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<h1>Flusso di Scambio Dati (PLC-HMI-SCADA)</h1>
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<h1 id="flusso-di-scambio-dati-plc-hmi-scada">Flusso di Scambio Dati (PLC-HMI-SCADA)</h1>
<h2 id="panoramica">Panoramica</h2>
<p>Questo documento descrive la logica e la sequenza dinamica di “handshake” utilizzate per la comunicazione tra il PLC, linterfaccia operatore (HMI) e il sistema di supervisione (SCADA). Lobiettivo è garantire uno scambio dati robusto e a prova di errore per le operazioni critiche come il cambio produzione e il monitoraggio della connessione.</p>
<h2 id="processo-principale-cambio-ricettaproduzione">Processo Principale: Cambio Ricetta/Produzione</h2>
<p>Il processo di cambio ricetta è linterazione più complessa e viene gestito da una macchina a stati (<code>S60_RecipeManagement</code>) nel PLC per garantire che ogni passo venga eseguito nella sequenza corretta.</p>
<h3 id="sequenza-di-scambio-dati">Sequenza di Scambio Dati</h3>
<p>Il “dialogo” tra i tre sistemi segue questi passaggi:</p>
<ol><li><p><strong>Abilitazione (HMI):</strong> Loperatore abilita il controllo remoto sullHMI.</p>
<ul>
<li><code>HMI -&gt; PLC</code>: Imposta <code>MachineAnalytics.HMI_Interface.RemoteControlEn = TRUE</code>.</li>
</ul>
</li>
<li><p><strong>Richiesta (SCADA):</strong> Lo SCADA invia i dati per la nuova produzione (Indice Ricetta, Codice Lotto, etc.) e imposta il bit di richiesta.</p>
<ul>
<li><code>SCADA -&gt; PLC</code>: Imposta <code>ScadaInterface.Ingress.ProductionChangeRequest = TRUE</code>.</li>
</ul>
</li>
<li><p><strong>Ack a SCADA (PLC):</strong> Il PLC valida la richiesta. Se è corretta, risponde immediatamente:</p>
<ul>
<li><code>PLC -&gt; SCADA</code>: Invia la conferma di ricezione (<code>Egress.AckChangeRecipe = TRUE</code>).</li>
</ul>
</li>
<li><p><strong>Completamento Handshake (SCADA):</strong> Lo SCADA, non appena riceve lAck, sa che il PLC ha preso in carico la richiesta e <strong>abbassa subito</strong> il suo bit di richiesta.</p>
<ul>
<li><code>SCADA -&gt; PLC</code>: Imposta <code>Ingress.ProductionChangeRequest = FALSE</code>.</li>
</ul>
</li>
<li><p><strong>Completamento Handshake (PLC):</strong> Il PLC, vedendo che la richiesta è stata abbassata, abbassa a sua volta il suo <code>AckChangeRecipe</code>. Lhandshake iniziale è concluso e il PLC procede autonomamente.</p>
</li>
<li><p><strong>Attivazione Pop-up (PLC):</strong> Il PLC attiva il flag per lapertura del pop-up sullHMI.</p>
<ul>
<li><code>PLC -&gt; HMI</code>: Imposta <code>HMI_Interface.AckChangeRecipeToHMI = TRUE</code>.</li>
</ul>
</li>
<li><p><strong>Visualizzazione (HMI):</strong> LHMI mostra il pop-up di conferma alloperatore con i dati della ricetta richiesta.</p>
</li>
<li><p><strong>Risposta (Operatore):</strong> Loperatore sceglie una delle opzioni sul pop-up:</p>
<ul>
<li><strong>ACCETTA:</strong> LHMI imposta <code>HMI_Interface.RecipeChangeOk = TRUE</code>. Il PLC esegue lazione (carica la ricetta, aggiorna i dati) e invia lesito positivo allo SCADA (<code>Egress.RecipeChangeOK = TRUE</code> per 2 secondi).</li>
<li><strong>RIFIUTA (o preme X):</strong> LHMI imposta <code>HMI_Interface.RejectRecipeChange = TRUE</code> (o <code>CloseMESWindow</code>). Il PLC invia lesito negativo allo SCADA (<code>Egress.RecipeChangeReject = TRUE</code> per 2 secondi).</li>
<li><strong>POSTICIPA:</strong> LHMI imposta <code>HMI_Interface.BatchChangePopupDismiss = TRUE</code>. Il PLC invia lo stato di attesa allo SCADA (<code>Egress.RecipeChangePostpone = TRUE</code>), avvia un timer (30 secondi) e, alla scadenza, torna al <strong>Passo 6</strong> per far riapparire il pop-up.</li>
</ul>
</li>
</ol>
<hr>
<h2 id="handshake-di-base-watchdog-heartbeat">Handshake di Base: Watchdog (Heartbeat)</h2>
<p>Per garantire che la comunicazione sia sempre attiva, è implementato un meccanismo di “heartbeat” a bit alternato.</p>
<ul>
<li><strong>Dal PLC allo SCADA:</strong> Il PLC inverte il valore del bit <code>ScadaInterface.Egress.PlcHeartbeat_Toggle</code> ogni secondo.</li>
<li><strong>Dallo SCADA al PLC:</strong> Lo SCADA deve leggere <code>PlcHeartbeat_Toggle</code> e ricopiarne il valore nel bit <code>ScadaInterface.Ingress.ScadaHeartbeat_Echo</code>.</li>
<li><strong>Controllo del PLC:</strong> Se <code>PlcHeartbeat_Toggle</code> e <code>ScadaHeartbeat_Echo</code> rimangono diversi per più di un tempo di timeout (es. 3 secondi), il PLC imposta a <code>VERO</code> il flag <code>ScadaInterface.Egress.MesCommunicationFault</code>.</li>
</ul>
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<h2 class="toc-title">On This Page</h2>
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<li class="toc-item toc-level-2">
<a href="#panoramica" class="toc-link">Panoramica</a>
</li>
<li class="toc-item toc-level-2">
<a href="#processo-principale-cambio-ricettaproduzione" class="toc-link">Processo Principale: Cambio Ricetta/Produzione</a>
</li>
<li class="toc-item toc-level-3">
<a href="#sequenza-di-scambio-dati" class="toc-link">Sequenza di Scambio Dati</a>
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<a href="#handshake-di-base-watchdog-heartbeat" class="toc-link">Handshake di Base: Watchdog (Heartbeat)</a>
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