12P0678X022
12P0678X022处理单元(CPU)是PLC的控制中枢。它按照PLC系统程序赋予的功能接收并存储从编程器输入的用户程序和数据，检查电源、存储器、VO以及警戒定时器的状态并能诊断用户程序中的语法错误:当PLC投入运行时，首先它以扫描的方式接收现场各输入装置的状态和数据，并分别存入IO映像区，然后从用户程序存储器中逐条读取用户程序，经过命令解释后，按指令的规定将逻辑或算术运算的结果送入Vo映像区或数据寄存器内。等所有的用户程序执行完毕之后，*将1/O映像区的各输出状态或输出寄存器
的数据传送到相应的输出装置，如此循环运行，直到停止运行为止。
为了进一步提高PLC的可靠性，近年来对大型PLC还采用双CPU构成冗余系统，或
采用三CPU的表决式系统。这样，即使某个CPU出现故障，整个系统仍能正常运行。
Based on years of experience in the design, manufacturing and operation of ring network cabinets, abb has developed many targeted intelligent monitoring and diagnosis algorithms to realize the transformation of equipment from periodic operation and maintenance to state operation and maintenance and predictive operation and maintenance, so as to reduce the dispatch of on-site operation and maintenance orders and save manpower. ABB's algorithm development
d on real equipment data has greatly improved the accuracy of monitoring and diagnosis. It also took the lead in putting forward the concept of self-learning dynamic threshold, directly facing the individual differences of equipment, realizing real-time adjustment and automatic adjustment of threshold, accurately identifying and judging the operating status of equipment, and making equipment operation and maintenance more worry free. Summer is a holiday and rest season. How can you stand in front of the equipment in the scorching sun? ABB's diversified user interaction means make you no longer have to wait on the site to the end. Remote information interaction can also be carried out conveniently, and you can easily enjoy the midsummer without being bound by work.
