Most modern PLCs use communication and network technology,and have RS-232 or RS-485 interfaces for remote I/O control.Multiple PLCs can be networked and communicated with each other,and programs and data can be exchanged between external devices and the signal processing units of one or more programmable controllers,such as program transfer,data file transfer,monitoring and diagnosis.The communication interface or communication processor completes the transfer of programs and data according to a standard hardware interface or a proprietary communication protocol.
现代PLC大多数都采用了通信、网络技术,有RS-232或RS-485接口,可进行远程I/O控制。多台PLC彼此间可以联网、通信,外部器件与一台或多台可编程控制器的信号处理单元之间可以实现程序和数据交换,如程序转移、数据文档转移、监视和诊断。通信接口或通信处理器按标准的硬件接口或专有的通信协议完成程序和数据的转移。
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1943 Press Photo Charles Sorensen Ford Motor Principal
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