施耐德系統(tǒng)TSXP572823M

施耐德系統(tǒng)TSXP572823M從考慮，重大部分不接入 PLC 的輸入端，而做硬件處理。例如，緊急停車按鈕、互鎖觸點(diǎn)、緊急限位開(kāi)關(guān)、熱繼電器控制觸點(diǎn)等，接至 PLC 的輸出端子上，直接對(duì)輸出負(fù)載(KM1、KM2)進(jìn)行控制，以保證 PLC 故障時(shí)不損壞設(shè)備，不造成重大事故。

應(yīng)保證有效輸入信號(hào)的電平保持時(shí)間。要保證輸入信號(hào)有效，輸入信號(hào)的電平保持時(shí)間大于 PLC 一個(gè)掃描周期。除非對(duì)開(kāi)關(guān)量輸入信號(hào)設(shè)置允許脈沖捕捉功能，這樣就允許 PLC 捕捉到持續(xù)時(shí)間很短的脈沖。

PLC 指令的執(zhí)行條件有信號(hào)電平有效和跳變有效的區(qū)別，編程時(shí)應(yīng)加以注意。

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