A control circuit that uses limit switches to sequence a series of events is called a(n) __________.

• A. event sequencing circuit
• B. ladder logic circuit
• C. motion control circuit
• D. sequence operator circuit

Answer: (A)

The main idea is wiring that uses each limit switch as a trigger to move the system to the next step in a predefined order. When a limit switch is activated, it signals the controller to advance to the next event, creating a coordinated sequence of actions. That hardware-driven progression is what an event sequencing circuit is designed to do: it ensures the machine performs steps in order based on the position feedback from the switches.

A ladder logic circuit is a programming method used with PLCs to implement such behavior, but the description focuses on the hardware sequencing itself rather than the software used to define it. A motion control circuit centers on controlling dynamic motion—speeds, accelerations, and precise positioning—which goes beyond simply sequencing discrete events with limit switches. A sequence operator circuit isn’t a standard term for this concept in industrial control.