Which of the following is NOT a component of the SOP?

The end effector is the component that interacts with the environment or performs the task in robotic systems, such as a gripper or tool. In the context of Standard Operating Procedures (SOPs) for FANUC systems, the focus is typically on components that are essential for control, monitoring, and operation of the system rather than the specific tools that carry out tasks. The other components mentioned, such as LEDs and switches, are integral to the operational status and user interaction with the system, thus playing a key role in following the SOP. The fault LED provides error status, the power LED indicates the operational condition, and the mode switch allows users to change operational modes, making them vital for guidance during operation. In contrast, the end effector, while critical for task execution, does not fall under the category of components that strictly constitute the SOP.