Remote I/O Modules

Selection of Industrial Remote I/O Modules and Distributed Acquisition Hosts by Ebyte. Engineered for high-performance automation, data acquisition, and industrial IoT (IIoT) frameworks, this collection bridges the gap between field sensors and centralized control systems (PLC/SCADA/Cloud).

Why Engineers Choose Ebyte Remote I/O Modules

Versatile Protocol Support: Seamlessly integrates into existing setups with native support for Modbus TCP and Modbus RTU protocols over RS485 and RJ45 Ethernet interfaces.

Flexible Splicing & Scalability: Features a modular distributed architecture allowing free splicing of Analog Input/Output (AI/AO), Digital Input/Output (DI/DO), and relay outputs.

High-Precision Sensing: Optimized for environmental monitoring with specialized RTD modules supporting high-precision PT100 temperature acquisition.

Ebyte Remote I/O Products Selection Guide

1. Product Line Overview & Screening Logic

Ebyte remote I/O products are divided into 4 major product lines, covering entry-level serial I/O, compact specialized acquisition, high-performance distributed bus I/O, and wireless remote I/O. You can quickly filter by the following dimensions:

Filter Dimension	Options & Corresponding Product Line
Fieldbus Protocol	RS485 Modbus RTU → MA01 Series (entry-level) Modbus TCP/RTU distributed → M31 Modbus Series Profinet (Siemens system) → M31 Profinet Series EtherCAT (motion control) → M31 EtherCAT Series CANopen → M31 CANopen Series
Transmission Mode	Wired → MA01 / ME31 / M31 Wired Series Wireless (long-range) → M31 LoRa Series Wireless (unlimited distance) → 4G Remote I/O Series
I/O Type	Digital DI/DO only → MA01 / M31 Digital Series Temperature acquisition (PT100/thermocouple) → ME31 Temperature Series Mixed DI/DO/AI → M31 Mixed Series
Scale & Density	Small point count (<8 channels) → MA01 / ME31 Large-scale expandable system → M31 Host + Expansion Modules

2. Detailed Parameter Comparison Tables

Table 1: MA01 Series – Entry-level RS485 Modbus RTU Remote I/O

Ideal for small-scale serial data acquisition and control, with triple-proof coating for industrial sites.

Model	DI Channels	DO Channels	AI Channels	Communication Interface	Protocol	Power Supply	Installation	Dimensions (mm)	Key Features
MA01-AXCX1010-V2P	1	1	0	RS485	Modbus RTU	DC 8–28V	DIN rail + positioning hole	90×90×40	Relay output, triple-proof coating
MA01-AXCX2020-V2P	2	2	0	RS485	Modbus RTU	DC 8–28V	DIN rail + positioning hole	90×90×40	Relay output, wet/dry contact support
MA01-AXCX3030-V2P	3	3	0	RS485	Modbus RTU	DC 8–28V	DIN rail + positioning hole	90×90×40	10A relay contact capacity
MA01-AXCX4040-V2P	4	4	0	RS485	Modbus RTU	DC 8–28V	DIN rail + positioning hole	90×90×40	Hongfa relay, multiple output modes
MA01-XHXX0800-V2P	0	0	8	RS485	Modbus RTU	DC 8–28V	DIN rail + positioning hole	136.5×40×90	16-bit ADC, 4–20mA / 0–10V input

Table 2: ME31 Series – Compact Specialized Remote I/O

Focus on temperature and analog precision acquisition, suitable for environmental monitoring and industrial temperature measurement scenarios.

Model	DI	DO	AI / Temperature Channels	Interface	Protocol	Power Supply	Installation	Dimensions (mm)	Application
ME31-AAAX2240	2	2	4 AI	RS485 / RJ45	Modbus RTU/TCP	DC 8–28V	DIN rail	74×25×102	General-purpose mixed acquisition
ME31-XDXX0400-485	0	0	4 × PT100 RTD	RS485	Modbus RTU	DC 8–28V	DIN rail / screw	121×72×34	Platinum resistance temperature measurement
ME31-XEXX0600	0	0	6 × K-type Thermocouple	RS485	Modbus RTU	DC 8–28V	DIN rail / screw	121×72×34	High-temperature thermocouple acquisition
ME31-XEXX0800-485	0	0	8 × K-type Thermocouple	RS485	Modbus RTU	DC 8–28V	DIN rail / screw	121×72×34	Multi-channel temperature monitoring
ME31-XAXX0600	0	0	6 AI (current/voltage)	RS485	Modbus RTU	DC 8–28V	DIN rail	121×72×34	High-precision analog acquisition

Table 3: M31 Series – High-performance Distributed Remote I/O

Second-generation modular design, supports host + expansion module splicing, covers multiple industrial bus protocols.

