The Siemens 6ES5955-5LB11 is a robust power supply unit specifically designed for the Simatic S5-135U and S5-155U programmable logic controller systems. This module serves as a critical component in maintaining stable power distribution across the PLC backplane, ensuring consistent operation in demanding industrial environments where electrical stability is paramount.
Features
Designed for integration with Siemens S5-135U and S5-155U automation racks.
Selectable input voltage range (115 VAC or 230 VAC) for versatile field application.
Integrated protection circuitry guarding against short-circuit and overvoltage conditions.
Front-mounted diagnostic LEDs for immediate visual monitoring of input status and output voltage health.
Engineered for high-reliability operation in harsh industrial sectors, including manufacturing and process control.
Applications
This power supply module is intended for use in legacy Simatic S5 automation systems. It is commonly deployed in heavy industrial environments such as water treatment facilities, automotive production lines, and chemical processing plants where maintaining uptime for the S5 controller rack is essential for process continuity.
Technical Specifications
Model
6ES5 955-5LB11
Brand
Siemens
Input Voltage
115 VAC / 230 VAC (Selectable)
Input Frequency
47 to 63 Hz
Output Voltage
5 VDC and 24 VDC
Output Current
10 A at 5 VDC
Operating Temperature
0 to 60 deg C
Storage Temperature
-40 to 70 deg C
Cooling
Natural Convection
Installation Guidelines
Ensure the power source is fully disconnected before attempting to install or remove the module from the rack.
Verify that the input voltage selection matches the local supply grid (115V or 230V) prior to energizing the unit.
Maintain adequate clearance around the module to allow for natural convection cooling; do not obstruct the ventilation paths.
Ensure the module is securely seated in the rack backplane to prevent intermittent connection issues.
Handle with standard ESD precautions to protect internal electronics during installation.
FAQ
What systems is the 6ES5955-5LB11 compatible with?
This power supply is specifically designed for the Siemens Simatic S5-135U and S5-155U PLC platforms.
Is this module field-selectable for different input voltages?
Yes, the unit supports selectable input voltages of 115 VAC or 230 VAC to accommodate different facility power requirements.
What is the primary function of the front panel LEDs?
The LEDs provide real-time diagnostic feedback regarding the presence of input power and the status of the regulated output voltage rails.
