Buy available stock
View current AO listings for PLCs, I/O modules, drives and HMIs. See the stated condition, test information and buying options for each individual unit.
Browse current stock →UK industrial automation · Buy spare parts · Sell surplus stock
Buy spares. Sell surplus.
Keep your plant moving.
Need a PLC, HMI or drive? Browse AO-listed stock or ask our UK engineer-led team to source an exact part number. Have unused Siemens, Allen-Bradley or other industrial automation equipment? Request an assessment for selective outright purchase or seller-held consignment.
UK-based controls engineerSelective purchase or consignmentVerified parts and condition details
Keeping older PLCs running? Check up to 5 part numbers free →
For factories, maintenance stores and surplus stockholders
Surplus PLCs, HMIs or drives?
We assess suitable new, used and obsolete automation stock across the UK. Ask about a selective outright offer or seller-held consignment. A list and a few photos are enough to start.
AO engineering services · Cambridgeshire and UK remote
Need a controls engineer, not just a spare part?
PLC changes, HMI upgrades, machine diagnostics and industrial control panel builds. Speak directly to an experienced controls engineer about the job.
PLC programming
Siemens TIA Portal, Omron, Mitsubishi and Allen-Bradley modifications and diagnostics.
PLC engineering services →HMI development
Operator screen changes, alarms, diagnostics and legacy screen upgrades.
HMI programming services →Control panel builds
Machine control panels, upgrades, wiring, testing and agreed documentation.
Panel design and build →One specialist · three ways to work with us
What brings you here?
Choose the route that matches what you need. Real stock and sourcing requests are handled differently so there's no confusion.
Find an obsolete part
Not on the shelf? Send your full manufacturer part number and required condition. We'll investigate possible sources and provide a quotation if supply is confirmed.
Explore sourcing →Sell or consign stock
Turn redundant automation equipment into working capital. Ask about a selective outright purchase or managed resale for suitable seller-held stock.
A stock list and a few photos are enough to start.
Sell to Automation Outlet →Request a surplus assessment →Prefer WhatsApp? Message Automation Outlet →
Manufacturer sourcing directory
Know the make? We'll find the route.
These are sourcing categories, not promises of warehouse stock. Actual supply, condition and price are confirmed against each enquiry.
PLC · HMI · Drives
SiemensS7-300, S7-400, SIMATIC HMI, SINAMICS and legacy automation components
Explore Siemens sourcing →
Logix · SLC · PanelViewAllen-BradleyControlLogix, CompactLogix, SLC 500, PanelView and PowerFlex families
Explore Allen-Bradley sourcing →
PLC · Servo · ControlsOmron & MitsubishiCJ/NX and MELSEC platforms, I/O, power supplies and selected drives
Browse other makes →
Exact part number requiredOther manufacturersABB, Schneider Electric, Lenze, Control Techniques and legacy controls
Request part sourcing →
Hand-picked stock
Automation Outlet Star Buys
Selected automation parts available now. Tap an item for full details, condition and buying options.
Clear sourcing, no pretend inventory
Know exactly what you're buying.
AO does not mark supplier-catalogue listings as ready to ship. Each transaction is matched to a specific unit and agreed terms.
01 / AO-LISTED STOCK
Listed for purchase
These products have individual AO stock listings, including their disclosed condition and available test information. Read the listing before you order.
02 / SOURCING ENQUIRY
Checked before quoting
For a hard-to-find order number, we check potential sources, revisions, quantity and lead time. You get a specific quote, not an invented availability figure.
03 / ENGINEERING CHECKS
Part number matters
We help identify the exact order code and questions to ask about compatibility, firmware and testing — useful when dealing with discontinued equipment.
Technical information, not just a parts list
Support for ageing controls systems.
Helpful maintenance and obsolescence guidance alongside our sourcing and stock services.
PLC lifecycle guide
Understand manufacturer lifecycle stages and plan replacements or critical-spares holdings before a failure stops production.
Read lifecycle guide →Bench test information
Find out what our stated visual, power-up and online-recognition checks include — and importantly what they do not prove.
Understand testing →Engineering services
Remote PLC support, audit and legacy-system analysis for teams maintaining older industrial equipment.
Explore services →Keep your options open
Connect with the AO network.
Whether you buy spares regularly or manage redundant spares in a factory, we have a route for you.
Buyer network & stock alerts
Tell us the Siemens, Allen-Bradley or other automation parts you're looking for. We can contact you when suitable AO-listed stock or relevant sourcing opportunities arise.
Register buying interests →Make dormant spares useful
Our factory spares network is exploring a private, brokered way for participating sites to make surplus and difficult-to-find spares more useful. Other factories cannot browse your stock list.
Explore the pilot →A practical sourcing partner
Got the part number? Start here.
Whether you're trying to restart a machine or assemble a sensible spares holding, send us the exact code and we'll investigate.
Free PLC fault-finding resources
Practical information first, with sourcing available if diagnostics confirm you need a replacement.
Troubleshooting
Siemens S7-300 SF / BF fault
Check LED indications, the diagnostic buffer and network evidence before replacing the CPU.
Read the diagnostic guide →Engineering knowledge
PLC fault guides
Free fault-finding information, a replacement checklist and engineering tools.
Browse the resource hub →Connect with Automation Outlet
Visit our LinkedIn pageFollow our stock & engineering updates
See surplus automation stock, available spares and updates from the engineer-run business behind Automation Outlet.
Free resource for engineers
AO Engineering Toolbox
Generate wire, terminal and PLC I/O labels from Excel or CSV. Free A4 printing; no account or spreadsheet upload required.
Explore the free tools → Wire label generator →Browse live automation stock
Check current UK stock by manufacturer, then open a part-number listing for condition, availability and buying details.