- What the Certification Actually Is
- Two Exams, One Credential: CLED-1 and CLED-2
- Who Can Sit for It
- The Nine CLED-1 Topic Areas
- What the CLED-2 Practical Involves
- Booking, Fees, and Proctoring
- Who Values This Credential
- Sequencing Your Preparation by Domain
- Validity and Renewal
- Frequently Asked Questions
- CLED means Certified LabVIEW Embedded Systems Developer, issued by National Instruments (NI).
- Certification requires passing both CLED-1 (30 multiple-choice questions, one hour) and CLED-2 (five-hour practical); CLED-1 alone confers nothing.
- You need active CLD or CLA status before attempting CLED-1; CLED-2 additionally requires a CLED-1 pass.
- CLED-1 covers nine unweighted topics, including LabVIEW Real-Time, NI Scan Engine, LabVIEW FPGA, and Reliability.
What the Certification Actually Is
The Certified LabVIEW Embedded Systems Developer credential, abbreviated CLED, is National Instruments' professional certification for engineers who build deterministic, reliable embedded control and monitoring systems with LabVIEW. It sits above the Certified LabVIEW Developer (CLD) and Certified LabVIEW Architect (CLA) credentials in a very specific way: it is not a replacement for either, but a specialization that assumes you already hold one of them.
Where the CLD and CLA focus on general application design and architecture on desktop and real-time targets, the CLED zeroes in on a narrower and more demanding territory. It tests whether you can deliver working systems on NI's embedded hardware families: CompactRIO, Single-Board RIO, and R Series devices. The core technologies are LabVIEW, LabVIEW Real-Time, and LabVIEW FPGA. If your daily work involves thread priorities, FPGA resource budgets, watchdogs, and system images, this is the credential built around your job.
A note on terminology: "CLED" is also used elsewhere in the industry for unrelated credentials. Everything on this page refers exclusively to the NI certification. For quick-reference definitions, see our short explainers on what CLED stands for and the meaning of CLED.
Two Exams, One Credential: CLED-1 and CLED-2
The most common misunderstanding about this certification is treating it as a single test. It is a two-stage process, and the stages are very different in character.
| Attribute | CLED-1 | CLED-2 |
|---|---|---|
| Format | Multiple choice | Hands-on application development |
| Length | 30 questions in one hour | Five hours |
| Passing mark | 70% | 70% |
| Prerequisite | Active CLD or CLA status | Active CLD or CLA status plus a CLED-1 pass |
| Hardware | None; knowledge-based | Single-Board RIO |
| Proctoring | Proctored | Proctored, onsite at NI facilities or an arranged location |
| Certificate awarded | No, not on its own | Yes, once both parts are passed |
CLED-1 is the written gate. It checks that you hold the conceptual knowledge of real-time scheduling, FPGA design, communication patterns, and reliability engineering that the practical assumes. CLED-2 then asks you to apply that knowledge by building an application against a specification in a fixed window.
This site's primary focus is CLED-1, the multiple-choice examination, with a separate preparation track for the CLED-2 hardware-development assessment. Practice questions can sharpen your recall for the written part, but they cannot substitute for hands-on hours with embedded hardware, and the five-hour practical should never be mistaken for a longer written test. You can start with the CLED practice tests on the main site to gauge where your written-exam knowledge stands.
Who Can Sit for It
Entry is gated by existing NI credentials, not by a course attendance record. To attempt CLED-1, you must hold active Certified LabVIEW Developer (CLD) or Certified LabVIEW Architect (CLA) status. To attempt CLED-2, you additionally need a passing CLED-1 result. The ordering is enforced: the written part comes first.
Beyond the formal gate, NI recommends substantial practical experience: roughly 18 to 24 months developing medium-to-large LabVIEW control and monitoring applications using CompactRIO, Single-Board RIO, or R Series hardware. NI also acknowledges an alternative path of mastery of the relevant embedded-control training. In plain terms, the credential assumes you have already shipped real systems, watched them misbehave in the field, and fixed them.
If you are unsure whether your background lines up, our CLED requirements guide walks through eligibility and prerequisites in more detail.
The Nine CLED-1 Topic Areas
The official CLED preparation guide lists nine topics for the multiple-choice part. NI does not publish percentage weightings for them, so you should treat all nine as fair game and resist the urge to skip any. For a deeper treatment of each area, see the complete guide to all nine CLED content areas. The summary below highlights what each one demands.
