Deadman switches are used in conjunction with other safety devices to supply servo power.

• A. True
• B. False
• C. Only for manual control
• D. Not used with servo power

Answer: (A)

Deadman switches act as an operator presence signal in a safety circuit. They require the operator to continuously hold the switch to keep the control path active, which in turn enables the servo power. In robotics safety, enabling servo power isn’t done by a single device alone; it’s part of a safety-rated chain that includes other safeguards such as emergency stops, safety interlocks, and protective sensing devices. When the operator releases the switch or any part of the safety chain trips, servo power is cut immediately, preventing unexpected or unsafe motion. This collaborative use with other safety devices is why the statement is correct: the deadman switch is used in conjunction with other safety devices to supply servo power.