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1.3 接地和接線
1) PLC的良好接地是正常運(yùn)行的前提。在設(shè)計(jì)時(shí)，PLC的接地應(yīng)與動(dòng)力設(shè)備的接地分開，采用專用接地；如不能分開接地時(shí)，應(yīng)采用共用接地；禁止采用共通接地方法。如圖1所示，接地點(diǎn)應(yīng)盡可能靠近PLC，接地線的線徑應(yīng)大于4mm2，接地電阻一般應(yīng)小于10Ω。
2) PLC的接線包括輸入接線和輸出接線。輸入接線的長(zhǎng)度不宜過(guò)長(zhǎng)，一般不大于30m；在線路距離較長(zhǎng)時(shí)，可采用中間繼電器進(jìn)行信號(hào)的轉(zhuǎn)換。輸入接線的COM端與輸出接線的COM端不能接在一起。輸入接線與輸出接線的電纜應(yīng)分開設(shè)置。必要時(shí)，可在現(xiàn)場(chǎng)分別設(shè)置接線箱。集成電路或晶體管設(shè)備的輸入信號(hào)和輸出信號(hào)的接線必須采用屏蔽電纜；屏蔽層的接地端應(yīng)為一點(diǎn)接地，接地點(diǎn)宜在控制器側(cè)。
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