6FX1144-2BA00

详情描述：

PLC控制系统设计时应遵循的主要步骤和内容
　　（1）工艺分析
　　深入了解控制对象的工艺过程、工作特点、控制要求，并划分控制的各个阶段，归纳各个阶段的特点，和各阶段之间的转换条件，画出控制流程图或功能流程图。
　　（2）选择合适的PLC类型
　　在选择PLC机型时，主要考虑下面几点：
　　1功能的选择。对于小型的PLC主要考虑I/O扩展模块、A/D与D/A模块以及指令功能（如中断、PID等）。
　　2I/O点数的确定。统计被控制系统的开关量、模拟量的I/O点数，并考虑以后的扩充（一般加上10%～20%的备用量），从而选择PLC的I/O点数和输出规格。
　　3内存的估算。用户程序所需的内存容量主要与系统的I/O点数、控制要求、程序结构长短等因素有关。一般可按下式估算：存储容量=开关量输入点数?10 开关量输出点数?8 模拟通道数?100 定时器/计数器数量?2 通信接口个数?300 备用量。
（3）分配I/O点。分配PLC的输入/输出点，编写输入/输出分配表或画出输入/输出端子的接线图，接着就可以进行PLC程序设计，同时进行控制柜或操作台的设计和现场施工。
　　（4）程序设计。对于较复杂的控制系统，根据生产工艺要求，画出控制流程图或功能流程图，然后设计出梯形图，再根据梯形图编写语句表程序清单，对程序进行模拟调试和修改，直到满足控制要求为止。
　　（5）控制柜或操作台的设计和现场施工。设计控制柜及操作台的电器布置图及安装接线图；设计控制系统各部分的电气互锁图；根据图纸进行现场接线，并检查。
　　（6）应用系统整体调试。如果控制系统由几个部分组成，则应先作局部调试，然后再进行整体调试；如果控制程序的步序较多，则可先进行分段调试，然后连接起来总调。
　　（7）编制技术文件。技术文件应包括：可编程控制器的外部接线图等电气图纸，电器布置图，电器元件明细表，顺序功能图，带注释的梯形图和说明。
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