This Protocol is each communication port of FATEK PLC to communicate with the peripherals under standard mode. Any peripherals that want to communicate with FATEK PLC model have to meet the rules, not only the hardware connection but also the software parameter setting. Besides, the message format also has to be the same with this protocol so that the PLC can respond normally.

Modbus is a serial data communication protocol used in multiple client-server applications to monitor & program devices to communicate between intelligent devices, sensors and instruments to monitor field devices using PCs, HMIs & PLCs.

Profi net (usually styled as PROFINET, as a portmanteau for Process Field Net) is an industry technical standard for data communication over Industrial Ethernet, designed for collecting data from, and controlling equipment in industrial systems, with a particular strength in delivering data under tight time constraints.

Ether CAT (Ethernet for Control Automation Technology) is an Ethernet-based fieldbus system. The goal during development of Ether CAT was to apply Ethernet for automation applications requiring short data update times (also called cycle times; ≤ 100 μs) with low communication jitter (for precise synchronization purposes; ≤ 1 μs) and reduced hardware costs.