Fix 03 — Timer never times out

Briefing

The motor should start 2 seconds after START is pressed, so people near the conveyor get a moment of warning. STOP cancels a countdown that is still running and stops the motor once it runs. The program has a timer, and it is called every scan, but the motor never starts. Find out why the timer never reaches 2 seconds, and fix it.

Objectives

• After START is pressed and released, the motor stays off for about 2 seconds, then runs
• STOP during the countdown cancels the start
• STOP stops a running motor
• After a stop, the next START waits the full delay again

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 off for about 2 s, then on

   A momentary START begins a 2 second countdown, then the motor runs

2. #2STOP during the countdown → motor never starts

   Pressing STOP while the delay is running cancels the start

3. #3STOP → running motor stops

   STOP switches the motor off once it is running

4. #4Start again after a stop → waits the full delay again

   The countdown starts from zero on every start

5. #5STOP alone → motor stays off

   The motor never starts without START