The 1783-SFP100FX is a module manufactured by Rockwell Automation. Specifically, it is a Small Form-factor Pluggable (SFP) module designed for use with Rockwell Automation's Ethernet switches. 

The 1783-SFP100FX module supports Fast Ethernet (100 Mbps) communication over fiber optic cables. It is commonly used in industrial networking applications where there is a need to extend the Ethernet network over longer distances or in environments where electrical noise or other harsh conditions may affect the performance of copper-based Ethernet connections.

This module is compatible with various Rockwell Automation switches and can provide a reliable and secure connection for Ethernet communication. It utilizes the 100BASE-FX standard for transmitting and receiving data over multimode or single-mode fiber optic cables, depending on the specific model.

Overall, the 1783-SFP100FX Rockwell module is a popular choice for industrial networking applications, providing flexibility and performance in Ethernet connectivity solutions.