Manual: PLC Variable Inputs/Outputs

Practical guide to common PLC input/output configuration errors. We break down the 8 most frequent pitfalls: wrong port numbering (I0.0 ≠ IX0.0), mismatch between physical and logical addresses, NC E‑stop contact inversion, incorrect analog input types, confusion between 0–10 V and 4–20 mA signals, filtering, and sensor scaling. Why is it critical? IO configuration is the bridge between wiring and code. One mistake can mean equipment failure, safety risks, and years of troubleshooting. Includes PLC addressing tables, checklists, and a documentation template (button → terminal I2.0 → address I2.0). For instrument technicians and commissioning engineers — configure IOs right the first time!