Best IO Modules of 2026
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IO modules are electronic devices that allow for the expansion of input/output (IO) capabilities in various systems. These modules are designed to provide additional digital or analogue inputs and outputs, which can be used to control and monitor various devices and processes. IO modules are commonly used in industrial automation, building automation, and other control applications where there is a need to interface with external devices. These devices are highly versatile and can be easily integrated with existing systems to provide additional functionality and improve system performance.
At a Glance: Our Top Picks
#TOP 1
9.8
#TOP 2
9.7
#TOP 3
9.5
Top 3 IO Modules
DollaTek PCF8574 I/O Expansion Board Module
The DollaTek I/O Expansion Board offers a standard interface that can easily integrate with various development boards. This product features an I2C serial port that converts to an 8-bit parallel port, allowing you to expand capabilities up to 64 outputs. It utilises the PCF8574 IO expansion chip, ensuring efficient performance. Compatible with platforms like Arduino, AVR, and ARM, this board provides you with the versatility needed for diverse projects.
Garosa 16 Channel IO Extension Module MCP23017
The Garosa MCP23017 IO Module is designed to expand your device’s input and output capabilities with 16 flexible channels. It supports both 5V and 3.3V systems, making it versatile for various projects. The high-speed I2C interface offers multiple frequency options, including 100KHz, 400KHz, and 1.7MHz, allowing you to communicate quickly and efficiently. This module uses the reliable MicroChip MCP23017 chip, which lets you configure each channel as input or output, set pull-up resistors, and enable interrupts for inputs, giving you greater control and functionality.
Fasizi 5pcs PCF8574 I/O Expansion Board Module
The Fasizi PCF8574 I/O Expander is a versatile module designed for various development boards. It features a standard interface, allowing you to easily expand your projects. With its I2C serial port converting to an 8-bit parallel port, you can connect up to 64 devices, enhancing your project's capabilities. This module is compatible with popular platforms like Arduino, AVR, and ARM, making it a convenient addition to your toolkit. Its pin or row seat design offers flexibility for different setups.
Frequently Asked Questions (FAQs)
1. What is IO module?
An I/O module is a subsystem in an integrated circuit that performs the functionality specific to interfacing a CPU to the rest of the system. It can also refer to configurable switches called I/O relay modules for switching the power to an external load.
2. What are the major function of an I O module?
The I/O Module's Key Tasks Device communication – It needs to be able to perform standard device communications, such as reporting of status. Control and timing – An I/O module needs to be capable of managing data flow between a computer's internal resources and any connected external devices.
3. What is I O module in PLC?
The main function of a PLC I/O module is to process communication that is being sent to the PLC and accept the commands sent from a processor. PLC I/O modules can also be used to detect processing errors, run system reports and manage the flow of data.
4. What are some common I O module types?
Types of I/O. There are three types of I/O operations:Sensory input. digital input. analog input.Control output. direct digital output. modulated digital output. analog output.Data transfer. parallel. serial.
During our io module research, we found 306 io module products and shortlisted 3 quality products. We collected and analyzed 3,532 customer reviews through our big data system to write the io modules list. We found that most customers choose io modules with an average price of £20.00.
The io modules are available for purchase. We have researched hundreds of brands and picked the top brands of io modules, including DollaTek, Garosa, Fasizi.
Harvey Wall was born and raised in Norwich. He mastered the art of tool production and finished at the prestigious Norwich University. His area of interest include cutting tools, abrasive finishing and power tools. Harvey is always looking for ways to improve the finesse of industrial tools via his myriads of researches. He also shares some of his experiences on many platforms while writing on tool products.