Mechatronics, Industrial Control & Instrumentation

How Modbus is used in Industrial Networks

Modbus is an open standardized communication protocol that was founded by Modicon. Initially it was designed for the communication among PLCs in industrial applications but it also gained significance use in building automation domain for instance in HVAC systems, DDCs and room control.

In a nutshell, Modbus is an application layer messaging, protocol placed at OSI layer 7, for client/server communication between devices connected on different types of buses or networks. Modbus is a lightweight application layer protocol that facilitates different media. Modbus-TCP, a Modbus version based on TCP, is part of the fieldbus standard IEC 61158.

Modbus is transported using any of the following layers:

  • TCP/IP
  • RS232, RS422, RS485
  • Modbus Plus, a token-passing network
  • Other types of media like Fiber, Radio, Cellular

An example of a Modbus network is shown below:

Modbus Network
Figure 1.0 Modbus Network

Related: Features of Popular Fieldbuses used in Industrial Networking

Share
John Mulindi

John Mulindi is an Industrial Instrumentation and Control Professional with a wide range of experience in electrical and electronics, process measurement, control systems and automation. In free time he spends time reading, taking adventure walks and watching football.

Recent Posts

What to Expect from PCB Assembly Services in China

The importance of printed circuit board (PCB) technology has escalated throughout the years with the…

2 days ago

Magneto-Optic Current Sensors for High Voltage, High Power Transmission Lines

One of the key challenges in measuring the electrical current in high voltage, high power…

4 days ago

How the Wiegand Effect is used in Sensing Instruments

The Concept behind Wiegand Effect Based Sensors   The Wiegand effect technology employs the unique…

6 days ago

Piezoelectric Accelerometer: Principle of Operation & Applications

An accelerometer is a sensor that is designed to measure acceleration or rate of change…

1 week ago

The USB-6009 Data Acquisition Card Features

The USB-6009 is a small external data acquisition and control device manufactured by National Instruments…

1 week ago

How X-Y Tables are used in Position Control Applications

X-Y tables are utilized as components in many systems where reprogrammable position control is desired.…

2 weeks ago