The ABB TB820v2 3BSE013208R0001​ is a Terminal Base module manufactured by ABB for the S800L Remote I/O system, a core component of the ABB 800xA and Advant MOD 300 DCS. It serves as the physical and electrical interface between an S800L I/O module and the field wiring. This base unit provides the secure mounting, terminal connections for field devices, and the internal pathway for signals and power between the field and the intelligent I/O module that plugs into it.

In a pharmaceutical cleanroom, precise control of HVAC variables (temperature, pressure, humidity) is critical. Dozens of analog input signals from high-accuracy sensors and analog output signals to control valves need to be connected to the DCS. An S800L I/O station is installed in a nearby marshalling cabinet. For each analog input point, an ABB TB820v2 3BSE013208R0001​ terminal base is mounted on a DIN rail. A corresponding S800L AI (Analog Input) module is then plugged onto this base. The field wires from the 4-20mA temperature transmitter are landed directly on the sturdy screw terminals of the TB820v2​ base. The base internally routes this signal to the AI module’s electronics, which digitizes it and sends it over the fieldbus to the controller. This setup provides a clean, organized, and serviceable interface. The TB820v2​ solves the critical need for a reliable, high-density, and maintainable connection point that separates the expensive, intelligent I/O module from the physical stresses and potential errors of field wiring.