GE通用电气 VMIVME 1128 PLC系统备件 PLC模块卡件 伺服控制器

　　GE通用电气 VMIVME 1128 PLC系统备件 PLC模块卡件 伺服控制器

　　GE通用电气 VMIVME 1128 PLC系统备件 PLC模块卡件 伺服控制器

　　GE通用电气 VMIVME 1128 PLC系统备件 PLC模块卡件 伺服控制器

　　主营DCS配件,PLC模块：本特利,英维思,伍德沃德,福克斯波罗,西屋,瑞恩,施德,ABB,Motorola,GE，安川,等等各大品牌的PLC模块,机器人系统配件大型伺服系统备件

　　工控产品基本上都有

　　1、运算功能

　　简单可编程逻辑控制器的运算功能包括逻辑运算、计时和计数功能；普通可编程逻辑控制器的运算功能还包括数据移位、比较等运算功能；较复杂运算功能有代数运算、数据传送等；大型可编程逻辑控制器中还有模拟量的PID运算和其他高级运算功能。随着开放系统的出现，在可编程逻辑控制器中都已具有通信功能，有些产品具有与下位机的通信，有些产品具有与同位机或上位机的通信，有些产品还具有与工厂或企业网进行数据通信的功能。设计选型时应从实际应用的要求出发，合理选用所需的运算功能。大多数应用场合，只需要逻辑运算和计时计数功能，有些应用需要数据传送和比较，当用于模拟量检测和控制时，才使用代数运算，数值转换和PID运算等。要显示数据时需要译码和编码等运算。 [5]

　　2、控制功能

　　控制功能包括PID控制运算、前馈补偿控制运算、比值控制运算等，应根据控制要求确定。可编程逻辑控制器主要用于顺序逻辑控制，因此，大多数场合常采用单回路或多回路控制器解决模拟量的控制，有时也采用**的智能输入输出单元完成所需的控制功能，提高可编程逻辑控制器的处理速度和节省存储器容量。例如采用PID控制单元、高速计数器、带速度补偿的模拟单元、ASC码转换单元等。 [5]

　　3、通信功能

　　大中型可编程逻辑控制器系统应支持多种现场总线和标准通信协议（如TCP/IP），需要时应能与工厂管理网（TCP/IP）相连接。通信协议应符合ISO/IEEE通信标准，应是开放的通信网络。

　　1. Operation function

　　The operation functions of the simple programmable logic controller include logic operation, timing and counting functions; The operation function of common PLC also includes data shift, comparison and other operation functions; More complex operation functions include algebraic operation, data transmission, etc; Large programmable logic controller also has analog PID operation and other advanced operation functions. With the emergence of open systems, all programmable logic controllers have communication functions. Some products have communication with lower computer, some products have communication with same computer or upper computer, and some products also have the function of data communication with factory or enterprise network. The design and type selection shall be based on the requirements of practical application, and the required calculation functions shall be reasonably selected. In most applications, only logic operation and timing and counting functions are required. In some applications, data transmission and comparison are required. When used for analog quantity detection and control, algebraic operation, numerical conversion and PID operation are used. To display data, operations such as decoding and encoding are required. [5]

　　2. Control function

　　The control functions include PID control operation, feedforward compensation control operation, ratio control operation, etc., which shall be determined according to the control requirements. Programmable logic controllers are mainly used for sequential logic control. Therefore, single loop or multi loop controllers are often used in most occasions to control analog quantities, and sometimes special intelligent input and output units are used to complete the required control functions, so as to improve the processing speed of programmable logic controllers and save memory capacity. For example, PID control unit, high-speed counter, analog unit with speed compensation, ASC code conversion unit, etc. are used. [5]

　　3. Communication function

　　The large and medium programmable logic controller system shall support a variety of field buses and standard communication protocols (such as tcp/ip), and shall be able to connect with the plant management network (tcp/ip) when necessary. The communication protocol shall comply with iso/ieee communication standards and shall be an open communication network.