Measurement of real-time aspects of Simatic/spl reg/ PLC operation in the context of physics experiments
H. Kleines, J. Sarkadi, F. Suxdorf, K. Zwoll
Abstract
H. Kleines, J. Sarkadi, F. Suxdorf, K. Zwoll
Abstract
Today, most slow control systems for physics experiments at Forschungszentrum Ju/spl uml/lich are implemented with Programmable Logic Controller (PLC) technology and fieldbus systems. In many cases, even deterministic response is required from the PLCs. This raises the question about the real-time performance that can be expected from a PLC. Response-time measurements of Simatic/spl reg/ PLCs-manufactured by the world market leader Siemens-are presented. Influence of program structure and hardware configuration on performance and deterministic behavior of a PLC is discussed.
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Today, most slow control systems for physics experiments at Forschungszentrum Ju/spl uml/lich are implemented with Programmable Logic Controller (PLC) technology and fieldbus systems. In many cases, even deterministic response is required from the PLCs. This raises the question about the real-time performance that can be expected from a PLC. Response-time measurements of Simatic/spl reg/ PLCs-manufactured by the world market leader Siemens-are presented. Influence of program structure and hardware configuration on performance and deterministic behavior of a PLC is discussed.
Key concepts: Simatic S5 PLC, Programmable logic controller, Context (archaeology), Siemens, Fieldbus, Controller (irrigation), Engineering, Control system