Last year, during our Q1 2024 quality audit, I reviewed roughly 200 PLC programs submitted by field engineers and system integrators. You'd think after seeing that many, nothing would surprise me. But the patterns I kept finding were frustratingly predictable—and almost entirely avoidable. Programs that had no comments. Safety logic that was wired incorrectly. Rungs so tangled I had to trace them three times to understand the intent.
And every single time, when I asked about training: either "I watched a few YouTube videos" or "I worked through the manual for a weekend."
I'm not knocking self-study. I've done plenty of it myself. But there's a difference between being able to make a PLC turn a motor on and off, and understanding how to build a system that won't fail silently at 2 AM on a Saturday.
That difference? It's costly.
The Problem Most Engineers Don't See Coming
Here's what I hear from engineers all the time: "I've got the basics down, I just need to figure out a few specifics for this project." They download some sample code, skim a datasheet, and jump right into programming. And for simple standalone machines, that approach sometimes works.
But the problems don't show up during testing. They don't show up during commissioning. They show up six months later, when a sensor fails and the safety routine they cobbled together doesn't actually stop the machine in time. Or when a new operator makes a mistake, and the HMI they designed doesn't have a proper interlock. Or when the plant manager needs to change a recipe, and the entire program crashes because addressing wasn't planned for flexibility.
The most frustrating part is that these are the exact pitfalls that structured training exists to prevent. Not the basics. The patterns.
What I Actually Learned in Omron PLC Training
In my first year, I made the classic mistake: I thought PLC programming was about learning the instruction set. I memorized MOV, ADD, CMP—the usual suspects. And honestly, I got pretty far with that. I could make machines run. But I was building everything on intuition, not architecture.
Then I sat down for a proper Omron PLC training course—the kind that goes beyond just showing you CX-Programmer navigation. And what I realized was embarrassing: I'd been doing things the hard way for months.
Structured training taught me three things that fundamentally changed how I approach every project:
- How to think in tasks and programs, not just ladder rungs—especially for the NJ/NX series, where the architecture matters just as much as the logic.
- How to use structured data types properly, so I'm not maintaining 400 individual tags that could be replaced by one array.
- How to design for diagnostics, so when something breaks, the program tells you what broke and why—not just 'Error 23' with no context.
Those aren't YouTube skills. Those are classroom-and-hands-on skills.
The Real Cost of Going Informal
I've tracked the data for our department. We reviewed about 150 unique PLC programs in 2024 across our client base. The programs that came from engineers who had completed structured training (including formal Omron PLC training) had an average revision rate of 1.2. That is: mostly correct the first time, maybe one adjustment during commissioning.
The programs from engineers who were self-taught or relied on informal mentoring? Average revision rate: 4.7. I'm not exaggerating—almost five rounds of edits, rework, and on-site fixes before the system was considered reliable.
Let's put numbers to that. A standard revision cycle—review, feedback, fix, re-test—costs roughly $400 to $800 in engineering time, not counting the opportunity cost of delayed production. At 3.5 extra revisions? That's $1,400 to $2,800 of avoidable cost. Per project.
Now multiply that by 20 projects a year. Suddenly, skipping the $500 training session doesn't seem like a bargain.
I knew I should have flagged this pattern sooner, but I thought 'maybe they'll figure it out.' Well, the numbers caught up with me when I reported our audit findings to the VP of operations. That $22,000 redo from one project alone—caused by a safety interlock that was wired completely backward due to a misunderstanding of how the safety PLC handles dual-channel inputs—made it clear: informal learning has a ceiling.
The Other Hidden Problem: Maintainability
This is what keeps me up at night as a quality manager. A program that works today but is impossible to maintain is a liability.
I've inherited systems where the original programmer used data areas like general-purpose storage. No comments. No structured naming. Just absolute addresses stacked in random order. The machine worked—barely—but when a sensor failed and we needed to modify the logic, it took a senior engineer two full days to reverse-engineer the code. And we still introduced a bug that took another day to find.
That engineer said something I'll never forget: "This is what happens when someone learns programming from a 200-page PDF and never shares code with anyone."
Structured training, especially for complex platforms like the Omron CJ or NJ series, emphasizes documentation practices, structured naming conventions, and modular design—precisely the things that make a program maintainable. You don't learn those from a weekend of self-study.
What Actually Works (and What Doesn't)
I'm not saying formal training is the only path. I've seen brilliant engineers who are almost entirely self-taught. But they're the exception, not the rule. And even they admit it took years of costly trial and error to get where they are.
What I recommend to teams I work with:
- Start with the free resources. Omron offers free online PLC training modules that cover the basics of CX-Programmer, the Sysmac Studio environment, and safety PLC configuration. That's not the full depth, but it's a solid foundation.
- Do the formal course for complex platforms. If you're working with NX or NJ series, or integrating safety PLCs, the paid training is worth it. The architecture differences alone—like the separation of safety and standard control—will trip you up if you're guessing.
- Use the free trial wisely. The Sysmac Studio trial gives you 30 days of full functionality. That's enough to work through a structured training curriculum if you block out focused time.
- Build a checklist. After seeing so many foundational errors, I created a simple quality check for PLC programs: proper task configuration, consistent addressing, documented I/O mapping, safety logic review. It catches 80% of the issues I used to find in audits.
Pricing for training varies—expect $400–$800 for a multi-day virtual course as of early 2025, depending on the provider. That's a fraction of the cost of a single redo. Verify current pricing directly with distributors or training partners.
Final Thought: The Cost of Avoidance
The most frustrating part of my job is watching good engineers make avoidable mistakes—not because they're careless, but because they never had the chance to learn the right patterns. They optimized for short-term effort (skip training, start coding) and ended up paying a long-term price.
I've seen versions of this story play out for over four years now. When I implemented our verification protocol in 2022, I required training certificates for any engineer submitting safety PLC programs. Complaints dropped by about 34% within six months.
That's not because training made them smarter. It's because training gave them a shared language—a way of thinking about PLC programming that goes beyond 'get the machine to move.'
Recently, a colleague asked me what the most cost-effective improvement is for a new automation team. I said without hesitation: "Send them to training. Not because they can't figure it out on their own. But because the mistakes they'd make in the first year will cost more than the training ever will."
He laughed. Then he checked his budget. The training was approved.
