Modbus® Protocol is a messaging structure developed by Modicon in 1979. It is used to establish master-slave/client-server communication between intelligent devices. It is a de facto standard, truly open and the most widely used network protocol in the industrial manufacturing environment. It has been implemented by hundreds of vendors on thousands of different devices to transfer discrete/analog I/O and register data between control devices. It’s a lingua franca or common denominator between different manufacturers. One report called it the “de facto standard in multi-vendor integration”. Industry analysts have reported over 7 million Modbus nodes in North America and Europe alone.
Where Modbus ® is used?
Modbus is used in multiple master-slave applications to monitor and program devices; to communicate between intelligent devices and sensors and instruments; to monitor field devices using PCs and HMIs. Modbus is also an ideal protocol for RTU applications where wireless communication is required. For this reason, it is used in innumerable gas and oil and substation applications. But Modbus is not only an industrial protocol. Building, infrastructure, transportation and energy applications also make use of its benefits.
TECP now offers an extended line of products that support Modbus®. Whether pressure, flow, temperature, level, there is a Modbus® offering that can be utilized by our customer base.
Modbus® is a serial communications protocol that is free from user royalties. Each device on the network has its own address that can be queried one at a time by a master device. It makes it possible for a client to daisy chain a large number of devices and varying devices. The daisy chain is a key part of this as it makes installation very easy and much less expensive.
In addition, it allows for field type end devices to be deployed across remote locations and be monitored by a single RTU, where wireless communications is required.
For more information and a list of those devices that are Modbus® related, ask your TECP rep!