FPABS Cheat Sheet 2026: One-Page Review of Must-Know Facts

What This One-Page Sheet Covers (and What It Doesn't)

This cheat sheet condenses the fourteen preparation topics Festo publishes for its Fundamentals of PLC curriculum into a fast-review format. It is built for the final stretch before your exam, when you need to confirm that the core facts are sitting in memory rather than learn them from scratch. If you are earlier in your preparation, start with the FPABS study guide and come back to this page for consolidation.

A few honest boundaries. Festo's published topic list is a preparation curriculum, not a verified formal exam blueprint, and no official percentage weights were verified. This sheet therefore treats all fourteen topics as equally worth reviewing. It also contains no leaked questions and no model-specific exam requirements, because none are documented. For the full topic-by-topic breakdown, see the FPABS exam domains guide.

Identity, Format and Passing Score at a Glance

Get the credential's identity straight first, because several unrelated certifications share similar abbreviations. The facts below apply to this credential only.

Two traps to avoid. First, the 6 units, 5 labs and 1 project describe training components, not an exam timer or a requirement to take both platform exams. Second, a 70% passing threshold is not a pass rate. The threshold tells you the cut score; it says nothing about how many candidates pass. We cover that distinction in detail in the FPABS passing score article and the FPABS pass rate analysis.

Hardware Block: Relays, PLC Sections, I/O and Memory

The first cluster of topics is the physical and architectural foundation. These are typically the most approachable items, so make sure you never lose points here.

Scan Cycle and Addressing Facts

Logic processing, covered by the topic on addressing and scanning, is where many candidates move from memorizing definitions to reasoning. The scan is a repeating sequence, and questions often ask what happens at a given moment.

1. Read inputs: the processor captures the state of the input devices into an input image.
2. Execute the program: logic is evaluated rung by rung against that image.
3. Update outputs: results are written to the output devices.
4. Housekeeping and communications: the controller services other tasks, then repeats.

Addressing is the other half. Every input, output and internal storage location is identified by an address, and the notation differs between platforms. Use manufacturer-labelled examples when you practice: Allen Bradley tags and addresses look different from Siemens symbolic and absolute addresses, and mixing the two in your head is a common source of confusion. Our difficulty guide explains why this kind of platform-specific reasoning is where preparation pays off.

Number Systems and Boolean Quick Reference

Numbering systems (decimal, binary, octal, hexadecimal and ASCII) reward drilling. The skills are mechanical, so practice until conversions are automatic.

Build your own practice set: convert a few decimal values to binary, then regroup the bits into octal and hex to confirm you land on the same number. Always verify by converting back.

Ladder Logic and Programming Techniques

Programming techniques build directly on the Boolean block. Expect to read a short ladder rung and predict the output, or choose the rung that implements a stated behavior.

• Series contacts implement AND; parallel branches implement OR.
• Seal-in (latching) circuits use an output's own contact in parallel with the start input to hold the output on until a stop condition breaks the rung.
• Stop logic is typically wired so a broken wire fails safe: think about why a normally closed stop device is preferred.
• Output coils should generally be driven from one rung, because duplicate coil use creates confusing results.

Write original practice rungs on paper for both platforms, keeping each labelled with its manufacturer so you build separate muscle memory. If you want a place to test yourself, the FPABS practice test site offers question practice aligned with these topics.

HMI, Protocols and Networks

Three topics cluster here: HMI integration, communication protocols and networks. They are conceptual rather than computational, which makes them easy to skim and easy to underestimate.

Because the specific protocols differ by platform, rely on the manufacturer-labelled material in your course for names and details rather than guessing. This is one place where the Allen Bradley and Siemens curricula diverge in their examples even though the topic headings match.

Troubleshooting With the PLC

The final topic, basic troubleshooting, treats the PLC as a diagnostic tool. The key idea is that the controller can show you the state of inputs and outputs, so you can separate a field problem from a logic problem.

1. Observe the symptom: what should happen, and what actually happens?
2. Check the input: does the PLC see the device change state? If not, suspect the device, wiring or power.
3. Check the logic: does the rung evaluate true when conditions are met? If not, suspect the program or addressing.
4. Check the output: does the PLC energize the output? If it does and the load does not respond, suspect the output wiring or the load itself.

Allen Bradley vs. Siemens: Keep the Records Separate

Festo publishes two separate preparation documents with the same fourteen headings: one for Allen Bradley (document 272391) and one for Siemens (document 272390). Both are dated EN 2025.09. The shared topics mean the concepts transfer, but the examination records and manufacturer-labelled examples are separate.

Do not treat these as one combined 100-question exam; the Virginia listings describe platform-specific records. If your institution only offers one branch, prepare only for that branch. Also be careful with pass-rate claims: a small historical study of external learners who took the Siemens exam after early-2021 training reported that all 18 passed, but that was a self-selected cohort, not an issuer-wide, current or Allen Bradley pass rate.

Cost, Eligibility and Registration Mechanics

Registration happens through participating institutions rather than as a standalone consumer purchase. The documented student requirements are training by an actively NC3-certified instructor using required equipment, completion of all hands-on labs, and an exam score of at least 70%. Proctoring and open-book or closed-book allowances are set by the school and the specific exam, so check with your instructor rather than assuming rules from any other source. More detail is in the FPABS requirements article and the exam dates and scheduling guide.

On cost, NC3's student certification charge is US$0, and Virginia's records likewise list no cost per test. That does not mean the whole pathway is free. Training tuition and institutional charges are separate. As one example, Virginia Western's bundled PLC and Sensors course (Allen Bradley branch only) lists estimated tuition of US$999 including online resources, lab equipment, software and the credentialing exam, with a local Electricity prerequisite. Note that the college's own pages disagree on course length (eight weeks versus four), and neither figure is an exam timer. That tuition is not a Siemens exam fee, and the prerequisite is not universal Festo eligibility. See the certification cost breakdown for the full picture.

A Domain-Ordered Review Plan

Since the topics are unweighted, a sequence that follows dependencies works better than one that follows guesses about emphasis. Build the foundation first, then logic, then systems.

Adjust the pacing to your course calendar, and remember that your instructor's lab schedule drives what you can practice hands-on. For background on what the credential is and how it is described, see what FPABS certification is, and for pathways after passing, the FPABS jobs overview.

Frequently Asked Questions