Description

The Siemens 6ES5928-3UA21 (CPU 928A) is a high-performance central processing unit module engineered for use within the SIMATIC S5-135U and S5-155U programmable logic controller systems. This module is specifically designed to support multi-processor configurations, enabling complex control algorithms and high-speed arithmetic processing in demanding industrial environments. By offloading specific bit and word execution tasks, the CPU 928A ensures deterministic cycle times and maintains system stability in critical applications such as power generation, chemical processing, and heavy manufacturing.

Features

• Dual-processor architecture for independent handling of binary and word-based mathematical operations.
• Optimized for multi-processor backplane communication, allowing up to four CPUs to operate in parallel without memory contention.
• Integrated slot for interchangeable EPROM or RAM memory submodules.
• Front-panel status LED array for real-time diagnostics, including battery health, synchronization status, and operational mode.
• Standardized programming interface for rapid configuration and troubleshooting.

Applications

The CPU 928A is primarily utilized in large-scale automation systems requiring high availability and complex logic processing. It is a standard component for S5-135U and S5-155U racks where multiple processors are required to manage dense I/O counts and high-speed control loops.

Technical Specifications

Installation Guidelines

• Ensure the PLC rack is powered down before inserting or removing the CPU module to prevent electrical damage or backplane bus errors.
• Verify that the module is correctly seated in the designated CPU slot; ensure the backplane connector pins are aligned and fully engaged.
• Handle the module using proper ESD (Electrostatic Discharge) precautions to protect sensitive internal circuitry.
• Maintain adequate ventilation within the control cabinet to keep ambient temperatures within the 0 to 60 deg C operating range.
• Route communication cables away from high-voltage power lines to minimize EMI (Electromagnetic Interference) risks.

FAQ

Is the 6ES5928-3UA21 compatible with all S5 racks?

This module is designed specifically for the SIMATIC S5-135U and S5-155U series. It is intended for multi-processor environments and should be used in accordance with the specific rack configuration requirements for these systems.

What is the recommended replacement for this module?

The official successor component for this CPU is the 6ES5928-3UB21. Please verify your system's specific requirements before performing a hardware upgrade.