ics protocols
0 5 flashcards patrykdastych
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master-slave
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master sends data to slave, it initiates communication(in client server the client initiates communication)
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PROFIBUS
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classical serial fieldbus, it is master-slave, zazwyczaj jest laczony liniowo(dlatego ma terminatory) terminatory - uklad rezystorow ktory dopasowuje impedancje do impedancji przewodu, we wtyczce dp9 mamy przelacznik terminujacy siec. rezystory zamienaja energie elektryczna na ciepło, zapobiegaja odbicia ktore powodowalyby zaklocenia profibus 32 interfejsy, profibus dp 126 interfejsow, predkosc max 12Mbp/s, domyslnie 1,5Mbp/s i 200m dp v0 cyclic dpv1 acyclic, v2 isochronous
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cyclic vs acyclic communication
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cyclic happens every cycle, every scan, every time slice meaning that data is exchanged at the regular pre determined time intervals, has higher priority and transmits critical data acyclic can wait, is not critical for example send some request and get answer
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PROFINET
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profinet is application layer, it is like http; it have 3 modes, tcp/ip(it runs udp), rt(real time), irt(isochronous real time, better real time) io-controller, io-device, io-supervisor(pc, hmi)
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arp
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you have ip and want to obtain mac address
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