Hey there! As someone who's been through the trenches of factory floor automation, here are the top 3 unwritten rules I wish someone had told me during my first year:

1. It's not just about the logic - it's about the process. The biggest mistake new engineers make is focusing too much on perfect ladder logic while forgetting that understanding the actual manufacturing process is equally important. You can write flawless code, but if you don't understand how the machine should actually work, you'll create problems instead of solving them. Spend time with operators and maintenance staff - they know the quirks that aren't in any manual.

2. Code for the next person (who might be you at 3 AM). Write your ladder logic as if someone else will have to troubleshoot it during a midnight breakdown. Use clear comments, organize your rungs logically, and avoid clever but confusing shortcuts. Remember that the maintenance technician who gets called in at 2 AM might not be as familiar with your programming style as you are.

3. The factory floor is a living, breathing system. What works perfectly in simulation often needs tweaking in real life. Temperature variations, vibration, electrical noise, and mechanical wear all affect how your logic performs. Always leave room for adjustments and build in diagnostic tools from the start. The best ladder logic anticipates real-world imperfections.

These are the practical wisdoms that separate good automation engineers from great ones. The technical stuff you can learn from books, but these insights come from experience on the factory floor!