What you learn today
- Filtration unit and filters
- On and Mode
- Check the filter in its slot
The base's exhaust pipe carries everything jumbled together: nitrogen, oxygen, CO₂, a little water vapour. If you want to recover single gases from it you need the filtration unit (StructureFiltration).
One inlet, two outlets
| Connection | Content |
|---|---|
| Inlet | the mixture |
| Outlet | the filtered-out gas |
| Waste | everything that is left |
Which gases get filtered out is decided by the two gas filters in slot 0 and slot 1 – a CO₂ filter catches CO₂, a nitrogen filter nitrogen. Slot 2 takes a chip of its own; you do not need it here.
On and Mode
The unit only filters when both are right: On = 1 and Mode = FiltrationMode.Active (1). Mode 0 means Idle – the unit is on but does nothing.
sbn FILTRATION HASH("Luftfilter") On 1
sbn FILTRATION HASH("Luftfilter") Mode 1Checking the filter in its slot
Every filter wears out. Its condition is the slot's Quantity, from 100 (new) to 0 (used up). With lbns you read a slot by the device name:
lbns q0 FILTRATION HASH("Luftfilter") 0 Quantity Average
lbns q1 FILTRATION HASH("Luftfilter") 1 Quantity AverageA filter only loses quantity when it really catches gas: a small filter one point per 145 ticks of work, a medium one (…M) per 721 and a large one (…L) per 2881 ticks. A CO₂ filter in CO₂-free air therefore lasts forever. Which gas a filter catches is shown by FilterType in the slot (the number from GasType., CO₂ = 4).
Empty filters are simply skipped. If both are empty, the unit pushes the whole mixture unfiltered into the waste outlet – using power, without any error. So check Quantity, not just whether the unit is running.
An empty slot returns Quantity 0, just like a used-up filter. One comparison is therefore enough for the “change filter” warning.
Exercise
Task
The filtration unit “Luftfilter” has two filters in slots 0 and 1.
- Unit on and
Mode1 while at least one filter still has quantity, otherwise both 0 - Flashing light “Filterwechsel” on when one of the filters is below 10 or the unit is missing
- Display “Filter” shows the weaker of the two filters, −1 without the unit
Hints
Hint 1
At least one usable filter: max tmp q0 q1, then sgtz active tmp.
Hint 2
Write active twice: to On and to Mode.
Hint 3
For the warning take the weaker filter: min tmp q0 q1, slt warn tmp CHANGE – and “or” in the missing unit.
Quiz
4 questions. You pass from 60 % – the server does the grading.
Complete the day
- Passed the simulator exercise
- Passed the quiz with at least 60 %
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