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Mission 42 · Pro PLC programming exercise

Keep the workshop in air

Run a compressor between two pressures.

Put the station in service with Start, then run the compressor to hold the receiver between 6.0 and 8.0 bar.

This mission is part of ProTry the full course, every mission and the expert challenges free for 7 days. No card needed.
The 3D air compressor station this mission runs on Pro mission
Test replay

Charges through the band and rests

Test 1 of 4
Set by the testChecked by the testStep 5 of 5 · 180 ms
Level
Applied
Time
About 15 min
Reward
+250 XP
Rig
3D air compressor station
Siemens editors
SCL, LAD
Rockwell editors
Structured Text, Ladder
Course stage
26. Machine lab 1: real machines, clear rules
Automatic tests

What the tests check

  1. Start puts the station in service; Stop takes it out of service, and wins.
  2. Out of service, CompressorRun is always OFF.
  3. In service, the compressor starts below 6.0 bar and stops at 8.0 bar or above.
  4. Between 6.0 and 8.0 bar the compressor keeps its previous state.
  5. ReadyLamp shows the station is in service.
  1. Try it Use the buttons below the model and watch the rig respond.
  2. Test solution Every check runs on your code in one press.
  3. Replay If one fails, step through it one scan at a time to see why.
Why it matters

Where you’d see this on site

A body shop's compressor cuts in when spray guns and wrenches pull the receiver down, and rests once it is charged.

A compressor that starts and stops every few seconds overheats its motor and wears out its contactor within months.

Where you'd find thisKeep compressed air ready without running the motor all day

Almost every workshop and factory has a compressor like this in a back room. It feeds air tools, spray guns and the pneumatic cylinders on machines. The PLC starts the motor when the pressure falls to a lower limit and stops it at an upper limit, so the motor rests between charges.

  1. Air intakeFiltered room air
  2. CompressorSqueezes the air
  3. ReceiverStores it under pressureYou are here
  4. WorkshopAir tools and machines
On a real site: places, parts and safety
  • Vehicle workshops and body shops
  • Packaging and assembly lines with pneumatic cylinders
  • Joinery shops and small factories

Isolate and vent the receiver before working on the pipework: stored air is stored energy.

Never adjust or block a safety valve to stop it lifting.

The sizes, timings and cutaways are teaching choices, not a drawing of any one real installation.

Keep going

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