基于S7-200 PLC的Modbus主从站编程与应用

Programming and Application of Master/Slavery Station of Modbus Protocol Based on S7-200 PLC

从工程需求出发,提出了利用S7-200 PLC集成免费的Modbus RTU主站和从站通信库,以一个典型实例编程实现S7-200PLC作为工业自动化领域含Modbus通信协议的网络中间设备,具有很好的实用价值。

Programming application of master/slavery station of Modbus RTU protocol by S7-200 PLC is proposed originally from the engineering requirements. Due to its free and integrated Modbus RTU library, the S7-200 acts as a media device in the automation area including Modbus as a typical example. It shows that the method in this paper has a good practical value.