Programabilni logički kontroleri PLC program i primeri primene

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1 Programabilni logički kontroleri PLC program i primeri primene Industrijski sistemi i protokoli - predavanje 3 Ver

2 Sadržaj 1. Osnove kontaktorskih šema (mirno i radno, tasteri, kontakti i PLC bitovi 2.Lestvičasti (ladder) dijagram za programiranje PLC 3. Blokovi ladder dijagrama 4. Primeri Ladder dijagrama 5. Primena u elektromotornim pogonima PLC Industrijski sistemi i protokoli 2/30

3 Normalno otvoren (radni) i zatvoren (mirni)? Tasteri Šta je radno stanje, akcija, nenormalno stanje kod tastera? To je pritisak na taster! Radni tester vodi u radnom stanju, a normalno (kada ga ne pritiskamo) je otvoren normalno otvoren. Tako mu definiše i sam grafički simbol i NO. Mirni tester vodi u neradnom stanju, koje je normalno jer ga ne pritiskamo, on je normalno zatvoren. Tako mu definiše i sam grafički simbol i NC. Suština ovde je da su vas pogrešno učili 1) da je normalno da ne radimo. 2) da smo mirni samo kad ne radimo. PLC Industrijski sistemi i protokoli 3/30

4 Normalno otvoren (radni) i zatvoren (mirni)? Rele A radni (NO) A mirni (NC) Kontaktor A A namotaj elmagneta (špulna) glavni kontakti pomoćni kontakti PLC Industrijski sistemi i protokoli 4/30

5 Normalno otvoren (radni) i zatvoren (mirni)? Moderni kontaktori PLC Industrijski sistemi i protokoli 5/30

6 Normalno otvoren (radni) i zatvoren (mirni)? Princip rada kontaktora Nema napona na namotaju, el. magnet ne radi, nema privlačenja kotve, kontakti razdvojeni. Napon na namotaju,elmagnet Privlači se kotva, kontakti zatvoreni PLC Industrijski sistemi i protokoli 6/30

7 Normalno otvoren (radni) i zatvoren (mirni)? Kontakti releja ili kontaktora Šta je radno stanje, akcija, nenormalno stanje kod releja/kontakotora? To je napon na špulni! Radni kontakt vodi u radnom stanju, a normalno (kada nema komande) je otvoren normalno otvoren. Tako mu definiše i sam grafički simbol i NO. Mirni kontakt vodi u neradnom stanju, koje je normalno jer kad nema napona, on je normalno zatvoren. Tako mu definiše i sam grafički simbol i NC. Eneg. ka mreži Špulna(komanda) pomoćni radni (NO, 34) Energ. ka potrošaču pomoćni mirni (NC,12) PLC Industrijski sistemi i protokoli 7/30

8 Normalno otvoren (radni) i zatvoren (mirni)? Bitovi u PLC Šta je radno stanje, akcija, neaktivno, nenormalno stanje kod bitova? To je stanje 1, stanje ON! Radni bit vodi u radnom stanju (1), a normalno (kada nije 1) je otvoren normalno otvoren kontakt. Mirni bit vodi u neradnom stanju (0),normalnom stanju on je normalno zatvoren kontakt. Bit može biti ulaz (na primer I0.0) koji je 1 ako je napon na ulazu, ili izlaz (na primer Q0.0) koji je 1 ako je napon na izlazu, ili čak i samo bit iz memorije (na primer M0.0) koji je 1 ako je prethodno setovan ili 0 ako je prethodno resetovan. PLC Industrijski sistemi i protokoli 8/30

9 Primeri sa PLC Ladder dijagramima

10 Način programiranja PLC Siemens S7 Lestvičasta logika (ladder logic) je način crtanja el. logičkih šema. To je grafički jezik, veoma popular kod PLC. Originalno je izmišljen da zameni relejnu logiku. Ime je dobio jer program podseća na merdevine. Alternativa STL (statment list) - Instruction List language LD start_taster O izlaz A stop_taster = izlaz PLC Industrijski sistemi i protokoli 10/30

