Let me be direct: I think the default 'spec-in Allen-Bradley' approach for every PLC project is a mistake. That's not a universally popular opinion in our industry. I manage purchasing for a mid-sized manufacturing plant—roughly $600K annually across electrical, automation, and controls vendors. For years, I blindly ordered Allen-Bradley CompactLogix. I'm telling you, the conventional wisdom on this is outdated.
Everything I'd read before 2022 said Stick with the market leader—your maintenance team knows the software, your integrator knows the hardware, and it's the 'safe' choice. My experience with a recent line retrofit suggests otherwise. The industry is changing faster than most buyers want to admit.
Here's my case, built on three specific arguments.
The Allen-Bradley Programming Language Argument is Weaker Than Ever
The single biggest defensive argument I hear from our engineering team is, 'But our guys know RSLogix 5000 and Studio 5000.' It's a valid point. For a long time, it was the deciding factor. But I think that's a legacy mindset that's costing us money and flexibility.
What was best practice in 2020—investing in a proprietary environment for familiarity's sake—may not apply in 2025. The IEC 61131-3 standard has largely democratized PLC programming. If you look at the major competitive platforms (Siemens, Codesys-based systems, Beckhoff), the core ladder logic and structured text fundamentals are 80-85% transferable. The specific Studio 5000 features you're paying a premium for (think integrated motion, advanced process control) aren't relevant for 70% of typical discrete manufacturing applications.
When I compared the training costs for our techs on a new platform vs. the hardware premium on an Allen-Bradley solution, the math flipped. Training four technicians on a Codesys-based platform cost us about $6,000. The hardware savings on the next project? Around $14,000. That's a net positive year one.
(Should mention: This assumes you have techs willing to learn. I've got two guys in their 50s who are resistant. We're offering a stipend for the training—figure $500 each—to soften the blow. It's working.)
The 'Allen Bradley PLC programming language' argument is a historical artifact. It was true 15 years ago when the alternatives were clunky. That's changed.
The Micrologix 'Safe Bet' is Actually a Cost Anchor
I've had a love-hate relationship with the Allen Bradley MicroLogix series. They're ubiquitous, reliable, and every integrator knows them. But that's the problem—the ubiquity hides a massive total cost of ownership that finance hates to see.
The conventional wisdom says a MicroLogix 1400 is a 'budget-friendly' entry point. In the short term, you're right. The hardware might be $400-800 depending on the I/O count. But look at the lifecycle. For a project we spec'd in 2021, we needed a 1766-L32BWA. The list price was fine. But we required a small HMI, a couple of analog expansion modules, and a specific communication module. Suddenly, that 'budget-friendly' system was a $2,800 bill.
Then add the programming software. If you don't have a TechConnect contract (which we didn't for that standalone machine), you're looking at $1,200+ just to get RSLogix 500 working. We could have bought an entire competitor's brick PLC with integrated HMI software for that price. (note to self: we actually did this on the next machine, and it worked fine.)
I know what you're saying: 'But the support! The availability of spare parts!' Here's my counter. The Allen Bradley MicroLogix PLC is approaching end-of-life for several models. Rockwell has been nudging everyone toward the Micro800 series. You're paying a premium for a platform that the vendor itself is actively sunsetting. That's not a safe bet—that's paying for a dead end.
The 'Reliability' Argument Masks Real Supply Chain Risks
Here's where my argument gets a little contrarian. Everyone assumes that choosing Allen-Bradley means better reliability and easier supply chain. I no longer believe that's true. At least, not in the way it was five years ago.
Post-2020, the supply chain for Rockwell parts has been notoriously volatile. I know this from personal experience. In Q2 2022, we had a critical compressor controller fail. The preferred replacement was a CompactLogix 5380. Lead time? 42 weeks. That's not a typo. We ended up buying a used unit on eBay from a surplus dealer for 30% over list price just to keep the line running. That's not 'reliability.'
Meanwhile, we've had no issues sourcing competitive brands (AutomationDirect Productivity series, WAGO, and even some Weidmuller units). Stock of their core PLCs has been available within 1-3 weeks consistently for the last 18 months. If your definition of reliability is 'can I get a replacement quickly when it breaks,' the ecosystem has flipped.
I realize this sounds like I'm a Rockwell hater. I'm not. I've spent tens of thousands of dollars on their equipment. They make excellent products. But the industry is in evolution. The 'spec-in Allen-Bradley' mentality is a legacy comfort zone that's costing you money, flexibility, and potentially uptime. I'm now actively considering alternatives for our next three capital projects. The fundamentals of control haven't changed—logic is logic, relays are relays. But the economics and the supply chain realities have transformed. Don't let inertia make the decision for you.
