选定PLC的机型和分配I/O点后，硬件设计的主要内容就是电气控制系统的原理图的设计，电气控制元器件的选择和控制柜的设计。电气控制系统的原理图包括主电路和控制电路。控制电路中包括PLC的I/O接线和自动、手动部分的详细连接等。电器元件的选择主要是根据控制要求选择按钮、开关、传感器、保护电器、接触器、指示灯、电磁阀等。
1拟定控制系统设计的技术条件。技术条件一般以设计任务书的形式来确定，它是整个设计的依据；
A16B-2202-0640
SGM-02A3FJ23
机器人控制器已经被用于实现某些复杂机械设备的控制。大多数控制器都是为某个特定的设备定制生产，需要使用厂家自有的专门编程语言进行编程，这些编程语言因产品平台的不同而有很大的差异。如果机器人控制器用于控制其为之定制的对象，效率很高，但是在通讯性能、集成性能以及可编程能力方面则不是的。
国内PLC厂商能够确切了解中国用户的需求，并适时地根据中国用户的要求开发、生产适销对路的PLC产品。例如，和利时公司具有12年的控制类产品生产、销售及工程实施经验，积累了大量客户资源，了解国内不同行业、不同地区、不同所有制用户的真正需求，因此在产品设计时可以充分考虑中国用户的需求和使用习惯，产品的针对性和易用性更强。
输入接线还应特别注意：
按下开关以后，部分继电器时序图如图5-8所示。根据观察结果，补充其他继电器的时序图。
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