PLC I/O Module Market Value
Analysis of 677,318 eBay listings for PLC input and output modules.
What you'll usually pay
💡 Buying used saves about 52% here.
👉 In short easy summary
The best value is found in Beckhoff modules (-55% vs median) and PLC-5 platforms (-49%). Conversely, Siemens modules (+33%) and CompactLogix platforms (+36%) command the highest premiums.
💚 Best value for your money
Price by brand
Why? Prices vary by manufacturer, with Siemens at 208.44 and Beckhoff at 69.99.
Price by type
Why? Combined I/O modules are more expensive (201.1) than dedicated output modules (130.17).
Price by analog/digital
Why? Analog modules carry a 30% premium over the median, while digital modules are 26% lower.
Price by controller platform
Why? Modern platforms like CompactLogix (212.5) cost significantly more than legacy PLC-5 units (79.9).
🛒 Some on sale right now
Common questions
What is the price difference between new and used PLC modules?
New modules have a median price of 189, while used modules have a median of 89.99.
Which brand is the most affordable on the secondary market?
Beckhoff is the most affordable brand with a median price of 69.99.
How do analog modules compare to digital modules in price?
Analog modules have a median price of 203.55, whereas digital modules are lower at 116.25.
How we got these numbers
Worked out from 200 live eBay listings (price range $29–$539, odd outliers ignored). These are asking prices, so use them as a guide. Last checked July 31, 2026.