Domain 1: LabVIEW Real-Time
The conceptual heart of the exam. You must reason about how threads and priorities interact, not just recite definitions.
- Thread priorities, execution systems, and how they relate to one another
- Priority inversion, shared resources, and starvation
- VI priority versus timed loop priority, and OS thread priority
- Analyzing application requirements to choose priorities
- Error handling and logging, plus multi-core programming
Domain 2: NI Scan Engine
Choosing the right I/O access strategy for the job and understanding its timing consequences.
- Selecting between NI Scan Engine, Hybrid Mode, and LabVIEW FPGA Mode
- Scan engine timing considerations
- Handling scan engine faults
Domain 3: LabVIEW FPGA
Expect questions on both correctness and resource efficiency on the fabric.
- Emulation mode, arbitration, and enable chains
- Buffering techniques for DMA FIFOs
- Fixed-point data types for FPGA operations
- Optimizing for space versus performance, including throughput and the single-cycle timed loop
- Reading the compile report
Domain 4: Data Communication
Picking the right transport and pattern for each data flow.
- Commands, tags, and streaming as distinct communication styles
- Best practices for tags, network streams, command/message schemes, and FPGA interprocess communication
- TCP and UDP, UDP multicast and broadcast, and client-server designs
Domain 5: Hardware Synchronization
Keeping distributed and multi-device systems on a common timebase.
- FPGA synchronization via a shared backplane bus
- Clock synchronization for distributed systems
- Synchronization bottlenecks
- IEEE 1588, NI Time Sync, and SNTP-style time protocols
Domain 6: Reliability
The broadest topic area and, in practice, the one that trips up candidates who have only built prototypes.
- Failure modes and failure states, redundancy, error logging, and alarming
- The LabVIEW Real-Time watchdog and the LabVIEW FPGA watchdog (Fail Safe Control Architecture)
- Acknowledgement-based reliable communication and system health monitoring
- Memory: allocation types, which components allocate it, fragmentation, buffer allocation effects, behavior when memory runs out, and strategies for fixed-size data
Domain 7: Test, benchmark and debug applications
Measuring a system rather than guessing about it.
- Testing functional requirements and benchmarking uptime, throughput, and data rates
- Using the LabVIEW Real-Time Execution Trace Toolkit for threads, VI execution, memory, and contention
- Benchmarking CPU usage, latency, jitter, and FPGA usage
- Preparing a system for benchmarking and extracting data from headless systems via console and syslog
Domain 8: Deployment
Getting working software onto many targets repeatably.
- Creating a system image for replication and using system configuration tools
- Building an executable and setting it as the startup application
- Deploying Scan Engine and shared variable settings, software and runtime updates, and updates applied on reboot
- Deploying and replicating touch panels
Domain 9: Integration with other LabVIEW Modules
A compact topic area centered on the LabVIEW Datalogging and Supervisory Control (DSC) Module: logging and displaying alarm, event, and historical trend data.
Key Takeaway
The nine areas are unweighted, so depth matters more than guessing at emphasis. Reliability alone contains a long list of memory-related objectives, so budget extra time there while still covering the smaller areas such as Scan Engine and DSC integration.
What the CLED-2 Practical Involves
CLED-2 is a five-hour, proctored application-development assessment built around Single-Board RIO hardware. You are given requirements and expected to produce a working embedded application, applying the real-time, FPGA, communication, and reliability principles that CLED-1 tests on paper. A 70% score is required to pass.
Two points deserve emphasis. First, the practical is graded against its own rubric, which is distinct from the written-topic list above; do not assume the nine CLED-1 topics map onto grading categories for CLED-2. Second, it is administered onsite at NI facilities or at an arranged location, so logistics are very different from the written exam. Plan around travel or coordination with NI well in advance.
Because the practical rewards fluency, the best preparation is time at the keyboard with real hardware: building a real-time host with a clean architecture, wiring an FPGA personality with DMA FIFOs, and handling faults gracefully. Our difficulty breakdown discusses where candidates typically feel the pressure.
