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Performance of HTTP Protocol in
Networked Control Systems
Abstract
Integration of Networked Control Systems is always an engineering
challenge. Heterogeneous hardware and software environments combined with
long lifetime of control systems makes this job particularly troublesome. Modern
concepts of integration of automation systems are related to Service Oriented
Architecture (SOA). While its suitability is proven in IT systems, SOA has not been
adopted yet in commercial Programmable Logic Controllers (PLC), and thus cannot
be considered as a solution for integration with already deployed control systems.
However, during past years thousands of PLCs with embedded HTTP servers were
deployed in the field. These devices, used together with modern PLC that acts as
the HTTP client, enable unique opportunity of integration for control systems with
soft real-time constraints. In the present study, the performance of PLC-to-PLC
communications based on HTTP is evaluated and compared to Modbus TCP.