Beginner 08 — Delayed-on light (TON)

Briefing

An on-delay timer: after SWITCH closes, wait 2 seconds, then turn LIGHT on. Release the switch early and the timer resets — the LIGHT never comes on. A TON ("Timer On-Delay") is a function block. You declare an instance in VAR, call it with an enable input and a preset time in milliseconds, then read its .Q output bit on a rung.

Objectives

• Hold SWITCH on for less than 2 seconds → LIGHT stays off
• Hold SWITCH on for at least 2 seconds → LIGHT turns on

I/O Table

Your program will be tested against:

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

1. #1Hold SWITCH 2200 ms → LIGHT on

   Once the 2 s preset elapses, TON.Q goes true

2. #2Hold SWITCH 500 ms → LIGHT stays off

   Timer has not yet reached its 2 s preset

3. #3Release SWITCH early → LIGHT stays off

   Dropping IN before PT elapses resets the timer