Nov 9, 2022 · In this article, you will learn the Modbus communication protocol function codes and address range with examples.

MODBUS is a request/reply protocol and offers services specified by function codes. MODBUS function codes are elements of MODBUS request/reply PDUs. The objective of this document is to describe …

The function code in the request tells the addressed slave device what kind of action to perform. The data bytes contains any additional information that the slave will need to perform the function.

Complete guide to Modbus function codes - what they do, when to use them, PyModbus implementation.

Function code is 1 byte which gives the code of the function to execute. Function codes are integer values, ranging from 1 to 255, and the range from 128 to 255 is for exception responses. The data …

Jan 9, 2025 · The following chart offers quick reference to the Modbus function codes, their purposes, and the memory types they interact with. Use this as a handy guide when configuring or …

Jan 30, 2023 · Modbus is one of the oldest industrial communication protocols still in use today. Continue reading to find out how the protocol works and how to use it for monitoring and control.

Oct 4, 2025 · Modbus function codes are used to specify the type of action to perform during a Modbus request. Some commonly used function codes include reading data, writing data, writing multiple …

These are used to read data from discrete inputs and input registers. They can also read/write data on coils and holding registers of each Modbus device you address. The following is a table of object …

In this post, we’ll look at the most essential function codes used in Modbus systems, explain what they do, and explore how they’re applied in real-world automation environments.