11 Način programiranja PLC Siemens S7 Stara relejna šema (napajanje, žice, špulne, mirni i radni kontakti releja) Lestvičasti PLC programi koji zamenjuju ovu šemu PLC Industrijski sistemi i protokoli 11/30

12 PLC S7-200 ciklus izvršenja programa PLC Industrijski sistemi i protokoli 12/30

13 PLC: Osnovni blokovi Ladder dijagrama

14 PLC S7 - tipovi podataka, bitovi i bajtovi Informativno PLC Industrijski sistemi i protokoli 14/30

15 PLC S7 - tipovi podataka, word i double word Informativno PLC Industrijski sistemi i protokoli 15/30

16 PLC S7 osnovni Ladder blokovi - Kontakti The Normally Open contact is closed (on) when the bit is 1. The Normally Closed contact is closed (on) when the bit is 0. Rade sa ulaznim bitovima I0.0.. Izlaznim bitovima Q0.0.. i memorisanim bitovima M PLC Industrijski sistemi i protokoli 16/30

17 PLC S7 osnovni Ladder blokovi set/reset Radi sa Izlaznim bitovima Q0.0.. i memorisanim bitovima M The Set (S) and Reset (R) instructions set (turn on) or reset (turn off) the specified number of points (N), starting at the specified address (Bit). Tipically, N=1. You can set or reset from 1 to 255 points. If the reset specifies either a timer bit (T) or counter bit (C), the instruction resets the timer or counter bit and clears the current value of the timer or counter. PLC Industrijski sistemi i protokoli 17/30

18 PLC S7 osnovni Ladder blokovi MOV Dodela vrednosti, MOV instrukcija Informativno The Move Byte (MOVB) instruction moves the input byte (IN) to the output byte (OUT) without changing the original value. The Move Word (MOVW) instruction moves the input word (IN) to the output word (OUT) without changing the original value. Ove dve instrukcije ćete često koristiti da podesite neki komunikacioni modul povezan sa, ili unutar PLC! Na primer registar za baud rate postavi na 9600! IN povežemo sa 9600 i povučemo liniju ka EN (dozvolimo upis) PLC Industrijski sistemi i protokoli 18/30

19 PLC S7 osnovni Ladder blokovi FOR and NEXT Kontrola toka programa, FOR and NEXT Informativno The FOR (FOR) instruction executes the instructions between the FOR and the NEXT. You specify the index value or current loop count (INDX), the starting value (INIT), and the ending value (FINAL). The NEXT (NEXT) instruction marks the end of the FOR loop, and sets the top of the stack to 1. PLC Industrijski sistemi i protokoli 19/30

20 PLC S7 osnovni Ladder blokovi JMP and LBL Kontrola toka programa, JMP and LBL Informativno The Jump to Label (JMP) instruction performs a branch to the specified label (n) within the program. When a jump is taken, the top of stack value is always a logical 1. LBL is the program jump point. PLC Industrijski sistemi i protokoli 20/30

21 PLC S7-200 podprogram (subroutine) Informativno When the main program calls the subroutine for execution, the subroutine carries out its program to its end. Then, the system returns control to the main program at the network from which the subroutine was called. Call Parameter Type Description IN Parameters are passed into the subroutine. If direct address (such as VB10), the value at the specified location is passed into the subroutine. If data constant (16#1234), or an address (&VB100), the constant or address value is passed into the subroutine. IN_OUT The value at the specified parameter location is passed and the result value from the subroutine is returned to the same location. OUT The result value from the subroutine is returned to the specified parameter location. TEMP Any local memory that is not used for passed parameters may be used for temporary storage within the subroutine. PLC Industrijski sistemi i protokoli 21/30

