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RVAR5512小型控制系统中的可编程控制器除了使用编程软件外,一般不需要与别的设备通讯。可编程控制器的编程器接口一般都是RS-422或RS-485,而计算机的串行通讯接口是RS-232C,编程软件与可编程控制器交换信息时需要配接的带转接电路的编程电缆或通讯适配器,例如为了实现编程软件与FX系列plc之间的程序传送,需要使用SC-09编程电缆。
无协议通讯
大多数可编程控制器都有一种串行口无协议通讯指令,如FX系列的RS指令,它们用于可编程控制器与上位计算机或其它RS-232C设备的通讯。
这种通讯方式为灵活,可编程控制器与RS-232C设备之间可以使用用户自定义的通讯规定,但是可编程控制器的编程工作量较大,对编程人员的要求较高。
如果不同厂家的设备使用的通讯规定不同,即使物理接口都是RS-485,也不能将它们接在同一网络内,在这种情况下一台设备要占用可编程控制器的一个通讯接口。
用各种RS232C单 元,包括个人计算机,条形码阅读器和打印机,来进行数据通讯,可通过无协议通讯完成,此通讯使用RS指令或一个FX2N-232IF特殊功能模块完成。
RVAR5512
RVAR5512
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