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Module Overview
This power supply module delivers high output current for large S5-115U systems. You can install Siemens 6ES5955-5NB11 directly into the dedicated power slot of any S5-115U rack. The unit converts AC line voltage into stable DC power for backplane distribution. It supports CPU, I/O, and communication modules within the same chassis.
Technical Specifications
| Parameter | Value |
|---|---|
| Dimensions (W x H x D) | 250 mm x 25 mm x 130 mm |
| Weight | 0.85 kg |
| Input voltage range | 85V to 264V AC (universal) |
| Input frequency | 47 Hz to 63 Hz |
| Output voltage | 24V DC (regulated) |
| Output current rating | 10.0 A continuous |
| Output ripple | < 50 mV peak-to-peak |
| Output protection | Overcurrent, short-circuit, overvoltage |
| Efficiency | > 87% at full load |
| Hold-up time | 30 ms at 10A load |
| Status indicators | 1 green LED (output OK), 1 red LED (fault) |
| Interface to backplane | S5-115U rack backplane connector |
| Total onboard components | 205 discrete parts |
| Energy storage type | Large electrolytic capacitors |
| Energy storage rating | 3300 µF at 400V DC (primary) |
| Operating temperature | 0°C to +60°C |
Board Layout and Components
The PCB separates primary and secondary circuits with a reinforced isolation barrier. Large electrolytic capacitors store 3300 µF of energy on the primary side. Moreover, 205 discrete parts include switching MOSFETs and output regulation circuits. A passive heatsink covers the power components for convection cooling. Consequently, the module delivers stable power without external cooling fans.
Installation Process
You can mount Siemens 6ES5955-5NB11 into the dedicated power slot of any S5-115U rack. The backplane connector distributes 24V DC to all other rack modules automatically. Furthermore, the front panel includes a standard AC input terminal block. Green and red LEDs confirm output status and fault conditions clearly.
Performance Advantages
This module delivers 10 amps of continuous 24V DC output current. The 30 ms hold-up time bridges longer power interruptions successfully. Therefore, the PLC remains operational through extended brownout conditions. The built-in overvoltage protection also prevents rack damage from internal regulator failures.
Safety and Compliance
Siemens 6ES5955-5NB11 meets CE, UL, and RoHS standards. The primary capacitors take 90 seconds to discharge below 50V. Hence, technicians must wait 1.5 minutes before servicing internal components.