What happens after a B1 obstruction is detected and the gate reverses?

• A. Gate continues moving until commanded again
• B. Gate remains stopped until obstruction cleared
• C. Gate stops and rests; if obstruction clears, returns to normal; a Type D device may move the gate
• D. Gate immediately opens fully

Answer: (C)

When a B1 obstruction is detected, the safety system treats it as a blocker and the gate reverses to back away from the obstacle. After reversing, the gate stops and rests in place; it will not move further toward its travel position while the obstruction remains. If the obstruction is cleared, normal operation can resume, returning to the commanded movement. In some systems, a Type D device is allowed to move the gate again after clearance to complete the requested travel.