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PLCopen庫的應(yīng)用舉例
例1:印刷機(jī)的控制開發(fā)
對于印刷機(jī)械而言,其核心在于印刷套色,基于PLCopen的庫,我們可以通過圖中的功能塊RegMarkCapture001來進(jìn)行色標(biāo)的抓取,通過RegMarkCacl001進(jìn)行色標(biāo)偏差的計算和解耦算法,并通過Offset進(jìn)行相位偏移的控制輸出,這三個功能塊可以實現(xiàn)對印刷的套色計算和控制,結(jié)合速度控制模塊、扭矩控制實現(xiàn)對張力控制的計算。
除了應(yīng)用于凹版印刷機(jī)的套色控制,PLCopen在柔版、商業(yè)輪轉(zhuǎn)機(jī)等高性能卷筒紙印刷領(lǐng)域也得到了廣泛應(yīng)用,大大降低了開發(fā)周期。
例2:PLCopen庫在旋蓋控制中的應(yīng)用
在啤酒飲料灌裝系統(tǒng)中,如何實現(xiàn)更高效且高品質(zhì)的旋蓋控制,即可借助于PLCopen的庫:
對于旋蓋而言,角度控制MC_MoveAdditive可以提高速度,它可以確保旋蓋過程以極大的速度進(jìn)行,但是,卻不能保障每個旋蓋動作的扭矩控制質(zhì)量,通過TorqueControl模塊,可以確保每個瓶蓋的相同力矩,確保旋蓋質(zhì)量的一致性,但是,TorqueControl卻會降低效率,因為不能過高的速度,否則會將瓶子損壞。
因此,通過MC_MoveAdditive和MC_BR_TorqueControl的混合使用可以確保高品質(zhì)同時高速的旋蓋控制。
例3:PLCopen Safety安全庫的應(yīng)用
仍然以啤酒飲料灌裝設(shè)備來看,對于高速運轉(zhuǎn)的機(jī)器,必須考慮人身的安全以及設(shè)備的運行安全,尤其是對連續(xù)生產(chǎn)的智能產(chǎn)線而言,其由吹瓶、清洗、灌裝、旋蓋、貼標(biāo)、膜包等一系列流程構(gòu)成,如果某個單元出現(xiàn)安全動作,則整個生產(chǎn)線將因此停滯,帶來巨大的潛在浪費,而SLS和STO可以解決這一問題,通過PLCopen Safety庫設(shè)計,我們可以實現(xiàn)兩個安全功能來確保生產(chǎn)效率與安全的平衡。
1. SLS降低產(chǎn)線速度,低速運行的機(jī)器將會帶給人身風(fēng)險的極大下降,通常在人員進(jìn)入機(jī)器的安全區(qū)則速度下降,如從10m/S的線速度下降到0.5m/S,則會大幅度降低傳動設(shè)備對人身的潛在傷害,而同時產(chǎn)線并不會因此停止帶來再開機(jī)的成本以及在制品的浪費。
2. STO,通過伺服驅(qū)動的待機(jī)狀態(tài),在人員進(jìn)入工作區(qū),僅切斷力矩輸出,而不切斷電源,確保機(jī)器處于安全狀態(tài),在人員離開后,重新啟動工作,從當(dāng)前位置繼續(xù)。
此兩者均是基于生產(chǎn)效率與安全的平衡設(shè)計,可以通過PLCopen的Safety庫軟件設(shè)計來實現(xiàn)
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