Motor 01 — Three ways to stop

Briefing

STOP is not the only way a motor stops. The emergency stop (ESTOP) and the thermal overload relay (THERMAL_OL) must stop it too. Both read TRUE when active. When either clears, the motor must stay off. Only a new START may run it again, and START must be ignored while either is still active. RUN_LAMP shows when the motor is on.

Objectives

• START runs MOTOR and RUN_LAMP; they stay on after you release START
• STOP_PB, ESTOP or THERMAL_OL each stop MOTOR and RUN_LAMP
• After ESTOP or THERMAL_OL clears, MOTOR stays off until START is pressed again
• START does nothing while ESTOP or THERMAL_OL is active

I/O Table

Your program will be tested against:

All test cases run automatically when you submit. Assertions are hidden until you pass.

1. #1START → MOTOR and RUN_LAMP on

   A START pulse runs the motor and the lamp, and they hold after release

2. #2STOP → MOTOR and RUN_LAMP off

   A STOP pulse after START switches both outputs off

3. #3ESTOP stops the motor, and it stays off after ESTOP clears

   The motor does not restart by itself when the emergency stop is released

4. #4THERMAL_OL stops the motor, and it stays off after the overload clears

   The motor does not restart by itself when the overload relay clears

5. #5START does nothing while ESTOP is active

   With ESTOP held, START cannot run the motor; once ESTOP clears, START works again

6. #6START does nothing while THERMAL_OL is active

   With the overload tripped, START cannot run the motor; once it clears, START works again