Product Overview

The Siemens 562-001​ is a high-performance, 32-bit central processing unit (CPU) module, famously known as the “Power Open Processor,” designed for the top-tier models of the Siemens Simatic S5 series, specifically the S5-135U and S5-155U programmable logic controllers. This processor represented a significant technological leap in its era, incorporating a powerful 32-bit architecture and a dedicated floating-point co-processor to handle complex computational tasks that were beyond the capability of standard 16-bit PLC CPUs. The Siemens 562-001​ serves as the core computational and control unit of the PLC system, executing the user-programmed automation logic, managing the system’s comprehensive I/O structure, handling communication with programming devices and networks, and providing system diagnostics. It is designed to manage large, complex automation projects that require fast processing speeds, extensive memory, and the ability to execute sophisticated mathematical and data handling operations, such as those found in process control, material handling, and large manufacturing lines.As the heart of the S5-135U/155U rack, the Siemens 562-001​ operates on a multi-processor backplane bus, allowing it to coordinate with additional co-processor modules for specialized functions like communications or additional calculation power. Its “Power Open” designation underscores its capability for “open” programming, supporting not only the standard STEP 5 languages (Statement List, Ladder Diagram, Function Block Diagram) but also high-level language programming in C or Pascal for particularly complex or algorithmically intensive functions. This made the Siemens 562-001​ uniquely suited for applications that blended classic sequential control with advanced computational tasks, such as recipe management, statistical process control, and complex closed-loop control. Its value was in providing a scalable, powerful, and versatile control platform that could serve as the central nervous system for the most demanding industrial automation systems of its time, offering a bridge between traditional PLC reliability and the power of a mini-computer.

Technical Specifications

Main Features and Advantages

The Siemens 562-001​ is distinguished by its raw computational power and architectural openness. The integration of a 32-bit CPU with a hardware floating-point unit was a groundbreaking feature, enabling it to execute complex mathematical operations—including trigonometric functions, logarithmic calculations, and real-number arithmetic—with unprecedented speed and precision for a PLC. This made it ideal for advanced process engineering tasks, model-based control, and data-intensive applications. Its support for high-level language programming (C/Pascal) allowed engineers to implement custom, optimized algorithms directly on the controller, providing a level of flexibility and performance that was unique in the PLC market at the time.System scalability and advanced communication are core strengths. The Siemens 562-001​ could serve as the master in a multi-processor configuration within the same rack, sharing the control load with other CPU or co-processor modules. It supported a vast and modular I/O system, allowing for the construction of extremely large automation systems. For communication, it provided the foundational MPI interface and, more importantly, could be equipped with a range of powerful communication processor (CP) modules for networks like SINEC L2 (PROFIBUS) and Industrial Ethernet, enabling seamless integration into plant-wide automation hierarchies. The CPU also featured a comprehensive diagnostic system, including a detailed diagnostic buffer that logged system events and errors, greatly simplifying troubleshooting and maintenance. The combination of brute-force processing, programming flexibility, and scalable architecture made the Siemens 562-001 Power Open Processor​ a legendary platform for tackling the most challenging automation problems.