如果指令模块规定程序要等待-一个回答,则指令模块的内容便送到接受设备,而CPU等待一个回答。PLC将等待设备作出响应的最长时向规定在指令块中。在此时间内,如果设备未作出响应,程序将再继续执行。这就是所谓的等待(WAT)方式。
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