22 PLC S7-200 Prekid (interrupt) S7-200 PLCs incorporate instructions for use with interrupts. Interrupts are used to initiate a specific, short PLC program segment, called an interrupt routine, when an internal or external event occurs. After the interrupt routine has been executed, control is returned to the main program. Three types of interrupts are supported by S7-200 PLCs, communication port interrupts, I/O interrupts, timebased interrupts. Informativno Communication port interrupts are used to control a communication port operated in Freeport mode. I/O interrupts are used to respond quickly to high-speed I/O transitions, such as those associated with high-speed counters or pulse train outputs. Time-based interrupts allow the user program to execute an interrupt routine on a cyclic basis. Each of these types of interrupts has an associated priority that determines which interrupt is processed first in the event that two or more interrupts are requested at the same time. Communication port interrupts have the highest and time-based have the lowest priority. PLC Industrijski sistemi i protokoli 22/30

23 PLC S7-200 Prekid (interrupt) 1. Prekid (interrupt, u PLC svetu često zvan dogañaj ili event) se opslužuje nezavisno od periodičnog PLC ciklusa skeniranja. 2. Kod prekida treba definisati dve stvari Izvor prekida Podprogram koji treba izvršiti kada se desi prekid Informativno 3. Te dve stvari treba spojiti, ATTACH blok! ATTACH blok kaže pridruži ovaj podprogram (interrupt routine) sa onim interuptom ili dogañajem (event) 4. Ponekad treba redefinisati akciju, onda prvo moramo razdvojiti rutine od dogañaja, za to služi DTCH blok Naravno, dogañaj (prekid) treba dozvoliti (ENI ) ili po potrebi zabraniti (DISI). U startu je većina zabranjena. PLC Industrijski sistemi i protokoli 23/30

24 PLC S7-200 Prekid (interrupt) ATCH traži i ime podprograma za izvršenje, koji treba povezati sa tim dogañajem The Enable Interrupt (ENI) instruction globally enables processing of all attached interrupt events. Informativno The Disable Interrupt (DISI) instruction disables processing of all interrupt events. The Attach Interrupt (ATCH) instruction associates an interrupt event (EVNT) with an interrupt routine number (INT), and enables the interrupt event. The Detach Interrupt (DTCH) instruction disassociates an interrupt event (EVNT) from all interrupt routines, and disables the interrupt event. ATCH traži broj dogañaja tj prekida DTCH odvaja dogañaja od svih rutina. Ne mora da zna koja je bila priljučena tom dogañaju, sve ubija! PLC Industrijski sistemi i protokoli 24/30

25 PLC S7-200 Prekid (interrupt) Informativno Tabela Event-a za PLC S200 (nepotpuna) PLC Industrijski sistemi i protokoli 25/30

26 PLC S7-200 Osnovni blokovi Ladder dijagrama Floating point matematika IN1 + IN2 = OUT IN1 - IN2 = OUT (nije prikazano) IN1 * IN2 = OUT IN1 / IN2 = OUT Itd.. PLC Industrijski sistemi i protokoli 26/30

27 PLC: Timer and Counter

28 PLC S7-200 tajmerski blokovi The On-Delay Timer (TON) instruction counts time when the enabling input is ON. When the current value (Txxx) is greater than or equal to the preset time (PT), the timer bit is ON. The On-Delay timer current value is cleared when the enabling input is OFF. This timer continues counting after the Preset is reached, and it stops counting at the maximum value of TON, TONR, and TOF timers are available in three resolutions. The resolution is determined by the timer number as shown in the chart below. Each count of the current value is a multiple of the time base. For example, a count of 50 on a 10-ms timer represents 500 ms. Timer Type Resolution Maximum Value Timer Number TONR 1 ms s T0, T64 10 ms s T1-T4, T65-T ms s T5-T31, T69-T95 TON, TOF 1 ms s T32, T96 10 ms s T33-T36, T97-T ms s T37-T63, T101-T255 PLC Industrijski sistemi i protokoli 28/30

