描述
第一步:閱讀產(chǎn)品說明書
第一步看起來再簡單不過了,但很多工程師都做不到。認為這一步是浪費時間,甚至只從供貨方培訓(xùn)來了解設(shè)備。
仔細閱讀說明書是編程的第一步,首先要閱讀安全守則,知道哪些執(zhí)行機構(gòu)可能會對人身造成傷害,哪些機構(gòu)間最容易發(fā)生撞擊,當發(fā)生危險時如何解決,這些最致命的問題都在安全守則中,為什么不去看呢?
此外,關(guān)于設(shè)備每個元件的特性,使用方法,調(diào)試方法也在說明書中,不去閱讀,即使程序正確,如果元件沒有調(diào)試好,設(shè)備一樣不能工作。再有,所有的電路圖、氣動液壓回路圖、裝配圖也在說明書中,不去閱讀它怎么知道沒種元件可以做何種改造呢。
第二步:根據(jù)說明書,檢查I/O
檢查I/O,俗稱“打點”。檢查I/O的方法很多,但是一定要根據(jù)說明書提供的地址依次進行檢查,在絕對安全的情況下來檢查。
在檢查輸入點時,一般輸入信號無非是各種傳感器,如電容、電感、光電、壓阻、超聲波、磁感式和行程開關(guān)等傳感器。檢查這些元件比較簡單,根據(jù)元件說明將工件放在工位上,或是移動執(zhí)行機構(gòu)檢查傳感器是否有信號即可。當然,不同的設(shè)備檢測的方式可能不同,這要看具體情況而定了。
但是在檢查輸出信號時就要格外小心了。如果是電驅(qū)動產(chǎn)品,必須在安全情況下,尤其是保證設(shè)備不會發(fā)生撞擊前提下,讓執(zhí)行機構(gòu)的驅(qū)動器得電,檢查執(zhí)行機構(gòu)是否能夠運動。如果是液壓或氣動執(zhí)行機構(gòu),同樣在安全情況下手動使換向閥得電,從而控制執(zhí)行機構(gòu)。在檢查輸出信號時,不論執(zhí)行機構(gòu)的驅(qū)動方式是什么,一定要根據(jù)元件說明書,首先要保證設(shè)備和人身安全,要注意并不是所有設(shè)備的執(zhí)行機構(gòu)都可以通電測試的,所以有時個別的輸出信號可能無法手動測試。
無論是輸入還是輸出裝置,當傳感器有信號或執(zhí)行機構(gòu)的驅(qū)動裝置得電后,必須同時檢查PLC上的I/O模塊指示燈是否也點亮。很多設(shè)備中,輸入輸出信號是通過接線端子與PLC連接,有時接線端子的指示燈有信號,但不能保證由于連接導(dǎo)線內(nèi)部斷路,而PLC上相應(yīng)的地址沒有信號接通。這一點要特別注意。
在測量輸入輸出信號后,要同時將測量的地址記錄下來,保證信號地址和說明書中一致。如有不同,再次測量設(shè)備地址,多次測量仍然不一致,先聯(lián)系設(shè)備廠家,因為此時不能保證廠家提供的地址沒有錯誤。
產(chǎn)品承諾:
保?證?全新原裝進口,
保?證?安全準時發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢價格,大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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