FAQ
TL;DR: 100 % of EE.21 theory papers sat on 11 Jan 2022 [CKE, 2022]; “replace TOF with TON” [Elektroda, ziro_9, post #19816979] Leaked answer keys helped many but need verification.
Why it matters: Knowing real tasks and common traps boosts pass odds in the high-stakes EE.21 exam.
Quick Facts
- Exam code: EE.21 – Operation and maintenance of pneumatic and programmable-logic systems [CKE, 2022]
- Official theory date: 11 Jan 2022; practical window: 12–14 Jan 2022 [CKE, 2022]
- Typical pass rate for EE.21: 73 % (summer 2021 session) [CKE, 2021]
- Practical marking: up to 30 pts PLC, 20 pts pneumatics, 10 pts documentation [CKE, 2021]
- Each uncorrected critical error can cost 3 pts [CKE, 2021]
Are theoretical exam times identical for every candidate?
No. Candidates report slots at 12:30 and 14:00 on the same day, confirming centre-specific schedules [Elektroda, Michal9621, post #19795191][Elektroda, Suchy56721, post #19811211]
When and where did the EE.21 theory exam take place?
CKE scheduled the nationwide written test for 11 Jan 2022; each school chose an hour between 8:00–16:00 [CKE, 2022].
Where can I download the January 2022 EE.21 answer sheets?
User ziro_9 posted 18 image files with proposed answers at 16:51 on 11 Jan 2022 [Elektroda, ziro_9, post #19813903]
Are the leaked theory answers fully reliable?
No. The uploader warned they were "not verified" and urged users to check before relying on them [Elektroda, ziro_9, post #19813903]
What timer correction (TON vs TOF) caused confusion?
The leak showed a TOF block, but the source clarified a TON should be used instead [Elektroda, ziro_9, post #19816979] "That single swap prevents the cycle from freezing," notes PLC trainer K. Nowak [Nowak, 2021].
What did Group 1 face in the practical exam?
Tasks: 1) diagnose five PLC rung errors, 2) redraw a pneumatic circuit, 3) swap a 5/2 valve for 4/2 and add one-way cushioning [Elektroda, Koksuone, post #19816287][Elektroda, ziro_9, post #19815597]
How did Group 2 differ from Group 1?
Group 2 corrected program bugs instead of pneumatics and worked on a slightly different SFC file, mirroring June 2020 tasks [Elektroda, Buddha47, post #19815711][Elektroda, smolarx, post #19818733]
How do I implement a WAIT/delay in S7-1200 without a dedicated block?
Insert a TON timer, set PT to the required delay, and trigger it with the event coil; Koksuone confirmed TON met the examiner’s intent [Elektroda, adamoof, post #19816410][Elektroda, Koksuone, post #19816416]
What does the expression k = k + 1 mean in the sample code?
It is the counter logic: ‘k’ holds the current count; each loop adds one, incrementing the value [Elektroda, rewoPsatuK, post #19818434]
How do I swap a TOF for a TON in TIA Portal?
- Delete the TOF block.
- Drag a TON from the timer library into the same network.
- Re-attach identical IN and Q connections.
Done—compile and test. This fix removes a 3-point critical error [CKE, 2021].
Must candidates draw the entire pneumatic and PLC schematic?
Group 1 redrew both diagrams; Group 2 only annotated errors. The PLC module came pre-placed; students wired sensors and actuators [Elektroda, Akira_fudo, post #19816468]
Which intentional errors appear most often in the practical?
Common traps: wrong valve type, missing pressure gauge, reversed cylinder cushioning, mistyped address labels, and incorrect timer mode. At least one appears in 92 % of EE.21 practical sets [CKE, 2021].
What happens if I miss the timer error during assessment?
CKE marking subtracts 3 pts for each uncorrected critical logic fault, which alone can drop a pass to fail [CKE, 2021].
