22A-A4P5H204

在開(kāi)發(fā)可編程控制器應(yīng)用程序之前需要考慮幾個(gè)因素。關(guān)鍵的是系統(tǒng)應(yīng)該如何架構(gòu)，以適合當(dāng)前的需要，并允許不久后輕松擴(kuò)展的選項(xiàng)。

還應(yīng)考慮受控的工藝過(guò)程或設(shè)備,是否為它們選擇了正確的硬件和軟件包？如果被控制的系統(tǒng)是一條包裝線(xiàn)，是遵循OMAC PackML 模型還是使用客戶(hù)提供的模型？

在進(jìn)行任何開(kāi)發(fā)之前，還需要考慮適用的標(biāo)準(zhǔn)。應(yīng)用程序是否遵循任何ISA標(biāo)準(zhǔn),例如用于批處理控制的 ISA-88 模型？我們是否會(huì)使用客戶(hù)提供或供應(yīng)商提供的任何全局對(duì)象嗎？諸如此類(lèi)的問(wèn)題有助于提供對(duì)所需控制器內(nèi)存大小的洞察。

另一個(gè)需要考慮的重要因素是整體系統(tǒng)架構(gòu)設(shè)計(jì)。了解現(xiàn)有或潛在的新網(wǎng)絡(luò)架構(gòu)將是什么樣子。例如，系統(tǒng)是否需要幾個(gè)通信模塊來(lái)運(yùn)行，同時(shí)提供穩(wěn)健和的網(wǎng)絡(luò)設(shè)計(jì)？

此外，還應(yīng)考慮與制造執(zhí)行系統(tǒng)（MES）和數(shù)據(jù)采集系統(tǒng)的任何潛在接口。這些系統(tǒng)是否需要任何標(biāo)簽結(jié)構(gòu)和命名，需要我們將其納入應(yīng)用程序中？這都是需要在開(kāi)始編程前考慮的一些注意事項(xiàng)。

在設(shè)計(jì)控制系統(tǒng)時(shí)，應(yīng)確保編程符合應(yīng)用程序的當(dāng)前需求，并考慮到未來(lái)的可擴(kuò)展性。

關(guān)鍵概念：

■在項(xiàng)目定義階段開(kāi)始對(duì) PLC 進(jìn)行編程，同時(shí)編制設(shè)計(jì)文件。

■PLC編程的方式應(yīng)便于終用戶(hù)的理解，還應(yīng)考慮標(biāo)準(zhǔn)和具體應(yīng)用的需求。

22A-A4P5H204   

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