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Nowadays, computer systems are presented in almost all types of human activity and they support any kind of industry as well. Most of these systems are distributed where the communication between nodes is based on computer networks of any kind. Connectivity between system components is the key issue when designing distributed systems, especially systems of industrial informatics. The industrial area...
This paper deals with Real-Time applications based on Profinet IO Real-Time Class 3. The industrial automation in some cases requires the precision of IO data timing well below the delivered cycle time on the bus. When using the Isochronous Real-Time protocol of Profinet, one single predefined time within a cycle time can be chosen for the inputs- and outputs. The work presented here, shows how the...
PROFINET IO is designed with a modular structure of the IO devices. Certified modular PROFINET IO devices are usually shipped with a General Station Description (GSD) file that does not contain the actual module configuration of the IO device. With common appliances the modules must subsequently be configured manually in the engineering tool. This can become an elaborate task in large PROFINET IO...
The use of Ethernet based solutions in automation applications opens new possibilities for the integration of new functionalities. But one of the critical point is the availability of the communication system. This paper gives an overview of the Media Redundancy Protocol (MRP) as defined in IEC 62439 and some adaptations needed to support the Profinet IO Real-Time (RT) protocol.
The use of Ethernet based solutions in automation applications raises the question of test tools. Free tools like Wireshark, formerly known as Ethereal, are available and offer decoding of real-time Ethernet like PROFINET IO. But is such a software based tool able to measure the required real-time constraints? What are the limits of such software based measurements? This report gives an overview of...
A Profinet IO Network of Class A uses standard Ethernet network components. If these network components can be attacked by e.g. a man-in-the-middle attack, this is also the case for Profinet IO. This paper outlines these possibilities and shows, how this may be used to build IO-Device emulators for system-testing.
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