I believe transparent pricing is worth more than a low price. If that sounds obvious, you haven't bought a Siemens PLC.
I'm an office administrator at a 220-person manufacturing company. Since 2020, I've managed purchasing for our maintenance and controls teams—roughly $1.8 million annually across 14 vendors. I don't design control systems and I don't wire panels. I approve purchase orders, and I report to both operations and finance. In a way, that puts me between the engineer who wants a PLC and the finance team that wants a predictable budget. The biggest lesson from four years of buying Siemens PLCs is simple: the difference between a good quote and a bad quote is not the price. It's what's missing.
When I first took over purchasing in 2020, my approach was embarrassingly simple: get three quotes, choose the lowest. That's the classic rookie mistake. It cost us about $4,800 in rework and made me look bad when the maintenance manager asked why the 'savings' vanished after we added software, shipping, and rush charges.
It took me four years and over 240 purchase orders to understand that a quote is a story, not a number.
The quote that changed how I buy Siemens PLCs
We needed an S7-1500 for a packaging upgrade. One broker quote came in 15% under the distributor we usually used. I was thrilled. My manager was thrilled. The controls engineer reviewing it said, 'This is missing a few things.' I told him procurement would handle the details.
The details were the problem. The quote didn't include the TIA Portal engineering license. It didn't include delivery to our building. It didn't include any provision for dead-on-arrival hardware. When the module arrived with a damaged connector, the broker said we had to pay the freight back before they would talk about a replacement. We lost eight production days. The 'savings' didn't just disappear. They became a lesson in total cost of ownership.
Now I ask one question before I ask the price: What's not included?
What the 'PLC market share 2025: Siemens vs Rockwell' reports don't tell you
I get asked about the PLC market share 2025: Siemens vs Rockwell story a lot. Most market research published in early 2025 puts Siemens at the top of the global PLC market by revenue, while Rockwell Automation and Allen-Bradley remain very strong in North America. I do not have the full datasets in front of me, so I won't quote exact percentages. What I can tell you from the buying side is that market share articles miss the real point: the hardware is not the whole product. The ecosystem is.
With Siemens PLCs, you're also buying into TIA Portal, training, spare parts availability, technical support, and security standards like IEC 62443. If one vendor gives you clear line items for those pieces, and another vendor hides them in a footnote, the clear line item is the better deal—even if it's 5-10% higher at first glance. That's not an opinion about machine code. It's an opinion about honesty.
The LOGO! PLC lesson: when the cheaper suggestion is the honest one
One of the best purchasing decisions I didn't make was for a small packaging station. The controls engineer initially asked for two Siemens S7-1200s. The distributor replied, 'You probably don't need S7-1200s. A LOGO! PLC from Siemens can do the job.'
If you search 'logo plc siemens,' you'll find a small controller that looks more like a fancy switch than a traditional PLC. It's not a replacement for an S7-1500. But for simple logic, a few timers, and a handful of I/O points, it was perfect. The distributor could have sold us the larger controllers and made more margin. Instead, they told us to spend less. That one moment built more trust than a dozen discount offers.
We spent roughly $3,800 less than budgeted and saved about four weeks of engineering time. The rep didn't have to do that. Transparent pricing isn't only about line items. Sometimes it's about telling a customer they don't need a product at all.
It's the same lesson with a multimeter and a 30kw home generator
This way of thinking followed me home. My maintenance supervisor decided he could replace a wall outlet in the break room. He watched a tutorial called 'how to install electrical outlet' and searched 'multimeter home depot' to find a cheap one. The outlet cost $14, the multimeter cost $25. Turned out the old metal box didn't have a ground wire. The job needed an electrician: $210. The cheap DIY approach cost more, and it took extra time.
Around the same time, my brother got three quotes for a 30kw home generator. The cheapest was $12,500. The highest was $13,400. He almost went with the cheap one because 'it's basically the same machine.' Then he read the fine print: the low bid didn't include the concrete pad, the transfer switch, the permit, or the electrical connection. Those items added about $1,900. The 'expensive' bid included all of them. He paid the higher quote and ended up about $1,000 ahead.
For both projects, the lesson wasn't that the cheap option is bad. It was that the only reliable price is the total price.
What a 2024 vendor consolidation taught me
During our 2024 vendor consolidation project, finance asked us to cut our supplier list from 14 to 5 and target an 8% savings. The easiest way was to give the work to the vendors with the lowest quotes across a basket of parts. We almost did that. Then I pulled the invoice histories.
The comparison was striking. One supplier's final invoices averaged 12% above their original quotes. Another supplier's invoices averaged 2% below their quotes because of credits and early-payment terms. The low initial quote was not the low final cost. We consolidated around the supplier whose quote became the invoice, not the supplier with the flashiest opening number.
Honestly, I don't remember if that supplier was the Siemens distributor. It doesn't matter. The metric matters: measure whether the quote becomes the invoice. That's a number you can't fake.
To be fair: yes, you should read the quote
I know what some people will say. 'If you'd read the quote carefully, you would have seen what's missing.' That's fair. Some vendors assume the buyer knows the industry. A quote for a PLC often won't list software or programming because the vendor expects you to know those are separate. And if budget is tight, it's tempting to stare at the bottom line and ignore the fine print.
But here's the thing: procurement shouldn't need a law degree to decode a quote. If the person selling an S7-1500 or a generator doesn't mention the most common missing items, that's not a clever pricing model. It's a red flag. In my job, when a total order ends up 25% higher than the approved quote, I have to explain it to the VP. That's not just awkward. It destroys trust—and once trust is gone, a 'good deal' feels like a trick.
What I ask before approving any PLC purchase
I've developed a short list over the years. It's not an engineer's checklist. It's a checklist for someone who has been burned:
- Is the total cost line-itemed, including software, freight, and any fees?
- What is the real lead time, in days, from the moment I sign? And what happens if it slips?
- What is the return or replacement process if a module arrives damaged?
- Does the vendor recommend equipment that fits the application, even if it's less expensive?
Vendors who answer these questions without getting defensive are the ones I keep. The ones who say 'that's not our problem' or 'you'll have to read the terms' do not get a second order—no matter how low their quote is.
Bottom line: Transparency is the real differentiator
So I will keep saying this: the lowest quote for a Siemens PLC is only truly low if it stays low after you add everything. The same goes for a 30kw home generator, a $25 multimeter from Home Depot, or an outlet installation video that turns into a service call. The price you see at the beginning should be the price you pay at the end. If a vendor cannot offer that, they haven't given you a quote. They've given you a guess.
I'm not saying Siemens PLCs are always the cheapest option. They're often not. But that's not why I buy them. I buy from vendors who are transparent about the total cost, because I have to live with that number after the invoice arrives. That's not a marketing position. It's the difference between buying something and simply paying for it.
Bottom line: ask 'what's not included' before you ask 'how much.' If a vendor can't answer that clearly, walk away. The hidden fee is already waiting behind the low number.