CI854AK01-eA ABB

The CPU is the core of the PLC and acts as the nerve center.Each PLC has at least one CPU.It receives and stores user programs and data according to the functions assigned by the PLC system program.The state or data is stored in the specified register,and at the same time,the working state of the power supply and the PLC internal circuit and the syntax error in the programming process are diagnosed.After entering the operation,read the instructions one by one from the user program memory,and then generate the corresponding control signal according to the task specified by the instruction after analysis to command the relevant control circuit.

CPU是PLC的核心，起神经中枢的作用，每套PLC至少有一个CPU，它按PLC的系统程序赋予的功能接收并存贮用户程序和数据，用扫描的方式采集由现场输入装置送来的状态或数据，并存入规定的寄存器中，同时，诊断电源和PLC内部电路的工作状态和编程过程中的语法错误等。进入运行后，从用户程序存贮器中逐条读取指令，经分析后再按指令规定的任务产生相应的控制信号，去指挥有关的控制电路。