What is the role of the MTU (Master Terminal Unit) in an industrial telemetry system?

• A. Graphical user interface on operator's station.
• B. Encryption algorithm.
• C. Central data collection and control unit that receives data from field devices, stores data, and forwards to SCADA.
• D. Small battery powered sensor in the field.

Answer: (C)

In an industrial telemetry setup, the MTU acts as the central data collection and control hub. It collects measurements from field devices, stores the data locally, and forwards it to the SCADA system for monitoring, analysis, and control. This role makes the MTU the data backbone of the system, handling buffering, storage, and communication to the supervisory layer.

This isn’t a graphical user interface used by operators, nor an encryption routine, nor a small battery-powered field sensor. The GUI is just the display/interaction layer on an operator’s workstation, encryption protects data, and a field sensor is a device that measures a specific parameter. The MTU sits between field devices and SCADA, coordinating data flow and providing a central point for data management.