power | 49 W maximum |
| Energy Storage | Integrated 2200 µF capacitor maintains output during brief interruptions |
| Hold-up Time | Minimum 10 ms at full load |
| Efficiency | Typically 85% at nominal load |
| Protection Features | Short-circuit protection, overvoltage protection, overtemperature shutdown |
| Operating Temperature | 0°C to +60°C |
| Status Indicators | Green LED for output OK, red LED for fault |
Functional Capabilities
This unit accepts either 120 V or 230 V AC input through a rear selector switch. The Siemens 6ES5955-5LB11 then generates two independent DC output rails for distinct purposes. The 5 V rail powers all backplane logic modules and the CPU. Meanwhile, the 24 V rail supplies external sensors, relays, or small actuators directly.
The integrated electrolytic capacitor bank stores sufficient energy to bridge voltage dips. Consequently, the Siemens 6ES5955-5LB11 prevents unexpected CPU resets during momentary power fluctuations. The module’s switching topology delivers high efficiency and reduces heat generation inside control enclosures.
Installation and Mounting
Users slide this module into the designated slot without requiring additional mounting hardware. The Siemens 6ES5955-5LB11 connects to the backplane automatically upon insertion. Front-accessible terminals allow convenient wiring for AC input and DC output connections.
Application Scenarios
This power supply suits S5-based automation systems in manufacturing and process industries. Additionally, it integrates well with mixed I/O configurations requiring both logic and field power. The module provides a reliable foundation for critical control loops where uptime matters.
Details
| Weight | 1.2 kg |
|---|---|
| Dimensions | 50 × 290 × 210 mm |
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