GE通用电气 VMIVME 1128 PLC系统备件 模块卡件 伺服控制器

GE通用电气 VMIVME 1128 PLC系统备件 模块卡件 伺服控制器

    (1)可靠性高。由于PLC大都采用单片微型计算机，因而集成度高，再加上相应的保护电路及自诊断功能，提高了系统的可靠性。

　　(2)编程容易。PLC的编程多采用继电器控制梯形图及命令语句，其数量比微型机指令要少得多，除中、高档PLC外，一般的小型PLC只有16条左右。由于梯形图形象而简单，因此容易掌握、使用方便，甚至不需要计算机知识，就可进行编程。

　　(3)组态灵活。由于PLC采用积木式结构，用户只需要简单地组合，便可灵活地改变控制系统的功能和规模，因此，可适用于任何控制系统。

　　(4)输入/输出功能模块齐全。PLC的优点之一，是针对不同的现场信号(如直流或交流、开关量、数字量或模拟量、电压或电流等)，均有相应的模板可与工业现场的器件(如按钮、开关、传感电流变送器、电机启动器或控制阀等)直接连接，并通过总线与CPU主板连接。

　　(5)安装方便。与计算机系统相比，PLC的安装既不需要专用机房，也不需要严格的屏蔽措施。使用时只需把检测器件与执行机构和PLC的I/O接口端子正确连接，便可正常工作。

　　(6)运行速度快。由于PLC的控制是由程序控制执行的，因而不论其可靠性还是运行速度，都是继电器逻辑控制无法相比的。

(1) High reliability. Because PLC mostly uses a single chip microcomputer, so the integration is high, coupled with the corresponding protection circuit and self-diagnosis function, improve the reliability of the system.

(2) Easy programming. PLC programming uses relay control ladder diagram and command statements, the number is much less than the microcomputer instructions, in addition to the middle and high-end PLC, the general small PLC only about 16. Because the ladder diagram is simple and simple, it is easy to master and easy to use, and it can be programmed without computer knowledge.

(3) Flexible configuration. Because the PLC adopts the building block structure, the user only needs to simply combine, and can flexibly change the function and scale of the control system, so it can be applied to any control system.

(4) Complete input/output function modules. One of the advantages of PLC is that for different field signals (such as DC or AC, switching quantity, digital quantity or analog quantity, voltage or current, etc.), there are corresponding templates that can be directly connected with industrial field devices (such as buttons, switches, sensing current transmitters, motor starters or control valves, etc.), and connected to the CPU motherboard through the bus.

(5) Easy to install. Compared with computer systems, the installation of PLC does not require a dedicated computer room, nor does it require strict shielding measures. When used, only the detection device and the I/O interface terminals of the actuator and PLC are correctly connected to work normally.

(6) Fast running speed. Because PLC control is executed by program control, regardless of its reliability or running speed, relay logic control can not be compared.