Energizing a fluid-power valve solenoid in ladder logic is commonly accomplished by using which component?

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In ladder logic, energizing a fluid-power valve solenoid is done through an interface device that can switch the solenoid’s current. A relay serves this role because the ladder logic can activate the relay coil with its low-power signal, and the relay’s contacts then complete the high-current circuit that powers the valve coil. This setup provides isolation and protection for the control circuitry and allows the logic to safely control a load that may require more current than the PLC outputs can supply directly.

A sensor simply provides a signal to the logic; it doesn’t drive the solenoid. A timer can delay actions but doesn’t switch the solenoid on its own. An indicator lamp shows status and isn’t used to power the valve. So the relay is the right choice to energize the solenoid from ladder logic.