SCADA systems typically have four major elements:
1. Master Terminal Unit (MTU)
2. Remote Terminal Unit (RTU)
3. Communication Equipment
4. SCADA Software
1. Master Terminal Unit (MTU)
The Master Terminal Unit is usually defined as the master or heart of a SCADA system and is located at the operators central control facility. The MTU initiates virtually all communication with remote sites and interfaces with an operator. Data from remote field devices (pumps, valves, alarms, etc.) is sent to the MTU to be processed, stored and/or sent to other systems. For example, the MTU may send the data to the operators display console, store the information, and then send an operators initiate command to a field pumps RTU.
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