The ABB TB815 Interconnection Unit​ is a specialized terminal block interface module designed for structured signal distribution and interconnection within ABB’s industrial control and automation systems. Functioning as a central wiring hub, it provides organized, reliable termination points for field signals, internal system buses, and power distribution, facilitating clean installation, easier maintenance, and enhanced system reliability in complex control environments.

In a pharmaceutical manufacturing clean room, a distributed control system (DCS) manages hundreds of sensors monitoring temperature, pressure, flow, and valve positions. Each sensor’s 4-20mA signal must be routed from field junction boxes to the appropriate I/O card in the control rack, with proper isolation, fusing, and test points. Without proper organization, this becomes a “spaghetti” wiring nightmare that’s impossible to troubleshoot. The ABB TB815 Interconnection Unit​ installed in each control rack provides the structured solution. Field cables terminate on one side of the unit, while pre-fabricated harnesses connect the other side directly to the I/O cards. The unit includes fuse holders for each channel, test points for calibration verification, and clear labeling strips. When a flow transmitter needs calibration, a technician can easily isolate and test the loop at the TB815​ without disturbing the DCS wiring. This organization directly addresses critical pain points in installation quality, maintenance efficiency, and system availability.