Two-hand control and presence sensing are protective measures. Which statement is true?

• A. Two-hand control requires both hands to initiate a safe cycle, preventing starts when hands are near; presence sensing detects human presence.
• B. Two-hand control is optional; presence sensing is used only for HVAC.
• C. They are software-only features with no hardware requirement.
• D. They are methods to increase robot speed.

Answer: (A)

The main idea is to protect workers by making sure the robot won’t start or continue moving if a person could be in danger, using physical safeguards and sensing systems.

Two-hand control is a start mechanism that requires the operator to engage and maintain two separate hand controls to begin and/or sustain a cycle. This setup forces the operator’s hands to stay in safe positions, away from the robot’s moving parts, because the cycle won’t start or will stop if a hand leaves the controls or if the safety condition isn’t met. Presence sensing uses sensors such as light curtains, mats, or vision systems to detect a person in or approaching the robot’s workspace. If a person is detected, the system stops or prevents movement to keep the area safe.

These are hardware-based safety features that rely on physical interlocks and sensors, not software-only functions, and they aren’t about HVAC or increasing speed. So the statement that correctly describes both measures is the one that emphasizes both hands are needed to initiate a safe cycle and that presence sensing detects human presence.