Foxboro I/O Cards, also known as fieldbus modules (FBMs), are critical components of the Foxboro I/A Series Distributed Control System (DCS). These modules act as the interface between the DCS and field devices, facilitating data acquisition, control signal transmission, and process health monitoring.
Types of Foxboro I/O Cards
Analog Input Cards:
Function: Convert analog signals from field devices (e.g., temperature transmitters, pressure sensors) into digital signals for the DCS.
Application: Used for measuring variables like temperature, pressure, and flow.
Analog Output Cards:
Function: Convert digital control signals from the DCS into analog signals to control actuators (e.g., valves, motors).
Application: Used for precise control of processes that require variable output.
Discrete Input Cards:
Function: Receive digital signals from field devices (e.g., switches, limit sensors) indicating the status of process parameters.
Application: Used for monitoring on/off status or binary conditions in the process.
Discrete Output Cards:
Function: Send digital control signals to field devices (e.g., relays, solenoids) to activate or deactivate specific components.
Application: Used for controlling binary outputs, such as starting/stopping motors or opening/closing valves.
