If you've ever tried to Google a straightforward "Siemens PLC price list" or hunted for a reliable "Siemens PLC programming examples PDF," you know the results can be a mess. One vendor quotes $400 for a CPU, another says $1,200. One forum post has a TIA Portal snippet that works perfectly, another has one that locks up your CPU.
Here's the thing: there isn't one answer. The right price and the right programming resource depend entirely on your situation. So instead of pretending there's a universal solution, let's walk through three common scenarios. Figure out where you fit, and I'll give you specific, actionable advice.
This is the most straightforward case, but also where most people overpay. Say you're specifying controls for a new packaging line. You need reliability, support, and a modern platform.
When you look at an official Siemens price list for an S7-1200 starter kit (CPU 1212C, 8 DI/6 DO, 2 AI), the list price might be around $350. But here's the kicker: that's just the CPU. By the time you add a proper power supply, signal boards, and a programming cable, you're looking at $700–$900 for a minimal setup.
My advice: Don't buy the cheapest PLC on the list. I reviewed a batch of 200+ items for a project in Q1 2024, and the most common rejection was due to underspecified CPUs. People tried to save $150 on a lower-end 1200 and ended up with no spare capacity for a simple HMI connection. Pay the extra $200 for the 1215C. Seriously, it's way more cost-effective than upgrading later.
Oh, and I should add: the price list you see from Siemens directly is usually the list price. Authorized distributors often give 20–30% off on full kits. We saved about $1,400 on a $4,800 order just by getting a quote from three different distributors instead of buying off the list.
Don't grab the first "Siemens PLC programming examples PDF" you find on a forum. Take this from someone who's been burned: the example might be for a S7-300 with Step 7 Classic, and you're trying to run it on TIA Portal v17. That mismatch cost us a $22,000 redo and delayed our launch by two weeks.
What works: Use the official Siemens support portal (SIOS). Their application examples are tested, they're tagged with the exact TIA Portal version, and they include downloadable source files. I'm not 100% sure, but I think there are over 400 free examples there. The quality is pretty good for something free.
This is where things get interesting. If you're keeping a 15-year-old production line running with an S7-300, your priorities are different. You don't care about the latest features. You care about getting a replacement module that works today.
Looking back, I should have budgeted for the expedited shipping on a critical S7-300 CPU replacement. At the time, the standard delivery window seemed safe. It wasn't. A lead time that was quoted as "2-3 weeks" turned into 5 weeks when the distributor's stock ran out. The production downtime cost us $15,000.
My advice for this scenario: Pay the premium for guaranteed delivery. If you find a used S7-300 CPU on eBay for $400 vs. a certified refurbished one for $900, the $500 difference is your insurance policy. Calculate the worst case: if the used one fails in 3 months, you lose another $1,000 in troubleshooting time and rush shipping. The expected value says go with the certified unit, and the downside of getting it wrong feels catastrophic.
Bottom line for Siemens PLC: For legacy systems, availability matters more than price. A part that's on the shelf and guaranteed to work for 12 months is worth more than an untested one for half the cost.
If you're pairing a legacy S7-300 with a new IEC contactor, check the coil rating. I said "24 VDC." They heard "24 VAC." Result: fried coils on 16 units. We both said "standard 24 volt" but meant different things. Discovered this when the first batch of contactors arrived and none of them pulled in. Since then, every contract includes the explicit DC/AC spec on the contactor coil.
Maybe you're an electrician who needs a simple PLC for a one-off machine, or a small business owner automating a packaging process. You don't need a massive automation stack. You need something that works, has some examples you can copy-paste, and doesn't require a certified Siemens course.
This is the scenario where most people get it wrong. They buy a full S7-1200 starter kit for $800, when a Siemens Logo! module for $250 would do the job. But then again, if you think you'll expand later, the S7-1200 is a better bet.
My take: If your project has fewer than 20 I/O points, no complex math, and you don't need multi-axis motion control, the Logo! is super capable. I've seen people build working conveyor controls with it. The downside? Programming is in Ladder Diagram or Function Block, not the full TIA Portal environment. So if you eventually upgrade, you'll have to reprogram everything.
The upside of an S7-1200 for $800 is that you get TIA Portal compatibility, which has a ton more free examples and community support. That's worth maybe $200 in saved frustration over the first project alone. Roughly speaking, I'd say 70% of small projects in this bracket should just go with the 1200 and skip the second-guessing.
For this budget scenario, I'd recommend bypassing the random PDFs and using YouTube walkthroughs from channels like "IT and Automation" or "RealPars." They walk through specific programming examples for, say, a traffic light sequence or a motor start-stop. Then download the PDF from the video description. That's way more practical than trying to parse a dry application note.
Trust me on this one: if you've ever followed a programming example PDF and found that the function block you need doesn't exist in your software version, you know that sinking feeling. So check the version before you start.
Still unsure? Here's a quick litmus test:
Remember: the right choice depends on your timeline, your risk tolerance, and how much you value certainty. In March 2024, we paid $400 extra for rush delivery on a PLC. The alternative was missing a $15,000 event. Would you have made the same call?