I get asked this a lot. Not just by system integrators, but by plant engineers who are getting pressure from management to 'standardize.' The short answer? Siemens holds a larger installed base in Mexico, but Allen-Bradley is far from gone.
Based on data I've seen from industry reports (and my own experience with about 200+ automation projects in the last five years), Siemens has roughly a 35–40% share of the PLC market in Mexico, compared to Allen-Bradley's 25–30%. The rest is split between Schneider, Mitsubishi, and smaller players. That gap has been widening since 2020, largely because Siemens pushed hard into the automotive and food & beverage sectors here.
From my perspective, though, that headline number hides a more important story: regional dominance varies wildly. If you're in a plant in Monterrey that supplies to an automotive Tier 1, you might find 80% Siemens. But a standalone water treatment plant in Guadalajara? Of course it's often Rockwell or Modicon. So the real question you should be asking isn't 'which is more popular,' it's 'which one will my local support ecosystem actually handle?'
Yes, but let me be clear about what that means for a maintenance engineer or integrator. Siemens introduced signed firmware for its S7-1200 and S7-1500 series a few years ago. The idea is that only firmware digitally signed by Siemens can be loaded onto the controller. This prevents unauthorized or malicious firmware from being installed.
I'll be honest—in my early days, I saw this as a hassle. When we had a batch of controllers that needed a firmware update for a new security patch, the process was slower because the TIA Portal needed to verify the signature. But after a client of mine in the pharmaceutical sector got hit by a ransomware attack that specifically targeted a legacy Allen-Bradley system (which didn't have signed firmware at the time), I changed my mind.
From a practical standpoint, this means:
To be fair, Rockwell has since added signed firmware to newer ControlLogix models, so the gap is closing. But in 2025, Siemens still has the edge in terms of maturity and the number of products covered.
No, not directly. And I admit, when I first started researching this keyword cluster, I had a laugh. A 'Ford fuel pump driver module (FPDM)' is a standalone electronic component for a car's fuel system. It's not a programmable logic controller, and it has nothing to do with Siemens automation. It's a common search confusion, probably because both terms involve 'module' and 'driver.'
If you're an engineer looking for a part for a Ford vehicle, you're on the wrong page. If you ended up here because you're looking for a 'drive' module for a Siemens PLC (like a Sinamics drive), then you're in the right place. Just wanted to clear that up.
This is another common point of confusion in industrial settings, especially when you're dealing with backup power for a control cabinet. I'm not a power systems expert, but from my experience integrating PLCs with drives, here's the simple breakdown:
The confusion arises because some 'generators' have an 'inverter' stage inside them (like modern portable inverter generators) to produce clean power. But in the context of your PLC system, you want to know: 'Is my Siemens PLC connected to a drive/inverter, or is it connected to a backup generator?' They serve completely different functions.
No. This is a local service search term for residential power backup. Siemens does make residential electrical components (like load centers and breakers), but they aren't the 'home generator service' provider. If you need a generator installed or repaired in Petaluma, you're looking for a local electrical contractor or a company like Generac's installers, not a Siemens PLC supplier.
I mention this because it's a good example of how SEO keywords can pull in a mismatched audience. For anyone reading this who is an engineer or an integrator: you can ignore that part. For anyone else who clicked by mistake: sorry, but you might want to search for 'generator repair Petaluma' instead.
I don't have a one-size-fits-all answer, and anyone who gives you one is oversimplifying. Based on my work:
The bottom line: the market share trend favors Siemens in Mexico, but practical experience and local support networks matter more than a national average. I can only speak to my context. Your mileage may vary.