Booking, Fees, and Proctoring
Both parts are proctored. For scheduling, rely on NI's current booking instructions rather than older materials. Some legacy badge pages and preparation documents still reference a previous test-delivery vendor and older browser or proctoring steps; where those conflict with NI's current instructions, treat them as historical and follow the current guidance published on NI's certification pages, including its documentation on online exams.
NI's current catalog and delivery guidance for 2026 retain the CLED program and name CLED-1 among the multiple-choice examinations. Fee amounts can change, so confirm the current price at booking time rather than relying on a figure you saw in a forum post. For a structured look at what to budget, including retakes and travel for the practical, see the CLED certification cost breakdown, and check exam dates and scheduling for planning your timeline.
Who Values This Credential
The CLED is a niche credential, and its audience is correspondingly specific. It carries weight where deterministic, long-running embedded systems are the product or the infrastructure:
- NI Alliance Partners and system integrators that deliver custom CompactRIO and Single-Board RIO solutions to clients and want a verifiable signal of embedded competence.
- Test and measurement organizations building in-house control and monitoring platforms on NI embedded hardware.
- Industrial automation and machine-control teams that need real-time determinism, safe failure states, and remote deployment at scale.
- Research labs and advanced engineering groups running high-speed, FPGA-based acquisition and control experiments.
Job postings rarely demand the CLED outright; more often it works as a differentiator among candidates who already hold CLD or CLA status, or as evidence for a promotion into a technical-lead role. For a closer look at market demand, read about CLED jobs, weigh pay expectations in the salary analysis, and judge the payoff using the ROI discussion.
Sequencing Your Preparation by Domain
Generic study habits matter far less here than the order in which you tackle the topics, because several CLED-1 areas build on one another. A sensible sequence for the written exam follows.
LabVIEW Real-Time and NI Scan Engine
- Master priorities, execution systems, and priority inversion first; later reliability and benchmarking questions assume this vocabulary
- Work through Scan Engine versus Hybrid versus FPGA Mode trade-offs
LabVIEW FPGA and Data Communication
- Practice reading compile reports and reasoning about DMA FIFO buffering
- Compare network streams, tags, and message patterns against concrete use cases
Reliability and Hardware Synchronization
- Give Reliability the longest block, especially memory fragmentation and out-of-memory behavior
- Cover watchdogs on both the real-time and FPGA sides
Benchmarking, Deployment, DSC, and Review
- Revisit the Execution Trace Toolkit and system image workflows
- Finish with timed practice runs matching the 30-question, one-hour format
The timed format is tight: 30 questions in 60 minutes leaves about two minutes per question, so speed on scenario-style items matters. Pair the official LabVIEW for CompactRIO Developer's Guide and the CLED sample materials with practice questions, and keep a condensed reference handy, such as our one-page cheat sheet. For a fuller plan, see the complete CLED study guide, and when you want to test yourself under realistic timing, use the practice exams. If you want to understand how the 70% threshold works, read about the passing score.
Validity and Renewal
Once earned, the certification is valid for five years. To maintain it, you can renew by retaking the CLED exam or by completing approved recertification-by-points activities under NI's recertification policy. Because the credential depends on holding CLD or CLA status at the time of the attempt, keep those underlying certifications current as well, so a lapse in one does not complicate your path for the other. Check NI's recertification policy page for the current list of qualifying activities and the points required.
Frequently Asked Questions
CLED stands for Certified LabVIEW Embedded Systems Developer, a professional credential issued by National Instruments for engineers who build embedded control and monitoring systems with LabVIEW Real-Time and LabVIEW FPGA on NI hardware.
No. CLED-1 is a prerequisite multiple-choice exam, and no certificate is awarded for it alone. You must also pass the five-hour CLED-2 practical to earn the Certified LabVIEW Embedded Systems Developer credential.
You need active Certified LabVIEW Developer (CLD) or Certified LabVIEW Architect (CLA) status to attempt CLED-1. CLED-2 additionally requires a passing CLED-1 result. NI also recommends 18 to 24 months of embedded LabVIEW development experience.
CLED-1 has 30 multiple-choice questions in one hour, and CLED-2 is a five-hour application-development practical. Both require 70% to pass, and both are proctored.
It is valid for five years. You can renew by taking the CLED exam again or through approved recertification-by-points activities described in NI's recertification policy. For a fuller overview, see our page on what CLED certification is, or read the pass rate discussion for context on how candidates fare.