Which power cycling method allows installation of options and updates to the controller?

• A. Cold Start
• B. Soft Start
• C. Power-on Reset
• D. Controlled Start Method

Answer: (D)

Installing options and updates requires a deliberate startup sequence that puts the controller into a known maintenance state before changes are applied. The Controlled Start Method provides that defined path: it starts the controller in a controlled, non-running condition, allowing new hardware options or firmware to be detected, initialized, and written safely without active processes interfering. This sequencing ensures the configuration memory and option modules are properly read and configured, and it minimizes the risk of corruption or incomplete updates when changes are applied.

In contrast, a cold start is simply powering the system from full shutdown, which may be used for a clean boot but doesn’t guarantee a maintenance-ready state. A soft start mainly manages inrush and ramping of power while keeping the system largely in its previous state. A power-on reset resets the device on power-up but does not provide the explicit maintenance workflow needed for installing options and updates.