The FOXBORO P0973CA (model FEM100) is a Fieldbus Expansion Module designed exclusively for the Foxboro I/A Series DCS, specifically to work with the FCP270 Field Control Processor. It expands the system's I/O capacity by providing four high-speed Expanded Fieldbus links. Each link supports up to 32 200 Series FBM (Fieldbus Module) I/O cards, enabling connection to a maximum of 128 FBMs per redundant FEM100 pair.