AO Engineering Toolbox
Practical tools for maintenance engineers, controls engineers and electrical panel builders. Use them without creating an account — built to save time on repetitive engineering admin.
Free tools you can use today
Start with a real job: import the I/O list, check the addresses and print your labels.
Wire, terminal & PLC I/O label generator
Import Excel .xlsx or CSV, match columns, edit labels and create A4 prints or a PDF. Supports wire numbers, terminal identifiers and PLC tags, plus a cleaned CSV export.
Use the free label generator →For real engineering work
These utilities help format information; they do not check electrical safety or replace approved drawings.
Keep the I/O readable
Turn a PLC point list into consistent printable labels and schedules, rather than retyping every address.
Reduce label setup work
Prepare wire and terminal identifiers from spreadsheet columns and inspect the result before printing.
Keep engineering data private
The free generator processes spreadsheet content in your browser; files are not sent to AO's server.
Want to suggest the next free tool? Tell us the tedious engineering task you want to automate.
Need a replacement PLC, HMI or drive?
AO also sources discontinued automation spares and supports bench testing. Tool use is free and there is no obligation to buy.
Free PLC fault-finding resources
Practical information first, with sourcing available if diagnostics confirm you need a replacement.
Siemens S7-300 SF / BF fault
Check LED indications, the diagnostic buffer and network evidence before replacing the CPU.
Read the diagnostic guide →PLC fault guides
Free fault-finding information, a replacement checklist and engineering tools.
Browse the resource hub →