One post tagged with "data-collection"

If you've ever stared at a PLC register map wondering why address 300001 means something completely different from 400001, or why your edge gateway reads all zeros from a register that should contain temperature data — this guide is for you.

Modbus has been the lingua franca of industrial automation for nearly five decades. Its longevity comes from simplicity, but that simplicity hides a handful of conventions that trip up even experienced engineers. The addressing scheme and its relationship to function codes is the single most important concept to nail before you write a single line of polling logic.

Let's break it apart.