msp302N
msp302N圖5-2為PLC接線圖,圖5-3為控制梯形圖。圖5-4描述了每個掃描周期程序的執(zhí)行過程。按鈕SB2雖然在程序中沒有使用,但其狀態(tài)仍影響其對應(yīng)編號的內(nèi)部輸入繼電器的狀態(tài)。
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圖(a)中,①輸入掃描過程,將兩個按鈕的狀態(tài)掃描后,存入其映像區(qū),由于SB2是停止按鈕,所以,即使沒有按下,其輸入回路也是閉合的,因此,X1存“1”(ON狀態(tài)),而其它位存“0”(OFF狀態(tài))。②執(zhí)行程序過程,程序根據(jù)所用到觸點的編號對應(yīng)的內(nèi)部繼電器狀態(tài)來運算。由于X0處于OFF狀態(tài),因此,對應(yīng)的動合觸點處于斷開狀態(tài),運算結(jié)果是Y0、Y1處于OFF狀態(tài),其結(jié)果存入輸出映像區(qū),即Y0、Y1存“0”。③輸出刷新過程,根據(jù)映像區(qū)各位的狀態(tài)驅(qū)動輸出設(shè)備,由于輸出映像區(qū)均為OFF狀態(tài),所以,輸出指示燈不能形成閉合回路,燈不亮。如果輸入不發(fā)生變化,內(nèi)部繼電器的狀態(tài)均不發(fā)生變化。圖(b)中,按下SB1按鈕后,X0輸入回路閉合。①輸入掃描將輸入狀態(tài)存入其映像區(qū),X0、X1均存“1”。②執(zhí)行程序過程,按照從左到右,從上到下的原則,逐條執(zhí)行。第一行,X0觸點閉合,但此時,Y1的狀態(tài)為“0”,因此,Y1觸點為斷開狀態(tài),Y0沒能導(dǎo)通,其狀態(tài)為“0”。第二行,X0觸點閉合,所以,Y1的狀態(tài)為“1”。③輸出刷新過程,由于Y1呈導(dǎo)通狀態(tài),燈2亮。
圖(c)為按下SB1按鈕后的第二個掃描周期。①輸入掃描,由于輸入狀態(tài)不變,輸入映像區(qū)不變。②執(zhí)行程序過程,第一行,X0觸點閉合,由于上一個周期中,Y1為ON狀態(tài),因此,Y1觸點也閉合,Y0也呈導(dǎo)通狀態(tài);第二行,Y1還呈導(dǎo)通狀態(tài)。Y0、Y1的狀態(tài)均為“1”。③輸出刷新過程,兩個燈都亮。注意:由于PLC的掃描周期很短,我們用肉眼見到的現(xiàn)象可能是兩燈同時亮。如果按鈕沒有變化,內(nèi)部繼電器、輸出設(shè)備狀態(tài)均無變化。
圖( d)為松開SB1按鈕后的第一個掃描周期。①輸入掃描使輸入映像區(qū)的X0存“0”、 X1存“1”。②執(zhí)行程序過程,X0觸點斷開, Y1由于上個周期被置“1”,因此,Y1觸點為閉合狀態(tài)。③輸出刷新過程,由于X0觸點的斷開,Y0 、Y1都呈斷開狀態(tài)。
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