Abstract
Industrial networks are currently the only communication means designed for real-time systems used in industry. Networked control systems (NCS) are still important and commonly used type of such systems operating on shop floor. As a computerized node of NCS, a programmable logic controller (PLC) is usually used. In most cases, contemporary devices of such kind are equipped with more than one network interface of various types. Typically, only one interface is activated in NCS. Sometimes, the other is used for communication between NCS and supervisory systems. Occasionally, it is additionally involved in the data transmission in the factory IT systems. In general, however, using a single network interface is a more common solution. In this paper, the mutual utilization of more than one interface is discussed in order to back up the NCS network and to manage the node-related traffic within the scope of higher level services. The question of dependability of such a system from the electromagnetic compatibility point of view is discussed. The example is provided based on Profinet via wired and wireless connection.
Highlights
Networked control systems (NCS) is a well-known and commonly used architecture of computer-aided automation systems
Electromagnetic compatibility issues in hybrid wired and wireless industrial networks All in all, the authors present a technically-supported motivation for using all accessible interfaces of NCS controllers in order to increase system dependability as well as the possibility to add or modernize local services
Such setting produces a single measurement collection time of about 90 minutes. These parameters vary from the ones described in the 61000-4-3 and 61000-4-6 standards, where for example the frequency step size is equal to 1% of the previous frequency value
Summary
NCS is a well-known and commonly used architecture of computer-aided automation systems. The methods differ in terms of topology and the recovery time There is another standard, IEC 61499, prepared for designing and programming the distributed control systems (DCS) at a higher level of abstraction, without considering specific network interfaces but with the possibility of using multiple ones in the system. Such extra functions are turned off when they are available or are not even taken into consideration In particular cases, such additional network interfaces are used to build up integration of the given node with other systems. Electromagnetic compatibility issues in hybrid wired and wireless industrial networks All in all, the authors present a technically-supported motivation for using all accessible interfaces of NCS controllers in order to increase system dependability as well as the possibility to add or modernize local services. The conducted tests were long term and were carried out for different conditions (varying level and duration of the interference, different frequency range etc.)
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