29 PLC S7-200 tajmerski blokovi The On-Delay Timer (TON) instruction counts time when the enabling input is ON. When the current value (Txxx) is greater than or equal to the preset time (PT), the timer bit is ON. The On-Delay timer current value is cleared when the enabling input is OFF. The On-Delay Timer (TON) time diagram PLC Industrijski sistemi i protokoli 29/30

30 PLC S7-200 tajmerski blokovi The Retentive On-Delay Timer (TONR) instruction counts time when the enabling input is ON. When the current value (Txxx) is greater than or equal to the preset time (PT), the timer bit is ON.The current value of the Retentive On-Delay timer is maintained when the input is OFF. You can use the Retentive On-Delay timer to accumulate time for multiple periods of the input ON. A Reset instruction (R) is used to clear the current value of the TONR. PLC Industrijski sistemi i protokoli 30/30

31 PLC S7-200 tajmerski blokovi The Off-Delay Timer (TOF) is used to delay turning an output OFF for a fixed period of time after the input turns OFF. When the enabling input turns ON, the timer bit turns ON immediately, and the current value is set to 0. When the input turns OFF, the timer counts until the elapsed time reaches the preset time. When the preset is reached, the timer bit turns OFF and the current value stops counting. If the input is OFF for a time shorter than the preset value, the timer bit remains ON. The TOF instruction must see an ON to OFF transition to begin counting. PLC Industrijski sistemi i protokoli 31/30

32 PLC S7-200 brojački blokovi (counter Down) The Count Down (CTD) counts down from the current value of that counter each time the count down input CD makes the transition from off to on. When the current value Cxxx is equal to zero, the counter bit (Cxxx) turns on. The counter resets the counter bit (Cxxx) and loads the current value with the preset value (PV) when the load input (LD) turns on. The Down Counter stops counting when it reaches zero, and the counter bit Cxxx turns on. Counter Down time diagram PLC Industrijski sistemi i protokoli 32/30

33 PLC S7-200 brojački blokovi (counter) The Count UP Down (CTUD) counts up each time the count-up input CU makes the transition from off to on, and counts down each time the countdown input CD makes the transition from off to on. The current value Cxx of the counter maintains the current count. The preset value PV is compared to the current value each time the counter instruction is executed. Upon reaching maximum value (32,767), the next rising edge at the count-up input causes the current count to wrap around to the minimum value (-32,768). On reaching the minimum value (- 32,768), the next rising edge at the count-down input causes the current count to wrap around to the maximum value (32,767). When the current value Cxx is greater than or equal to the preset value PV, the counter bit Cxx turns on. Otherwise, the counter bit turns off. The counter is reset when the Reset (R) input turns on. PLC Industrijski sistemi i protokoli 33/30

34 PLC S7-200 brojački blokovi (counter) The Count Up (CTU) instruction counts up from the current value each time the count-up input CU makes the transition from off to on. When the current value (Cxxx) is greater than or equal to the Preset Value (PV), the counter bit (Cxxx) turns on. The counter is reset when the Reset (R) input turns on, or when the Reset instruction is executed. The counter stops counting when it reaches the maximum value (32,767). PLC Industrijski sistemi i protokoli 34/30

35 Zasto brojaci? - Senzori sa impulsnim izlazom Velicina koju merimo R, C, L... Element na čije parametre merna veličina utiče Senzor Elektronsko Prilagodno kolo Izlaz V, I, f... R El. kolo v(t) A/D PLC C El. kolo v(t) brojač PLC Industrijski sistemi i protokoli 35/30

36 Klasična veza senzora sa PLC ili mikroprocesorom Analogni signal + AD konvertor (analogni PLC ulaz) Analogni pretvoren u impulsni signal + brojački PLC ulaz Izvorno impulsni signal + brojački PLC ulaz PLC Industrijski sistemi i protokoli 36/30

