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Mission 24 · Pro SFC alternative branch exercise

Choose the right route

Pick route A or B, then stick with it.

When Start is pressed, take route A (ValveCmd) if the RouteA switch is ON. Otherwise take route B (DrainValve). Keep that route until Stop. Stop closes both routes and moves to Complete with Done ON.

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

RouteA ON opens only ValveCmd; Stop completes

Test 1 of 3
Set by the testChecked by the testStep 2 of 2 · 80 ms
Level
Advanced
Time
About 18 min
Reward
+300 XP
Rig
3D process tank
Siemens editors
GRAPH
Rockwell editors
SFC
Course stage
13. Choose a route
Automatic tests

What the tests check

  1. Before Start, ValveCmd, DrainValve and Done are all OFF.
  2. Route A turns on only ValveCmd. Route B turns on only DrainValve. Changing RouteA mid-run does not change the route.
  3. Stop turns ValveCmd and DrainValve OFF and turns Done ON in Complete.
  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

An operator chooses which line will receive a batch from a mixing tank. The choice should stay fixed while that batch moves.

Changing the outlet halfway through can send product to the wrong place. Opening both routes at once can split one batch in two.

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.

Keep going

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