Fault 04 — Stuck Input

Briefing

A tank filling system never fills. The pump never turns on. A quick visual check of the empty tank suggests the sensor should be reporting "not full" — but the pump still won't start. Use the I/O panel and Variables tab to diagnose.

Objectives

• Observe the LEVEL_SENSOR reading in the I/O panel / Variables tab
• Use a force override to temporarily clear the sensor input
• Confirm the pump runs when the sensor is forced off
• Correctly identify the fault as a stuck physical sensor

I/O Table

Your program will be tested against:

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

1. #1Pump runs when sensor is not active

   LEVEL_SENSOR false → FILL_PUMP ON

2. #2Pump stops when tank is full

   LEVEL_SENSOR true → FILL_PUMP OFF, FULL_LAMP ON