Which Modbus functions are used for reading/writing multiple data on IO scanning in Modicon Quantum range.


30 September 2021

In Modicon Quantum range, I/O scanning works with following Modbus function codes:
  1. FC3 for Reading Multiple 4X registers.
  2. FC16 for Writing Multiple 4X registers.
  3. If both the read and write are filled out then FC23 for Read/Write Multiple 4X registers is used.