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Mission 23 · Pro SFC and GRAPH sequence exercise

One batch, four phases

Fill. Mix. Drain. Complete.

Build a sequence that runs one batch: Ready, Fill, Mix, Drain, then Complete. Each phase is a step, a box in the chart. Each piece of equipment runs only in the step that needs it.

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The 3D process tank this mission runs on Pro mission
Test replay

Runs one batch: fill, mix, drain, complete

Test 1 of 3
Set by the testChecked by the testStep 4 of 4 · 160 ms
Level
Advanced
Time
About 18 min
Reward
+300 XP
Rig
3D process tank
Siemens editors
GRAPH
Rockwell editors
SFC
Course stage
12. One batch, clear phases
Automatic tests

What the tests check

  1. In Ready, PumpOn, FillValve, MixerOn, DrainValve and Done are all OFF. Start AND Permit moves to Fill.
  2. Fill turns on PumpOn and FillValve. Level >= 70 moves to Mix.
  3. Mix turns on MixerOn. MixDone moves to Drain.
  4. Drain turns on DrainValve. Level <= 5 moves to Complete, which turns Done ON.
  5. Only the listed for the current phase are ON. All the other equipment is OFF.
  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 drinks mixer fills with ingredients, mixes them, then empties into a holding tank. Each batch must go through those steps in order.

Draining before mixing can send unfinished drink to the next tank. An inlet left open can spill liquid during a later step.

Where you'd find thisMaking one batch of drink

At a drinks factory, valves let measured amounts of water and syrup into a mixing tank. An electric mixer blends them into one batch. An outlet valve then sends the drink to a holding tank. Filling machines bottle it from there.

  1. Ingredient tanksHold the water and syrup
  2. Mixing tankFill, mix and measure one batchYou are here
  3. Holding tankKeeps the finished drink ready
  4. Bottle fillerPuts the drink into bottles
On a real site: places, parts and safety
  • Drinks factory — blending water and syrup
  • Paint factory — mixing ingredients into a consistent colour
  • Water-treatment works — preparing a measured chemical mixture
  • Brewery — heating water for washing equipment

A full tank does not close its own inlet. Water keeps arriving until the valve closes, so an open inlet can flood the room.

A heater that is not covered by liquid can overheat. Real tanks have separate safety devices as well as the PLC programme.

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

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