Identify the functional group circled. 
Definitions:
Mechanical Timing Relays
Electromechanical devices that operate based on a timer mechanism to open or close contacts after a predetermined time delay. They are used in various applications, including control and automation systems.
PLC Timers
Refers to programmable logic controller timers, which are software-based clocks that enable time-based control in automation processes.
Input Instructions
Guidelines or commands given to a system or device specifying the data to be used for processing or operations.
RTO Timer
An abbreviation for "Retentive Timer On," a type of timer in PLC programming that retains its value even after the control power is lost.
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