The MTU IIB1 (Part No. 5045309892) is a plug-in electronic board (PCB) used within MTU marine control and monitoring systems. It integrates as a module within the MCS-5 environment, forming part of the electronics that centralize and distribute operating information for the engine and connected onboard systems.

Functionally, the IIB1 serves as an instrumentation interface/input board (Instrument Input), supporting the acquisition and processing of field signals required for system monitoring and diagnostics. Its design is intended for robust integration in MTU electronic cabinets/panels, maintaining consistency with the modular architecture and simplifying maintenance and replacement with compatible spare parts.