ELAU MC-4/11/03/400
當(dāng)對數(shù)/指數(shù)功能得電時(shí),將對輸入IN進(jìn)行相應(yīng)的對數(shù)/指數(shù)運(yùn)算,并且結(jié)果放在輸出Q中。
■以10為底(LOG)對數(shù)功能, 10為底IN的對數(shù)放在Q中。
■自然對數(shù)(LN)功能,IN的自然對數(shù)放在Q中。
■對于E的冪(EXP)功能,e的IN次冪并且結(jié)果放在Q中。
■對于X的冪(EXPT)功能,輸入I1的I2次冪,結(jié)果放在Q中(EXPT功能有3個(gè)輸入?yún)?shù)和2個(gè)輸出參數(shù)) OK輸出產(chǎn)生電流除非輸入是NAN (非數(shù)值)或負(fù)數(shù)。
延續(xù)線圈和觸點(diǎn)
延續(xù)線圈和延續(xù)觸點(diǎn)被用做繼電器梯形圖的回路邏輯延續(xù)。最后被執(zhí)行的延續(xù)線圈邏輯通流的狀態(tài),它將用于下個(gè)被執(zhí)行的延續(xù)觸點(diǎn)。如果邏輯在執(zhí)行一個(gè)延續(xù)觸點(diǎn)之前延續(xù)線圈未得電,則觸點(diǎn)的狀態(tài)不是通流狀態(tài),每個(gè)環(huán)路只能用一個(gè)延續(xù)線圈和延續(xù)觸點(diǎn),并且延續(xù)觸點(diǎn)在行的第一位,延續(xù)線圈必須在后面。
置位線圈
SET和RESET均為非保持型線圈,被用于保持某個(gè)變量的狀態(tài)(ON或OFF)。當(dāng)置位線圈通過電流時(shí),它被置位為ON直到它被復(fù)位。
復(fù)位線圈
如果復(fù)位線圈流過電流,對應(yīng)離散變量為OFF,直到它被置位為止。一對置位復(fù)位線圈其狀態(tài)取決于最后執(zhí)行的那個(gè)指令。
保持置位線圈
保持置位線圈和保持復(fù)位線圈類似于置位線圈和復(fù)位線圈,但是它們在失電后或者PLC從STOP轉(zhuǎn)為RUN時(shí)其狀態(tài)仍保持。保持式置位線圈通過電流,其對應(yīng)離散變量為ON,直到被復(fù)位線圈復(fù)位為止。
保持復(fù)位線圈
當(dāng)保持復(fù)位線圈流過電流,對應(yīng)離散變量為OFF,直到被置位線圈置位為止。PLC失電或者PLC從STOP轉(zhuǎn)為RUN時(shí)其狀態(tài)仍保持。
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