如果指令模塊規(guī)定程序要等待-一個回答,則指令模塊的內(nèi)容便送到接受設(shè)備,而CPU等待一個回答。PLC將等待設(shè)備作出響應的最長時向規(guī)定在指令塊中。在此時間內(nèi),如果設(shè)備未作出響應,程序?qū)⒃倮^續(xù)執(zhí)行。這就是所謂的等待(WAT)方式。

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