The fieldbus standard requires busses to be terminated at both ends. In many applications, one terminator is built in to the power conditioner, which is usually located near to the control system. The second terminator is either integrated into the Megablock or fieldbus barrier wiring component or added in the form of a separate DIN-rail mounted unit.

Terminators are clearly marked with a large ‘T’ making them easy to identify in-situ.