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</o:shapelayout></xml><![endif]--></head><body lang=IT link=blue vlink=purple><div class=WordSection1><div><div id="yui_3_16_0_ym19_1_1483107967020_3876"><div style='mso-element:para-border-div;border:none;border-bottom:solid windowtext 1.5pt;padding:0cm 0cm 1.0pt 0cm;background:white'><p class=MsoNormal style='background:white;border:none;padding:0cm'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>Venerdì 30/12/2016 Piergiorgio Pancino a scritto<o:p></o:p></span></p></div><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>I PLC sono microcontrollori e come tali non utilizzano thread.<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3876"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3877"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>Il ciclo viene gestito in pratica con una programmazione asincrona, semplicemente ripetuto in maniera banale:<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3878"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>1) Controllo tutti gli ingressi<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>2) Eseguo le operazioni di elaborazione (AND OR e controllo delle temporizzazioni)<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>4) Attivo le uscite interessate<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>Per gestire le temporizzazioni in maniera semplice basta fare un confronto con il tempo, ad esempio nel seguente codice eseguo operazioni varie<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>a due intervalli di tempo prestabiliti:<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>mio_intervallo_1 = 1 # 1 secondo<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>mio_intervallo_2 = 1 # 0.5 second1<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>orario_partenza_evento_1 = time.time()<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>orario_partenza_evento_2 = time.time()<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>while(True)<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'> if (time.time() - orario_partenza_evento_1 > mio_intervallo_1):<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'> eseguo_quello_che_voglio_1() <o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'> orario_partenza_evento_1 = time.time() <o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_4836"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'> if (time.time() - orario_partenza_evento_2 > mio_intervallo_2):<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_4837"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'> eseguo_quello_che_voglio_2() <o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_4837"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'> orario_partenza_evento_2 = time.time() <o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_4837"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>Tutti i vari controlli <o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>Chiaramente più la complessità del programma cresce, più tempo ci vorrà tra una scansione e l'altra, se tu vuoi effettuare esattamente N controlli al secondo puoi introdurre uno sleep alla fine di ogni ciclo e rallentare l'esecuzione del programma.<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>Per completezza c'è da dire che esistono anche gli interrupt, ma in questo caso non ne vedo la necessità.<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'><o:p> </o:p></span></p></div><div id="yui_3_16_0_ym19_1_1483107967020_3899"><div style='mso-element:para-border-div;border:none;border-bottom:solid windowtext 1.5pt;padding:0cm 0cm 1.0pt 0cm;background:white'><p class=MsoNormal style='background:white;border:none;padding:0cm'><span style='font-family:"Helvetica","sans-serif";color:#4F81BD'>Piergiorgio Pancino<o:p></o:p></span></p></div><p class=MsoNormal style='background:white'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif"'>Grazie per la spiegazione tecnica,<o:p></o:p></span></p><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif"'>nel frattempo ho provato ad usare il confronto con la temporizzazione.<o:p></o:p></span></p><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif"'>Vorrei provare a creare una classe specifica e poi istanziare gli oggetti temporizzatori ogni volta che né ho necessita.<o:p></o:p></span></p><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif"'>Viceversa era interessante l’utilizzo dei trend e gli eventi generati dalla variazione dello stato degli ingressi.<o:p></o:p></span></p><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif"'>Al fine di eseguire ad esempio un contatore veloce che conti degli impulsi in ingresso.<o:p></o:p></span></p><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif"'>Grazie per la collaborazione<o:p></o:p></span></p><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal style='background:white'><span style='font-family:"Helvetica","sans-serif"'>Attilio Menegon<o:p></o:p></span></p></div></div></div></body></html>