ABB PP877K 3BSE069274R1
品牌 : ABB
型号 : PP877K 3BSE069274R1
认证 : CQ
起源地;原产地 : 德国
最小起订量: 1
交货时间 : 付款后3日发货
Con 6DS1311-8AE 控制系统: PP877K 3BSE069274R1
应用 : 核电站
交货时间 : 有现货
PLC的中央处理器(CPU 一般由控制器、运算器和寄存器组成,这些电路都集成在一个芯片内。CPU通过数据总线、地址总线和控制总线与存储单元、输入/输出接口电路相连接。 PLC采用的CPU随机型不同而不同, 目前,小型PLC为单CPU系统,中型及大型则采用双CPU甚至多CPU系统。目前,PLC通常采用的微处理器有三种:通用微处理器、单片微处理器(即单片机)、位片式微处理器。
与一般的计算机一样,CPU是整个PLC的控制,它按PLC中系统程序赋予的功能指挥PLC有条不紊的进行工作。CPU主要完成下述工作:
(1)接收、存储用户通过编程器等输入设备输入的程序和数据。
(2)用扫描的方式通过I/O部件接收现场信号的状态或数据,并存入输入映像寄存器或数据存储器中。
(3)诊断PLC内部电路的工作故障和编程中的语法错误等。
(4) PLC进入运行状态后,执行用户程序,完成各种数据的处理、传输和存储相应的内部控制信号,以完成用户指令规定的各种操作。
(5)响应各种外围设备(如编程器、打印机等)的请求。
The logic programming is first done in the PLC configuration software. Next the OPC server has to be configured.For a native OPC server this happens automatically, but for a third-party OPC server manual data mapping is required which is time consuming and error prone requiring thorough testing.Therefore native OPC server is preferred. Lastly the HMI database has to be configured for graphics, alarms, and trend etc.
If the HMI software comes from the same manufacturer as the PLC, the intermediate data mapping step may not be required, making the integration easier.However, even if the PLC and HMI manufacturer are the same, the data mapping may still be required in case the two products were designed separately.
The sensor & actuator level “H1” fieldbus network supported by PLC is primarily ASI, CompoNet, IO-bbbb, and PROFIBUS-PA for instrumentation and PROFIBUS-DP or DeviceNet for motor controls.Each PLC manufacturer typically has a native protocol, yet open standard, which the PLC architecture is built around. It may be PROFIBUS, DeviceNet, Modbus, or CC-bbbb etc.
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