Description

The Siemens 6ES5951-7ND41 is a high-reliability power supply module designed for the Simatic S5-115U, S5-115H, and S5-115F programmable logic controller (PLC) systems. This unit provides regulated, galvanically isolated DC power to the PLC backplane, ensuring stable operation and protecting sensitive processor and I/O modules from electrical noise and voltage fluctuations. It is an essential component for maintaining legacy S5 automation infrastructure in demanding industrial environments.

Features

• System Compatibility: Specifically engineered for the Siemens Simatic S5-115 series.
• Flexible Output Capacity: Supports 7 A at 5 VDC with standard convection cooling, or up to 15 A at 5 VDC when utilized with an active fan subassembly.
• Electrical Isolation: Provides galvanic isolation between the primary input and secondary output rails to enhance system safety and noise immunity.
• Data Retention Support: Features slots for two AA-size lithium batteries (6ES7971-0BA00) to ensure RAM data retention during power-off states.
• Input Range: Operates on a DC input voltage range of 19.2 to 30 VDC.

Applications

This power supply is intended for use in S5-115U, S5-115H, and S5-115F rack configurations. It is widely deployed in heavy manufacturing, water treatment facilities, and critical infrastructure control systems where consistent power delivery is required to prevent logic errors and system resets.

Technical Specifications

Installation Guidelines

• Safety First: Always disconnect the primary power source before installing or removing the module from the S5 rack.
• Mounting: Ensure the module is fully seated in the designated rack slot to maintain proper electrical contact with the backplane.
• Cooling: If the application requires the 15 A output capacity, ensure the active fan assembly is correctly installed and unobstructed to prevent thermal shutdown.
• Grounding: Follow standard industrial grounding practices to ensure the chassis is properly bonded to the system earth.
• Battery Handling: When installing backup batteries, ensure correct polarity to prevent data loss or potential damage to the memory circuit.

FAQ

Q: Does this power supply include the backup batteries?
A: No, the batteries (6ES7971-0BA00) are typically sold separately. The unit provides the housing and interface for two AA-size lithium batteries.

Q: Can I use this in an S5-135U system?
A: No, this module is specifically designed for the S5-115 series. Please verify your rack model before installation.