在系統(tǒng)狀態(tài)參考表中可以看到–些離散型的參數(shù)(%S,%B和%SC),如果梯形圖中用到這些參數(shù)，也可以在梯形圖中看到，可以據(jù)此確定各種條件和故障的狀態(tài)。舉例來說，如果上面兩個(gè)表中的任–個(gè)表有故障記錄，%SC0009將置位。再比如，如果CPU內(nèi)存?zhèn)溆秒姵仉娏康?，則%SA0011置位。系列90-30PLC CPU指令參考手冊，GFK-0467.包含–個(gè)系統(tǒng)狀態(tài)參考表”.

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