Opal Internet uses AOPRE-LINK8248、AOPRE-LINK8880、AOPRE-LINK8416 in the monitoring solution of iron and steel automatic production line.The industrial Ethernet switch builds the internal communication network of each workshop, and the ring network is built inside the workshop through aopre-link8280 Gigabit Industrial Ethernet. The actual stations are reasonably distributed, and the data between workshops are logically isolated through virtual LAN technology to ensure the security of communication.