37 Primer prostih impulsnih senzora Princip rada impulsnih svetlosnih senzora Predajnik, svetlosni izvor, šalje svetlost u pravcu prijemnika. Prijemnik menja stanje izlaza svaki put kada se svetlosni snop prekine. + + PLC Industrijski sistemi i protokoli 37/30

38 Optički senzori primeri primene PLC Industrijski sistemi i protokoli 38/30

39 Primer slozenih impulsnog senzora Incremental encoder Inkrementi položaja dspic A B index Quadrature Encoder n θm = 2π N Reset, definiše apsolutni položaj PLC Industrijski sistemi i protokoli 39/30

40 Primeri Ladder dijagrama

41 PLC S7-200 samodržanje Pritisnut normalno otvoren start_taster i nepritisnut normalno zatvoren stop_taster uključuju izlaz. Zatim, izlaz samog sebe drži sve dok neko ne pritisne stop_taster Ovo važi u slučaju da se koriste dva radna tastera. 24 V start_taster stop_taster I0.1 I0.2 PLC PLC Industrijski sistemi i protokoli 41/30

42 PLC S7-200 samodržanje industrija Pritisnut normalno otvoren start_taster i nepritisnut (ali provodan) normalno otvoren stop_taster uključuju izlaz. Zatim, izlaz samog sebe drži sve dok neko ne pritisne stop_taster Ovo važi u slučaju da se za stop koriste mirni taster! Na primer, podnaponska sklopka dok ima napona drži stop provodnim, ako napon nestane, stop izbacuje pogon. 24 V start_taster I0.1 stop_taster PLC I0.2 PLC Industrijski sistemi i protokoli 42/30

43 Primena PLC u pogonima

44 Primena PLC pri kontroli motora bimetal Šema pre pojave PLC kontaktor Logika je rešena relejima, špulnama i pomoćnim kontaktima kontaktora (svi na različitim naponima) koji su povezani velikim brojem žica. Promena logičke napon funkcije i proširenja su bila gotovo nemoguća. CR rele (špulna i kontakt) M kontaktor-motor starter (špulna i trofazni energetski kontakti) OL trofazni bimetal i pomoćni mirni kontakt) Start taster Rele PLC Industrijski sistemi i protokoli 44/30

45 Primena PLC pri kontroli motora Ovoga se nećemo rešiti ni sa PLC 2. Tasteri (HMI) 1. Motor starter, aktuator, prenosi snagu ALi, želimo da sve ostalo ( i mnogo više) radi PLC PLC Industrijski sistemi i protokoli 45/30

46 Primena PLC pri kontroli motora snaga Komanda (za novu komandu treba nam samo novi taster) Logika (lako se menja i proširuje po potrebi) PLC Industrijski sistemi i protokoli 46/30

47 Primena PLC pri kontroli motora Tipovi lokalnih komanda ka PLC Radni taster Normalno otvoren Mirni taster Normalno zatvoren Normalno otvoren prekidač Normalno zatvoren prekidač Radni kontakt Normalno otvoren Mirni kontakt Normalno zatvoren +24V PLC Industrijski sistemi i protokoli 47/30

48 Primena PLC pri kontroli motora Motor radi, Q0.0 se samodrži, stop i bimetal nisu aktivni PLC Industrijski sistemi i protokoli 48/30

49 Proširenje aplikacije svetlosni indikatori snaga Dodatni svetlosni indikatori Komanda (za novu komandu treba nam samo novi taster) Logika (lako se menja i proširuje po potrebi) PLC Industrijski sistemi i protokoli 49/30

50 Proširenje aplikacije svetlosni indikatori Prosto rešenje. Novi kod i dve nove linije iz PLC PLC Industrijski sistemi i protokoli 50/30

51 Motor starter PLC Industrijski sistemi i protokoli 51/30

52 Druge aplikacije kontaktora i PLC PLC Industrijski sistemi i protokoli 52/30

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