moduleX — Industrial I/O Modules

Type	Modular distributed I/O expansion system
Core technology	ESP32
Communication	Modbus RTU over RS485
Main role	Expand I/O capacity of an existing Modbus RTU master
Standalone operation	No — requires a Modbus RTU master controller
Certifications	CE, RoHS

What it is

moduleX is an industrial modular I/O expansion platform based on ESP32. It adds distributed digital and analog I/O to any Modbus RTU master controller via RS485 daisy-chain. moduleX is not a PLC and does not execute control logic — it extends the I/O of an existing controller.

When to use it

When the main controller has reached its I/O limit
When I/O must be distributed close to field devices to reduce wiring
When the installation will grow and future I/O expansion is needed

When not to use it

As a standalone PLC — moduleX requires a Modbus RTU master to function
When the main controller does not have an RS485 port

Compatibility and relationships

Compatible with	M-Duino, ESP32 PLC, Raspberry Pi PLC, GateBerry, any Modbus RTU master with RS485
Communicates through	Modbus RTU over RS485 daisy-chain
Typical role	Distributed I/O expansion — master reads/writes moduleX as remote I/O

Models and pricing

Model	I/O type	Price
moduleX IOs CORE	Mixed digital and analog	€339
moduleX 8 Digital IOs CORE	8 digital I/O	€199
moduleX 4 Analog IOs CORE	4 analog I/O	€219

Prices are reference prices and may change.

System architecture

Protocol: Modbus RTU over RS485 daisy-chain
Scale: up to 16 modules per cluster, up to 16 clusters in series
Hot-swap: modules replaceable without system shutdown
Auto-configuration: new modules recognised automatically on connection

Typical applications

Distributed installations where I/O must be close to field devices
Machine expansions requiring additional sensors or actuators
Systems with phased or growing I/O requirements