西門子PLC基本指令功能介紹
一、標準觸點 LD、A、O、LDN、AN、ON、
LD,取指令。表示一個與輸入母線相連的常開接點指令,即常開接點邏輯運算起始。
LDN,取反指令。表示一個與輸入母線相連的常閉接點指令,即常閉接點邏輯運算起始。
A,與指令。用于單個常開接點的串聯。
AN,與非指令。用于單個常閉接點的串聯。
O,或指令。用于單個常開接點的并聯。
ON,或非指令。用于單個常閉接點的并聯。
二、正、負跳變 ED、EU
ED,在檢測到一個正跳變(從OFF到ON)之后,讓能流接通一個掃描周期。
EU,在檢測到一個負跳變(從ON到OFF)之后,讓能流接通一個掃描周期。
三、輸出 =
=,在執行輸出指令時,映像寄存器中的指定參數位被接通。
四、置位與復位指令S、R
S,執行置位(置1)指令時,從bit或OUT指定的地址參數開始的N個點都被置位。
R,執行復位(置0)指令時,從bit或OUT指定的地址參數開始的N個點都被復位。
置位與復位的點數可以是1-255,當用復位指令時,如果bit或OUT指定的是T或C時,那么定時器或計數器被復位,同時當前值將被清零。
五、空操作指令NOP
NOP指令不影響程序的執行,執行數N(1-255)。
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