如何将编程程序写入读出及PLC与PC连接？90%的电气人都收藏了！
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PLC与计算机连接需要用到通信电缆，常用电缆有两种：一种是FX-232AWC-H（简称SC09）电缆，如图所示，该电缆含有RS-232C/RS-422转换器；另一种是FX-USB-AW（又称USB-SC09-FX）电缆，如图所示，该电缆含有USB/RS-422转换器。
在选用PLC编程电缆时，先查看计算机是否具有COM口（又称RS-232C接口），因为现在很多计算机已经取消了这种接口，如果计算机有COM接口，可选用FX-232AWC-H电缆连接PLC和计算机。在连接时，将电缆的COM头插入计算机的COM接口，电缆另一端圆形插头插入PLC的编程口内。
如果计算机没有COM接口，可选用FX-USB-AW电缆将计算机与PLC连接起来。在连接时，将电缆的USB头插入计算机的USB接口，电缆另一端插入PLC的编程口内。将FX-USB-AW电缆插到计算机USB接口时，还需要在计算机中安装这条电缆配带的驱动程序。驱动程序安装完成后，在计算机中选择“设备管理器”，弹出设备管理器窗口，如图所示，展开其中的“端口（COM和LPT）”，从中可以看到一个虚拟的COM端口，图中为COM3，记住该编号，在works2软件进行通信参数设置时要用到。
用编程电缆将PLC与计算机连接好后，在启动works2软件，打开或新建一个工程，再执行菜单栏命令“工程数据列表区→连接目标”，再选择当前连接目标，弹出连接目标设置对话框，双击左上角的“串行usb”图标，出现出现详细的设置对话框，如图所示，在该对话框中选中“RS-232C”项，COM端口一项中选择与PLC连接的端口号，使用FX-USB-AW电缆连接时，端口号应与设备管理器中虚拟的COM端口号一致，在传输速度上选择某个速度（如选19.2kbps），单击确定返回连接目标设置对话框，如果想知道PLC与计算机是否连接成功，可在连接目标设置中点击通信测试按钮，若出现图中所示对话框，表示连接失败，则要重新选择COM端口。
程序的写入是指将程序由编程计算机送入PLC，读出则是将PLC内的程序传送到计算机中。程序的读出操作过程与写入基本类似，可参照学习，这里不做介绍。在对PLC进行程序写入或者读出时，除了要保证PLC与计算机通信连接成功外，PLC还需要接上工作电源。
在works2软件中将程序写入PLC后，如果希望看见程序在实际PLC中的运行情况，可使用软件的在线监视功能，该功能使用时，应确保PLC与计算机间通信电缆连接正常，PLC供电正常。
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