Siemens 6ES5931-8MD11 Power Supply

Reliable DC Power for Your S5 Rack

This power supply module provides stable 24V DC output for your SIMATIC S5 system. The Siemens 6ES5931-8MD11 converts AC line voltage into regulated DC power. It supplies up to 2A of continuous current to all backplane modules. A green LED indicates normal operating status on the front panel. Consequently, this unit ensures reliable system operation in industrial environments.

Input & Output Specifications

The Siemens 6ES5931-8MD11 accepts a wide input voltage range from 85V to 264V AC. This flexibility allows global deployment without voltage selection switches. The module delivers a steady 24V DC output with minimal ripple. You can connect external 24V loads directly to the front terminals. Furthermore, built-in overload protection prevents damage during short circuits.

Parameter	Detailed Specification
Dimensions (H x W x D)	13.5 cm x 4.5 cm x 10.0 cm
Weight	0.35 kg (0.77 lbs)
Input Voltage Range	85V to 264V AC (50/60 Hz)
Output Voltage	24V DC regulated
Output Current	2A continuous
Output Power	48W
Ripple	< 50 mV peak-to-peak
Number of Output Terminals	2 screw-type (24V+, 0V)
Status Indication	1 green LED (output OK)
Protection Features	Overload and short-circuit protection
Energy Storage	Built-in 470 µF capacitor for hold-up time

Installation & Wiring Guidelines

You insert the Siemens 6ES5931-8MD11 into any standard S5 rack slot. The module connects directly to the backplane bus for internal power distribution. You then wire AC input to the dedicated L and N terminals. For DC output, you connect your devices to the 24V+ and 0V terminals. Always use properly sized wires for safe operation.

Operational Advantages & Reliability

The built-in capacitor stores enough energy for brief power interruptions. This feature prevents system resets during momentary line dips. The module also runs quietly without any cooling fan. Therefore, this Siemens power supply offers years of maintenance-free service in control cabinets.