Abstract
In this paper LPC1766 microcontroller based network capable application processor (NCAP) system, is described. This system is intended to be used in modern distributed control and monitoring systems for application in power plants and industry, as well as in modern electricity distribution networks. In order to do that it is necessary to analyze different aspects of the system, like signal processing part or communication requirements. The chosen microcontroller has enough resources to satisfy requirements of an transducer interface module (TIM). Beside the realization of NCAp and TIM controllers it is necessary to develop the necessary measurement modules, in order to realize measurement-control systems. The developed layout could be connected to actuators to the local area network (LAN), as well. If the local LAN is connected to the internet it is possible to monitor and configure measurement modules form the remote site. Having in mind the growing complexity in control systems, it has been a real challenge to detect a diagnose problems in today's large scale distributed systems. Implementation of the proposed module could potentially reduce the time necessary to extract necessary information from the abundant quantity of information that are usually provided by the complex distributed systems.
Highlights
The developed layout could be connected to actuators to the local area network
If the local local area network (LAN) is connected to the internet
[8] „IEEE Standard for a Smart Transducer Interface for Sensors and Actuators – Network Capable Application Processor Information Model” Institute of Electrical and Electronics Engineers Standards Association (IEEE-SA), 1999
Summary
Pojavom digitalnih računara nastala je ideja digitalnog prenosa (razmene) podataka između računara. Iz OSI modela, između ostalih, razvijen je TCP/IP protokol koji se može smatrati de facto standardom u mrežama sa komutacijom paketa. Internet sloj obezbeđuje rutiranje paketa između čvorova koji se nalaze u različitim mrežama. Na predajnoj strani aplikativni sloj prosledi podatke transportnom sloju, transportni sloj doda svoje zaglavlje (za razumevanje principa transporta podataka najvažniji podaci su brojevi izvorišnog i odredišnog logičkog porta) i tako dobijeni segment, prosledi Internet sloju, Internet sloj dalje dodaje svoje zaglavlje u kome se nalaze IP adrese čvora primaoca i čvora pošiljaoca i dobijeni paket (datagram) prosleđuje pristupnom sloju, pristupni sloj ponovo dodaje svoje zaglavlje, koje je sačinjeno od izvorišne i odredišne MAC adrese i bita za proveru prenosa, i tako formirani okvir (frame) dovodi na fizički interfejs čvora, preko koga se podaci u obliku signala kroz odabrani medijum prenose do sledećeg čvora. Povećanjem pouzdanosti i brzine prenosa mrežne tehnologije su postale prihvatljivo rešenje komunikacije u industrijskim pogonima
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