1763-L16BBB
1763-L16BBB
1763-L16BBB
PLC有很强的自诊断功能,PLC每扫描一次执行一次自诊断检查,确定PLC自身的动作是否正常,如电源检测、内部硬件是否正常、程序语法是否有错等。如检查出异常时,CPU面板的LED及异常继电器会接通,在特殊寄存器中会存入出错代码;CPU能根据错误类型和程度发出信号,甚至进行相应的出错处理,使PLC停止扫描或强制变成STOP状态。
PLC运行正常时,扫描周期的长短与用户应用程序的长短、CPU的运算速度、I/O点的情况等有关。通常用PLC执行1KB指令所需时间来说明其扫描速度(一般1-10ms/KB)。值得注意的是,不同指令执行时间是不同的,故选用不同指令所用的扫描时间将会不同。若用于高速系统要缩短扫描周期时,可从软硬件上同时考虑。PLC周期性循环扫描工作方式的显著特点是:可靠性高、抗干扰能力强,但响应滞后、速度慢。
备货,备货,降降降,火火火,火火火……
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