Real-time communication between Personal Computer and Programmable Logic Controller for Networked Control System based on Industrial Ethernet

摘要

Networked Control System (NCS) based communication system Industrial Ethernet (IE) becoming very popular for automation system. The Fast Ethernet system with data rate transfer 100Mb/s is used for this project. Star topology with the hub connected to Personal Computer (PC) and the others two Programmable Logic Controller (PLC) are analysis for the real-time communications. Real-time communication for the system are very good without no disconnected between PC and PLC. Data rate transfer is Okbit/s when the communications between PC and the others two PLC are idle. When the realtime communication is on between PC and PLC A with PCL B are idle, the data rate transfer shows 57 kbit/s. Meanwhile when the PC connected to the PLC B with PLC A are idle, the data rate transfer shown from the PC are 65 kbit/s. The other situations can be taken are when the PC connected to the PLC A and PLC B, the data rate transfer for the real time communication show 115 kbit/s. The highest data rate transfer shows from this project with 115 kbit/s are below the maximum data rate transfer IMbit/s for the PC with Fast Ethernet system.