可编程控制器网络的CAN总线节点的设计

Design of CAN Bus Node Based on Programmable Controller Network

作为自动化领域的计算机局域网,CAN总线越来越多的被应用于各控制领域中;同时,可编程控制器(PLC)在生产现场的稳定应用也使得其地位不可代替。将PLC网络作为CAN总线的一个节点,实现两者间信息的共享具有非常好的前景。以三菱FX系列PLC为例,在其计算机链接(RS-485)的基础上提出了基于单片机的CAN节点,作为CAN的一个低速节点,在控制与通信上均取得了很好的效果。

In the computer local area network which lies in the field of automation,the CAN field bus is being used more and more in various areas of control.Meanwhile,the stable applications of Programmable Logic Controller(PLC)at the production scene make it irreplaceable.It has good prospects to realize the sharing of information between CAN bus and PLC networks.This paper takes Mitsubishi FX series PLC for instance,on the basis of its links to computer,propounds a CAN node which based on single chip,and qua a low-speed node,it achieves good results on control and communication.