PLC模块6ES7414-2XJ01-0AB0 S7-400可编程控制器
PLC模块6ES7414-2XJ01-0AB0 S7-400可编程控制器
PLC模块6ES7414-2XJ01-0AB0 S7-400可编程控制器
用户存储器包括用户程序存储器（程序区）和数据存储器（数据区）两部分。用户程序存储器用来存放用户针对具体控制任务采用PLC编程语言编写的各种用户程序。用户程序存储器根据所选用的存储器单元类型的不同（可以是RAM、EPROM或EEPROM存储器），其内容可以由用户修改或增删。用户数据存储器可以用来存放（记忆）用户程序中所使用器件的ON/OFF状态和数据等。用户存储器的大小关系到用户程序容量的大小，是反映PLC性能的重要指标之一。
为了便于读出、检查和修改，用户程序一般存于CMOS静态RAM中，即随机存储器，主要存储工作数据，掉电数据丢失，供电断经常和备用电池和超级电容连接，以实现掉电数据保持。保证掉电时不会丢失信息。为了防止干扰对RAM中程序的破坏，当用户程序经过运行正常，不需要改变，可将其固化在只读存储器EPROM中。现在有许多PLC直接采用EEPROM作为用户存储器。
工作数据是PLC运行过程中经常变化、经常存取的一些数据。存放在RAM中，以适应随机存取的要求。在PLC的工作数据存储器中，设有存放输入输出继电器、辅助继电器、定时器、计数器等逻辑器件的存储区，这些器件的状态都是由用户程序的初始设置和运行情况而确定的。根据需要，部分数据在掉电时用后备电池维持其现有的状态，这部分在掉电时可保存数据的存储区域称为保持数据区。
由于系统程序及工作数据与用户无直接联系，所以在PLC 产品样本或使用手册中所列存储器的形式及容量是指用户程序存储器。当PLC提供的用户存储器容量不够用，许多PLC还提供有存储器扩展功能。
PLC存储器所用的种类主要有：可读/写操作的随机存储器RAM；只读存储器或可擦除可编程的只读存储器ROM、PROM 、EPROM 和EEPROM。
4：运行指示灯，是判断PLC运行正常与否的主要依据。西门子S7-200在正常运行当中只有RUN灯（绿灯）亮，停止状态只有STOP灯（黄灯）亮，如果有故障灯（红灯）亮起，说明此时PLC已经出现硬件故障或软件故障。
远程控制：您可以通过调制解调器呼叫消息和实测值，以及定义新的设定点或命令。在这种情况下，一个基站S7- 200可以控制几乎无限数量的远程站点。可以自由选择数据传输的协议，例如：文字信息直接到手机上，错误信息到机或Modbus RTU。快速PROFIBUS连接通过EM277通讯模块可以运行222以上有CPU，作为PROFIBUS DP网络上的标准从站，传输速率高达12 Mbit/s。S7- 200对更高水平PROFIBUS DP控制水平的开放特点，确保您可以将单台机器集成到生产线中。使用EM 277扩展模块，您可以实现配备了S7-200的单独机器的PROFIBUS能力。
设计和功能内置的RS485接口可以工作在数据传输速率高达187.5 kbit / s的情况下工作，其功能如下：作为一个大拥有126个站点的系统线。在这种容量中，可以连网编程设备，SIMATIC HMI产品和SIMATIC CPU，没有任何问题。集成的PPI协议用于纯的S7- 200支持来自一个端口多台主机的网络。在西门子其他器件（SIMATIC S7-300/400和SIMATIC HMI等）组成的网络中，将S7- 200 CPU集成为MPI的从站。在Freeport模式（高达115.2kbaud）中，采用用户特定的协议（例如ASCII协议）这意味着SIMATIC S7 -200对连接的任何设备都是开放的，例如，它可以连接一个调制解调器，条码扫描仪，PC，非西门子PLC等等。通过驱动器用的USS协议，多可以控制32台西门子变频器，无需额外的硬件。包括在该包中的Modbus RTU库还可以作为主站或从站连接到一个Modbus RTU网络。带有PC Access的OPC驱动器PC Access是S7- 200和连接PC之间数据交换的理想基础-与通讯链路选择无关（PPI，调制解调器，以太网/IT CP）。作为一个OPC服务器，PC ACCESS使您可以使用Microsoft Excel写或读S7- 200数据，或任何其它OPC客户端应用程序。
西门子全集成驱动系统实现了三个维度集成：横向集成、纵向集成和生命周期集成。每个驱动系统组件都能集成到整个系统中，集成到 TIA 自动化环境中，涵盖整个生命周期，实现从工程到服务的优化使用。，横向集成，即驱动链产品线层面。全集成驱动系统，意味着可"一站式"提供变频器、电机、联轴器以及齿轮箱，实现无缝集成，协同。涵盖有功率范围和性能等级。既可提供标准解决方案，也可进行定制。第二，纵向集成，即 TIA 集成层面。全集成驱动系统能够无缝适用于任何自动化环境：从现场层到控制器层，再到 MES 层，适用于各种应用，独树一帜。第三，生命周期层面。涵盖整个生命周期的丰富软件工具和服务：从产品设计、生产规划、生产工程，到生产实施，直到服务。从而可确保的性能和更佳投资保护，实现高生产力、可靠性和效率。
进行隔离是防止电流在两个通讯点之间流动的一-种方法。-般在两种情况下采用隔离:第
-种情况是，在有可能存在损坏设备或危害人员的潜在的电流浪涌时。第二种情况是必须避免
存在不同地电位和分裂的接地回路的互连。两种情形都是采用隔离来避免电流流过，而允许两
点之间有数据或功率传送。隔离应用涉及高电压、高速/高精度通信、或者长距离通信。普通
的例子如工业IO系统、传感器接口、电源/调节杆，发动机控制/驱动系统以及仪器仪表。
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