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1、第八讲：PLC模块PLC Module 制作人：姚薇Huaian College of Information Technology2022-5-21第八讲：第八讲：PLC 模块模块 The S7-200 continuously cycles through the control logic in your program, reading and writing data.-The S7-200 reads the status of the inputs.-The program that is stored in the S7-200 uses these inputs to eva
2、luate the control logic. As the program runs, the S7-200 updates the data.-The S7-200 writes the data to the outputs.2022-5-21第八讲：第八讲：PLC 模块模块 In this Start / Stop Switch example, the state of the switch for starting the motor is combined with the states of other inputs. The calculations of these st
3、ates then determine the state for the output that goes to the actuator which starts the motor.参考译文：在本例中，电机启动开关的状态和其它输入点的状态结合在一起。它们计算的结果，最终决定了控制执行机构启动电机的输出点状态。Switch：n.开关，电闸，转换；vt.转换，转变states of other inputs：其他输入状态calculations：n.计算，考虑actuator：n 执行机构2022-5-21第八讲：第八讲：PLC 模块模块 Tasks in a Scan CycleReadi
4、ng the inputs: The S7-200 copies the state of the physical inputs to the process-image input registerprocess-image input register：输入过程映像寄存器Executing the control logic in the program: The S7-200 executes the instructions of the program and stores the values in the various memory areas.instructions of
5、 the program：程序指令读输入：S7-200将物理输入点上的状态复制到输入过程映象寄存器中。memory areas：存储区域 执行逻辑控制程序： S7-200执行程序指令并将数据存储在各种存储区中。2022-5-21第八讲：第八讲：PLC 模块模块 Processing any communications requests: The S7-200 performs any tasks required for communications.Tasks in a Scan Cyclecommunications：n.通信处理通讯请求：S7-200执行通讯任务 Executing t
6、he CPU self-test diagnostics :The S7-200 ensures that the firmware, the program memory, and any expansion modules are working properly.self-test diagnostics自诊断:expansion modules: 扩展模块执行CPU自诊断： S7-200检查固件、程序存储器和扩展模块是否工作正常。2022-5-21第八讲：第八讲：PLC 模块模块 Writes to the outputs： The values stored in process-i
7、mage output register are written to the physical outputs.Tasks in a Scan Cycle写输出：在输出过程映象寄存器中存储的数据被复制到物理输出点physical outputs: 物理输出2022-5-21第八讲：第八讲：PLC 模块模块 There are many methods for designing a Micro PLC system. The following general guidelines can apply to many design projects. Of course, you must
8、follow the directives of your own companys procedures and the accepted practices of your own training and location.general guidelines：一般的指导方针design projects：设计规划，设计计划directives: n.指示 procedures: n.程序，手续practices of: 有.习惯 以下这些通用的指导原则适用于许多设计项目。当然，您所在公司的规程和您在培训中接受的实践经验是必须遵循的。2022-5-21第八讲：第八讲：PLC 模块模块 1. Partition Your Process or Machine2. Create the Functional Specifications3. Design the Safety Circuits4. Specify the Operator Stations5. Create the Configuration Drawings6. Create a List of Symbolic Names (optional)分解控制过程或者机器创建功能说明安全电路的设计指定操作员站创建配置图建立符号名表（可选）