西门子S7-200 小型可编程控制器

西门子S7-200针对低性能要求的摸块化小控制系统，它多可有7个模块的扩展能力，在模块中集成背板总线，它的网络联接有rs-485通讯接口和profibus两种，可通过编程器pg访问所有模块，带有电源、cpu和i/o的一体化单元设备。其中的扩展模块(em)有以下几种：数字量输入模块(di)——24vdc和120/230vac;数字量输出(do)——24vdc和继电器;模拟量输入模块(ai)——电压、电流、电阻和热电偶;模拟量输出模块——电压和电流。还有一个比较特殊的模块-通讯处理器(cp)——该块的功能是可以把s7-200作为主站连接到as-接口(传感器和执行器接口)，通过as-接口的从站可以控制多达248个设备，这样就可以显着的扩展s7-200的输入和输出点数。

西门子S7-300 中型可编程控制器


西门子S7-300相比较s7-200，s7-300针对的是中小系统，他的模块可以扩展多达32个模块，背板总线也在模块内集成，它的网络连接已比较成熟和流行，有mpi、工业以太网，使通讯和编程变得简单，选择性也比较多，并可借助工具进行组态和设置参数。s7-300的模块稍微多一点，除了信号模块(sm)和200的em模块同类型之外，它还有接口模块(im)——用来进行多层组态，把总线从一层传到另一层;占位模块(dm)——为没有设置参数的信号模块保留一个插槽或为以后安装的接口模块保留一个插槽;功能模块(fm)——执行特殊功能，如计数、定位、闭环控制相当于对cpu功能的一个扩展或补充;通讯处理器(cp)——提供点对点连接、profibus和工业以太网。针对cpu设计模式选择器有：mres=模块复位功能;stop=停止模式，程序不执行;run=程序执行，编程器只读操作;run-p=程序执行，编程器可读写操作。状态指示器：sf，batf=电池故障;dc5v=内部5vdc电压指示;frce=表示至少有一个输入或输出被强制;run=当cpu启动时闪烁，在运行模式下常亮;stop=在停止模式下常亮，有存储器复位请求时慢速闪烁，正在执行复位时快速闪烁。mpi接口用来连接到编程设备或其它设备，dp接口用来直接连接到分布式i/o。

西门子S7-400系列可编程控制器

西门子S7-400同300的区别主要在于热启动(wrst)这一部分，其他基本一样。它还有一个外部的电池电源接口，当在线更换电池时可以向ram提供后备电源。编程设备主要有pg720pg740pg760——可以理解成装有编程软件的手提电脑;也可以直接用安装有step7(siemens的编程软件)的pc来完成。而实现通讯(要编程首先要和plc的cpu通讯上)的要求主要在于接口：1.可以在pc上装cp5611卡——上面有mpi口，可用电缆直接连接。2.加个pc适配器，把mpi口转换成rs-232口后接到pc上。3.plc加cp343卡，使它具有以太网口。

西门子S7-1200 小型可编程控制器

西门子SIMATIC S7-1200是一款紧凑型、模块化的PLC，可完成简单逻辑控制、逻辑控制、HMI 和网络通信等任务 。
单机小型自动化系统的*解决方案。 对于需要网络通信功能和单屏或多屏HMI的自动化系统，易于设计和实施。
具有支持小型运动控制系统、过程控制系统的应用功能
新的模块化SIMATIC S7-1200控制器是我们新推出产品的核心，可实现简单却高度精确的自动化任务。SIMATIC S7-1200 控制器实现了模块化和紧凑型设计，功能强大、投资安全并且完全适合各种应用。

可扩展性强、灵活度高的设计，可实现标准工业通信的通信接口以及一整套强大的集成技术功能，使该控制器成为完整、全面的自动化解决方案的重要组成部分。 

使用完全集成的新工程组态 SIMATICSTEP 7 Basic，并借助 SIMATIC WinCC Basic 对 SIMATIC S7-1200 进行编程。SIMATIC STEP 7 Basic 的设计理念是直观、易学和易用。这种设计理念可以使您在工程组态中实现效率。一些智能功能，例如直观编辑器、拖放功能和“IntelliSense”（智能感知）工具，能让您的工程进行的更加迅速。这款新软件的体系结构源于对未来创新的不断追求，西门子在软件开发领域已经有很多年的经验，因此 SIMATIC STEP 7 的设计是以未来为导向的 。

SIMATIC S7-1200 系统有五种不同模块，分别为 CPU 1211C、CPU 1212C 、 CPU 1214C、CPU1215C和CPU1217C。其中的每一种模块都可以进行扩展，以完全满足您的系统需要。可在任何 CPU 的前方加入一个信号板，轻松扩展数字或模拟量 I/O，同时不影响控制器的实际大小。可将信号模块连接至 CPU 的右侧，进一步扩展数字量或模拟量 I/O 容量。CPU 1212C 可连接 2 个信号模块，CPU 1214C 、CPU1215C和CPU1217C可连接 8 个信号模块。，所有的 SIMATIC S7-1200 CPU 控制器的左侧均可连接多达 3 个通讯模块，便于实现端到端的串行通讯。

西门子S7-1500可编程控制器

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