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EPRO傳感器PR9376/010-011
EPRO傳感器PR9376/010-011
Brand/Manufacturer | Epro |
Part Number | PR9376/010-011 |
Alternate Part Number | |
Description | |
Dimensions | 20x20x5cm |
Weight | 0.58 kg |
2 I/O點(diǎn)數(shù)的確定。 統(tǒng)計(jì)被控制系統(tǒng)的開(kāi)關(guān)量、模擬量的I/O點(diǎn)數(shù),并考慮以后的擴(kuò)充(一般加上10%~20%的備用量),從而選擇PLC的I/O點(diǎn)數(shù)和輸出規(guī)格。
3 內(nèi)存的估算。 用戶程序所需的內(nèi)存容量主要與系統(tǒng)的I/O點(diǎn)數(shù)、控制要求、程序結(jié)構(gòu)長(zhǎng)短等因素有關(guān)。一般可按下式估算:存儲(chǔ)容量=開(kāi)關(guān)量輸入點(diǎn)數(shù)×10+開(kāi)關(guān)量輸出點(diǎn)數(shù)×8+模擬通道數(shù)×100+定時(shí)器/計(jì)數(shù)器數(shù)量×2+通信接口個(gè)數(shù)×300+備用量。
(3)分配I/O點(diǎn)。 分配PLC的輸入/輸出點(diǎn),編寫(xiě)輸入/輸出分配表或畫(huà)出輸入/輸出端子的接線圖,接著就可以進(jìn)行PLC程序設(shè)計(jì),同時(shí)進(jìn)行控制柜或操作臺(tái)的設(shè)計(jì)和現(xiàn)場(chǎng)施工。
(4)程序設(shè)計(jì)。 對(duì)于較復(fù)雜的控制系統(tǒng),根據(jù)生產(chǎn)工藝要求,畫(huà)出控制流程圖或功能流程圖,然后設(shè)計(jì)出梯形圖,再根據(jù)梯形圖編寫(xiě)語(yǔ)句表程序清單,對(duì)程序進(jìn)行模擬調(diào)試和修改,直到滿足控制要求為止。
(5)控制柜或操作臺(tái)的設(shè)計(jì)和現(xiàn)場(chǎng)施工。 設(shè)計(jì)控制柜及操作臺(tái)的電器布置圖及安裝接線圖;設(shè)計(jì)控制系統(tǒng)各部分的電氣互鎖圖;根據(jù)圖紙進(jìn)行現(xiàn)場(chǎng)接線,并檢查。
(6)應(yīng)用系統(tǒng)整體調(diào)試。如果控制系統(tǒng)由幾個(gè)部分組成,則應(yīng)先作局部調(diào)試,然后再進(jìn)行整體調(diào)試;如果控制程序的步序較多,則可*行分段調(diào)試,然后連接起來(lái)總調(diào)。
PLC接通電源并開(kāi)始運(yùn)行后,立即開(kāi)始進(jìn)行自診斷,自診斷時(shí)間的長(zhǎng)短隨用戶程序的長(zhǎng)短而變化。自診斷通過(guò)后,CPU就對(duì)用戶程序進(jìn)行掃描。掃描從0000H地址所存的*條用戶程序開(kāi)始,順序進(jìn)行,直到用戶程序占有的后一個(gè)地址為止,形成一個(gè)掃描循環(huán),周而復(fù)始。順序掃描的工作方式簡(jiǎn)單直觀,它簡(jiǎn)化了程序的設(shè)計(jì),并為PLC的可靠運(yùn)行提供了保證。一方面所掃描到的指令被執(zhí)行后,其結(jié)果馬上就可以被將要掃描到的指令所利用。另一方面還可以通過(guò)CPU設(shè)置掃描時(shí)間監(jiān)視定時(shí)器來(lái)監(jiān)視每次掃描是否超過(guò)規(guī)定的時(shí)間,從而避免由于CPU內(nèi)部故障使程序執(zhí)行進(jìn)入死循環(huán)而造成的故障。
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