Master Terminal Unit (MTU)
Master Terminal Unit (MTU)
A controller that also acts as a server that hosts the control software that communicates with lower-level control devices, such as remote terminal units (RTUs) and programmable logic controllers (PLCs), over an OT network. In a SCADA system, this is often called a SCADA server, MTU, or supervisory controller.
Source: NIST SP 800-82 Rev. 2 | Category: