Editing Remote terminal unit (section)

===Software and logic control===
Modern RTUs are usually capable of executing simple programs autonomously without involving the host computers of the [[Distributed control system|DCS]] or [[SCADA]] system to simplify deployment and to provide redundancy for safety reasons. An RTU in a modern water management system will typically have code to modify its behavior when physical override switches on the RTU are toggled during maintenance by maintenance personnel.  This is done for safety reasons; a miscommunication between the system operators and the maintenance personnel could cause system operators to mistakenly enable power to a water pump when it is being replaced, for example.

Maintenance personnel should have any equipment they are working on disconnected from power and locked to prevent damage and/or injury.