The Modbus protocol is a communication standard used in the industrial field that allows interfacing different devices connected to the same network. The operating system takes place between a master, who manages the application, and one or more slaves that answer the master's queries.

Dimmer e centraline di controllo Dalcnet con bus Modbus


Ideal uses and applications for the Modbus standard

The Modbus security protocol is among the most used connection systems in the world within the industrial sector; in this regard, at the end of 2018, a new security protocol was introduced in order to improve the reliability of the entire control system. Thanks to this update, the stability of the entire system has been improved in order to increase the management standards of sensitive data.

How the Modbus standard works

For each common line, a master and a maximum of 247 slaves can be connected while the standard RS-485 interface provides a maximum of 31 connected slaves on the same line. To overcome this limit, however, it is possible to replace the last element of the line with a special repeater so as to connect the other 31 slaves and so on until the maximum logical number of associated devices is reached.

Any transaction can only be initiated by the master and can be directed to a single slave or a set of slaves.


What are the advantages of the Modbus standard

The Modbus protocol, although it was conceived over 40 years ago, is extremely used thanks to some peculiar characteristics: first of all its open and royalty-free structure have made it a customizable standard, the simplicity of installation and maintenance have also made it a protocol particularly suited to industrial environments where precision and efficiency are crucial.