工业控制已从单机控制走向集中监控、集散控制，如今已进入网络时代，工业控制器连网也为网络管理提供了方便。Modbus就是工业控制器的网络协议中的一种。-Industrial control to centralized monitoring and control from the stand-alone, distributed control, and now has entered the Internet age, networked industrial controllers for network management more convenient. Modbus is the industrial controllers in a network protocol.