With the spread of the Internet and the introduction of LAN and Wi-Fi in our homes, the term "network" has become common.
LANs are installed at the factory and information such as a daily production plan and shipment status is transmitted through the LANs.

This chapter describes FA networks different from general LANs.

• 1.1 Necessity of FA networks
• 1.2 FA network applications
• 1.3 Data communication methods of FA networks
• 1.4 Cyclic transmission operation
• 1.5 Data update for cyclic transmission (remote I/O)