除了模塊，PLC還有外部設(shè)備。
盡管用PLC完結(jié)對(duì)體系的操控可不必外部設(shè)備，裝備好適宜的模塊就行了。但是，要對(duì)PLC編程，要監(jiān)控PLC及其所操控的體系的作業(yè)狀況，以及存儲(chǔ)用戶程序、打印數(shù)據(jù)等，就得運(yùn)用PLC的外部設(shè)備。故一種PLC的功用怎么，與這種PLC所具外部設(shè)備豐厚與否，外部設(shè)備好用與否直接有關(guān)。
PLC的外部設(shè)備有四大類：
編程設(shè)備：簡(jiǎn)略的為簡(jiǎn)便編程器，多只承受助記將編程，單個(gè)的也可用圖形編程（如日本東芝公司的EX型可編程操控器）。雜亂一點(diǎn)的有圖形編程器，可用梯形圖語(yǔ)編程。有的還有專用的核算機(jī)，可用其它高檔語(yǔ)編程。編程器除了用于編程，還可對(duì)體系作一些設(shè)定，以斷定PLC操控辦法，或作業(yè)辦法。編程器還可監(jiān)控PLC及PLC所操控的體系的作業(yè)狀況，以進(jìn)行PLC用戶程序的調(diào)試。
監(jiān)控設(shè)備：小的稀有據(jù)監(jiān)督器，可監(jiān)督數(shù)據(jù)；大的還也許有圖形監(jiān)督器，可經(jīng)過(guò)畫面監(jiān)督數(shù)據(jù)。除了不能改動(dòng)PLC的用戶程序，編程器能做的它都能做，是運(yùn)用PLC極好的界面。功用好的PLC，這種外部設(shè)備已越來(lái)越豐厚。

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