※CP451-50 处理器模块 支持模件自我诊断、故障隔离

  在PLC体系规划时，首先应确认体系计划，下一步作业便是PLC的规划选型。挑选PLC,要是确认PL的生产厂家和PLC的具体类型。关于体系计划要求有分布式体系、远程)/0体系还需要考虑网络化通讯的要求。那么具体应该怎么挑选PLC呢?笔者以为应该有以下几方面的内容。

一、PLC生产厂家的挑选

确认PLC的生产厂家要应该考虑设备用户的要求、用户对PLC厂家的要求规划者对PLC的了解程度和规划习气、配套户品的一致性以及技术服务等方面的因素。从PLC本身的可靠性考虑，准则上只要是国外大公司的产品，不应该存在可靠性欠好的问题。关于要求不高的，可选用高性价比的国产产品。笔者个人以为，一般来说，关于操控独立设备或较简略的操控体系的场合，配套日本的PLC产品，也能够挑选西门子的产品，因为对该产品了解的人比较多。关于体系规模较大网络通讯功用要椅、开放性的分布式澡控体系、远程/O体系，欧美生产的PLCc在网络通讯功用上更有优势。二、输入输出(/O)点数的预算

PLC的输入/输出点数是PC的根本参数之一。/O点数的确认应以操控设备所需的一切输入√输出点数的总和为依据。在-般情况下，PLC的/O点应该有适当的余量。-股依据计算的输入输出点数，再添加30%可扩展余量。

三、PLC存储器容的预算

存情髅容量是指可编程序操控器本身能供给的硬件存储单元大小，各种PLC的存情器容显大小能够从该PLC的根本参数表中找到，例如西门子的S7-314PLC的用户程序存储容量为64KB,S7-315-2DPPLC的用户程序存储容为128KB。程序容量是存情器中用户程序所使用的存临单元的大小，因而存情器容量应大于程序容量。规划阶段，因为用户使用程序还未缤制，因而，需要对程序容迸行预算。适当添加容量。

由于一天当中的用水需求会有变化，CP451-50处理器模块·确保泵送系统在部分负载条件下有效运行非常重要。经过验证，增加一台变频器可以有效提高带有电机的泵送系统的部分负载效率。变频器可直接控制电机的速度和转矩，它可以确保电机保特更佳的工作效率，这比让电机全速运行以及使用阔门和节流阀来控制流量高效得多。通常来讲，使用变频器和高效电机可以节省25.30%的能源。

许多公共供水系统都会使用长达几十年的旧电机，而这些旧日电机能效等级通常较低。升级成更加高效的新电机可降低电机损耗，并进一步节约能源。每个IE等级都能减少20%的能籍，也就是说，IE4电机与IE3电机相比，CP451-50处理器模块能耗将减少20%。而像AB的E5同步磁阻电机。(SynRM这样的超高效率E5电机来讲，减少的总能耗可高达40%。因此，更换旧电机(即侵旧电机能正常使用)通常仅在几年后就能收回成本。

In the PLC system planning, the system plan should be confirmed first, and the next step is the PLC planning and selection. Select PLCS, if you confirm the manufacturer of PL and the specific type of PLC. Regarding the system plan, there are distributed system, remote)/0 system, and the requirements of network communication need to be considered. So how to select PLC? I think there should be the following aspects of the content.

First, the selection of PLC manufacturers

Confirm that the PLC manufacturer should consider the requirements of equipment users, user requirements for PLC manufacturers planners of PLC understanding and planning habits, the consistency of supporting household products and technical services and other factors. From the reliability of PLC itself, as long as the standards are products of large foreign companies, there should not be poor reliability problems. For those with low requirements, cost-effective domestic products can be selected. The author personally believes that, in general, on the occasion of controlling independent equipment or a simpler control system, supporting Japanese PLC products, you can also choose Siemens products, because there are more people who know about the product. Regarding the larger network communication function of the system, the open distributed shower control system, and the remote /O system, the PLCc produced in Europe and the United States has more advantages in the network communication function. 2. Budget of input and output (/O) points

The number of PLC input/output points is one of the fundamental parameters of PC. The confirmation of /O points shall be based on the sum of all input √ output points required to operate the device. In general, the PLC /O point should have an appropriate margin. - Add 30% expandable margin based on calculated input and output points.

Three, PLC memory capacity budget

The memory capacity refers to the programmable controller itself can supply the size of the hardware storage unit, the memory capacity of various PLC can be found from the basic parameter table of the PLC, such as Siemens S7-314PLC user program storage capacity of 64KB,S7-315-2DPPLC user program storage capacity of 128KB. Program capacity is the size of the memory unit used by the user program in the memory, so the memory capacity should be greater than the program capacity. In the planning stage, because the user has not yet used the program, it is necessary to budget for the program. Add capacity appropriately.

As water demand varies throughout the day, it is important for the CP451-50 processor module to ensure that the pumping system operates efficiently under partial load conditions. It has been proved that adding a frequency converter can effectively improve the partial load efficiency of the pumping system with a motor. The frequency converter can directly control the speed and torque of the motor, which can ensure the motor to maintain the best efficiency, which is much more efficient than running the motor at full speed and using wide doors and throttle valves to control the flow. In general, the use of frequency converters and high-efficiency motors can save 25.30% of energy.

Many public water systems use decades-old motors, which often have lower energy efficiency ratings. Upgrading to a new, more efficient motor reduces motor losses and further saves energy. Each IE level can reduce the energy consumption by 20%, that is, the CP451-50 processor module will consume 20% less energy than the IE4 motor compared to the IE3 motor. And E5 synchronous reluctance motors like AB. For ultra-efficient E5 motors like SynRM, total energy consumption can be reduced by up to 40%. Therefore, replacing the old motor (that is, the old motor can be used normally) usually pays for itself after only a few years.

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