1756-L62
1756-L62
1756-L62
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。
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厦门泰尼电气有限公司
【产品质量】原装进口
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【产品质保】 1 年
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ABB Board Card 5731 0256-DB 57310256-DB DSBC-170
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Gould Modicon I/O Expander J471-600 J471600 J471 600
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Modicon PC-E984-385 984 cpu 16k mem 1xmb mb+
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SMART PANEL PLUS TCP GP320-LG11-L0 TOUCH SCREEN
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