Challenges
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PLC programming challenges
Challenge 03 · Code it · Free

Pump down between two floats

Start at the high float, stop below the low float.

Rainwater runs into the sump. Start Pump1 when the water reaches the high float (FloatHigh ON). Keep it running until the water falls below the low float (FloatLow OFF). Between the two floats, keep doing whatever the pump was already doing.

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The 3D duty standby sump pumping station this challenge runs on
Test replay

Pumps down from the high float to the low float

Test 1 of 2
Set by the testChecked by the testStep 6 of 6 · 640 ms
Level
Easy · 10 points
Kind
Code it
Time
About 8 min
Pass rate
New
Machine
3D duty standby sump pumping station
Siemens
LAD and SCL
Rockwell
Ladder and Structured Text
Beckhoff
Structured Text
Automatic checks

What the checks test

  1. Pump1 starts when FloatHigh turns ON.
  2. Pump1 keeps running while the water falls between the floats.
  3. Pump1 stops when FloatLow turns OFF.
  4. Pump1 stays off while the sump fills between the floats.

The checks run 2 tests on the machine, scan by scan: Pumps down from the high float to the low float; Stays off while the sump fills.

On site

Where you’d find this

A car park sump collects rainwater, and a pump empties it between a high and a low float switch.

With one switch, the pump would start and stop every few seconds. The gap between the floats makes each run worth starting the motor for.

The machine

How it should behave

High float
Water above 60%: start Pump1.
Low float
Water below 20%: stop Pump1.
In between
Keep doing what the pump was doing.

Press Run and watch the sump fill. Pump1 must start at the high float and keep going to the low float. Switch HeavyRain ON for a storm.

Keep going

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