PLCs, Power Supplies & Others

The Siemens 6ES5956-0AA12 power supply module delivers stable DC power to SIMATIC S5 CPU and I/O modules. This compact unit converts AC mains into regulated voltages for backplane distribution. Its housing measures 140 mm in height, 30 mm in width, and 135 mm in depth.

Technical Specifications

Input Power and Voltage Compatibility

The Siemens 6ES5956-0AA12 accepts a 230 V AC input with a tolerance of ±15%. The unit operates across a frequency range from 47 to 63 Hz for global compatibility. This wide input range covers standard European and Asian mains supplies. A 4.0 A fuse protects the module against input overcurrent events and short circuits.

Output Capabilities and Power Distribution

This power supply delivers 5 V DC at 6.0 A for backplane and module logic circuits. A separate 24 V DC output provides 0.5 A for external sensors and auxiliary devices. The total output power reaches 30 W for supporting multiple modules in a single rack. Such capacity suits typical SIMATIC S5 configurations with CPU and I/O modules.

Energy Storage and Output Filtering

An internal 1,000 µF capacitor bank filters the outputs to reduce electrical noise effectively. This capacitance ensures stable voltage during load changes and brief power dips. Output ripple stays below 50 mV peak-to-peak for noise-sensitive digital circuits. Clean power delivery ensures reliable operation of processing and communication modules.

Protection Systems and Fault Handling

The Siemens 6ES5956-0AA12 includes comprehensive protection for both the supply and connected loads. Overcurrent protection limits each output to prevent damage during overload events. Short-circuit protection automatically disconnects outputs to safeguard the power electronics. The module resets automatically after clearing the fault condition.

Efficiency and Thermal Performance

The module achieves 85% efficiency, reducing wasted power and minimizing heat generation. This efficiency allows operation without forced-air cooling in most industrial environments. The aluminum heatsink conducts heat away from power components effectively. The unit operates reliably across the full 0°C to 60°C temperature range without derating.

Installation and Mounting

Mount the Siemens 6ES5956-0AA12 on a standard 35 mm DIN rail using the integrated clip mechanism. Position the unit at the rightmost slot of the S5 rack for optimal power distribution. The 6-pin screw terminal block accepts wire gauges from 0.5 to 2.5 mm². Secure the connections firmly to prevent voltage drops or heating.

Component Quality and Hardware Design

This PCB contains 48 components, including switching transistors, transformers, and filter capacitors. The board uses through-hole technology for robust mechanical strength and reliability. A protective conformal coating shields the circuitry from dust and humidity. The housing meets UL 94 V-0 flammability standards for fire safety compliance.

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