Analog 00 — Raw reading to percent

Briefing

A level transmitter gives LEVEL_RAW, a whole number from 0 (empty) to 32767 (full). The panel needs LEVEL_PCT, 0 to 100. A result within 1 of the true value is accepted. Whole-number maths throws away the fraction, so the order matters: a small number divided by 32767 is 0. SCALED is a larger (DINT) variable for the in-between result. Maths is written in the Code tab, one assignment per line, with the function names ADD, SUB, MUL and DIV. For example, TOTAL := ADD(A, B); stores A plus B in TOTAL.

Objectives

• Raw 0 gives 0 percent
• Raw 8192 gives about 25 and 16384 about 50
• Raw 32767 gives 100
• A small raw reading such as 1000 gives about 3, not 0

I/O Table

Your program will be tested against:

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

1. #1Raw 0 → 0 percent

   An empty tank reads 0 percent

2. #2Raw 8192 → about 25 percent

   A quarter of the raw range is a quarter of the scale

3. #3Raw 16384 → about 50 percent

   Half of the raw range is half of the scale

4. #4Raw 32767 → 100 percent

   The top of the raw range is the top of the scale

5. #5Raw 1000 → about 3 percent

   A small reading must not collapse to zero