PLC在变频恒压供水系统中的应用

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In a programmable controller system, the central processing unit (CPU) provides both the heart and the brain required for successful and timely control execution. It rapidly and efficiently scans all of the system inputs, examines and solves the application logic, and updates all of the system outputs. In addition ,it also gives itself a checkup each scan to ensure that its structure is still intact. Included will be the various functional blocks in the CPU, typical scan techniques, I/O interface and memory uses, power supplies, and system diagnostics.
It is this attribute that makes programmable controllers the powerhouses that they are today in solving tough factory automation problems. The factory of tomorrow will run efficiently only if quality information about process needs and status of the process equipment are known on a realtimes basis. This can and will come about only if the unit level controllers, including programmable controllers, are empowered with the ability to collect, analyze, concentrate, and deliver data about the process. As the market continues to exhibit this demand, manufactures are likely to continue to outfit their controllers with more and more variable memory, and enhanced instruction sets to perform these tasks.

在一个可编程序的控制器系统，中央处理单元(CPU)提供了成功和实时性完成控制系统施行所必需的大脑和中枢系统。它快速并高效率地扫描所有系统输入信号，检查并处理可应用的逻辑部件，并且更新所有的系统输出信号。另外，它本身也也有自检功能来扫瞄以确保，它的构造是原封的。在这整个系统中，包括CPU的各种各样的功能模块，典型的扫瞄技术，I/O 接口和应用存储器、电源和系统诊断。
正是可编程序的控制器高智能这个属性使他们今天能解决复杂的工厂自动化问题。工厂的将来只有在过程需要的高质量信息和处理设备的状态为人所知根据的基础上才能高效率地运行。这只有在液面调解器中能实现，包括可编程序的控制器采集的能力，并且提供传递过程数据的功能。当市场继续需求这种功能，制造商可能继续以越来越易变的存储器装备他们的控制器，并且改进指令组来执行这些任务。
由定义和设计，可编程序的控制器致力于连续，反复的审查系统输入任务，解决当前的控制逻辑，并且更新系统输出。这项任务指扫描(有时叫清扫)，并且在各位制造商的可编程序的控制器中采用轻微地不同的方式来完成。 因此许多变异不是系统的基本功能，我们只将审查其中基本的种类。

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