Answer / khyati

All the signals from remote field devices (RTU) is terminated to the Master terminal Unit(MTU) via appropriate physical medium (wired or wireless). The field signals such as pump or motor f/b , digital switches or even analog signals (4-20 ma, 0-10 v etc)are terminated to basic level to RTU .There can be 'N' no. of RTU's placed in a system which carries all the field device status to the MTU.

Answer / manish

I think MTU is also known as Master terminal unit.
And its main purpose is to accept the diffrent inputs from
the Remotely connected devices and transmitt them over the
network

Answer / mussa

SCADA typical hardware includes an MTU placed at a control
center, communications equipment ( e.g., radio, telephone
line, cable, or satellite ), and one or more geographically
distributed filed sites consisting of either an RTU or a
PLC, which controls actuators and/or monitors sensors.

The MTU stores and processes the information from RTU inputs
and outputs, while the RTU or PLC controls the local process.

Answer / waqas

RTU is Remote Terminal Unit. RTU is the basic component of
SCADA that converts analog signals (either from some level
sensor, temperature sensor) to digital signals that can be
accepted at the PLC end.
MTU is Maximum Transmission Unit. It is the maximum size of
a data block that can be transmitted through any of
transmission protocol e.g. IP protocol.

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