3.1 Modbus TCP/RTU Version

Model	Type	DI	DO	AI	Communication Interface	Bus Sync Speed	Power Supply	Mounting
M31-AAAX4440G-U	Host	4	4	4	2×RJ45 + RS485	≤1ms	DC 9–36V	DIN rail, spliceable
M31-GXAXX0A00-U	Expansion	16	0	0	RS485 (backplane)	≤1ms	DC 9–36V	DIN rail, spliceable
M31-GXXXA0008-U	Expansion	0	8	0	RS485 (backplane)	≤1ms	DC 9–36V	DIN rail, spliceable

3.2 Industrial Bus Versions

Model	Bus Protocol	DI	DO	AI	Interface	Key Compatibility	Power Supply
M31-AFAX4440G-U-PN	Profinet RT/IRT	4	4	4	2×RJ45	Siemens TIA Portal, Conformance Class B	DC 9–36V
M31-xxxx-U-CAT	EtherCAT	Configurable	Configurable	Configurable	2×RJ45	Low latency, distributed motion IO	DC 9–36V
M31-xxxx-U-CAN	CANopen	Configurable	Configurable	Configurable	2×CAN	CAN2.0A/B, CiA 301	DC 9–36V

3.3 LoRa Wireless Distributed I/O

Model	Frequency Band	DI	DO	AI	TX Power	Transmission Distance	Protocol	Power Supply
M31-AAAX4440G-L	410–493MHz	4	4	4	30dBm	10km (line-of-sight)	Modbus RTU over LoRa	DC 9–36V
M31-AXAX8080G-L9	850–930MHz	8	8	0	30dBm	10km (line-of-sight)	Modbus RTU over LoRa	DC 9–36V

Table 4: Wireless Remote Synchronous I/O (Signal Remote Transmission)

For long-distance wireless signal synchronization without wiring.

Series	Transmission Mode	DI/DO Channels	Transmission Distance	Power Supply	Key Features
E860-DTU LoRa Series	LoRa wireless	1/2/4/8 channels	10km	DC 8–28V	Real-time synchronous control, DIN rail
E860-DTU 4G Series	4G Cat.1 cellular	1/2/4/8 channels	Unlimited distance	DC 8–28V	Global network coverage, cloud management

3. Quick Selection Steps

Confirm bus protocol: Match the PLC/host system communication interface first.
Count I/O points: Calculate the required number of DI, DO, AI, AO and temperature channels.
Select wired or wireless: Choose wired for stable and high-speed scenarios; choose LoRa for long-distance wiring-free scenarios; choose 4G for cross-regional scenarios.
Select host or expansion: For systems with more than 16 points, use M31 host + expansion modules to reduce cost.
Verify environmental requirements: For harsh sites, prioritize models with triple-proof coating and wide voltage supply.

Applications

Smart Factory Automation: The M31 series distributed I/O (supporting Modbus, Profinet, EtherCAT fieldbuses) connects sensors and solenoid valves directly at production workstations, achieving ≤1ms bus synchronization. Its DIN-rail splice design allows flexible I/O expansion with production upgrades, and adapts to high-interference workshop environments.
Energy Management: Combined with ME31 temperature acquisition modules and MA01 digital I/O modules, it realizes busbar temperature monitoring, switch status collection and energy consumption statistics in distribution rooms. The standard Modbus protocol is compatible with mainstream energy management systems, reducing wiring and construction costs for multi-point acquisition.
Remote Environmental Telemetry: M31 LoRa wireless I/O or E860-DTU 4G remote I/O enables wiring-free deployment in field hydrology and meteorology monitoring sites without wired networks. The LoRa version delivers 10km line-of-sight transmission, while the 4G version has no distance limit; both feature wide temperature range and low power design for solar power supply.
Building Automation: MA01 series serial I/O modules can be deployed floor by floor to integrate lighting, access control and fire signals into the building control system. For old building renovation, LoRa wireless I/O avoids cross-wall wiring and greatly shortens the construction period.
PLC Extension: The full range of remote I/O supports mainstream protocols including Profinet and Modbus TCP/RTU, and is directly compatible with Siemens, Mitsubishi and other mainstream PLCs. It flexibly expands digital, analog and temperature channels at a much lower cost than original brand expansion modules, with no need to replace the PLC host.

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Frequently Asked Questions

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We are a manufacturer with sufficient stock. We will ship immediately after payment. We use China Post Air Freight and the goods will arrive within 5-7 working days at the fastest. We provide the full set of certification certificates you need to help you complete customs clearance quickly.

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Tel: +86-028-61543675
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Email: ebyteiot@cdebyte.com
Address: Buildings B2 and B5, No. 199, West District Avenue, High-tech West District, Chengdu, Sichuan Province.

What is the product performance?

ebyte’s wireless module provides a 365-day worry-free warranty, and high-quality product performance does not require worrying about after-sales problems.

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Remote I/O Modules

Why Engineers Choose Ebyte Remote I/O Modules

Ebyte Remote I/O Products Selection Guide

1. Product Line Overview & Screening Logic

2. Detailed Parameter Comparison Tables

Table 1: MA01 Series – Entry-level RS485 Modbus RTU Remote I/O

Table 2: ME31 Series – Compact Specialized Remote I/O

Table 3: M31 Series – High-performance Distributed Remote I/O

3.1 Modbus TCP/RTU Version

3.2 Industrial Bus Versions

3.3 LoRa Wireless Distributed I/O

Table 4: Wireless Remote Synchronous I/O (Signal Remote Transmission)

3. Quick Selection Steps

Applications

0.01$ Sample Module

New product promotion (up to 20% off)

China IoT Module/Modem Retailers

Corporate Culture

Internet of Things Exhibition Hall

office

Factory

Factory

Factory

Large Stock

Large Stock

IoT Exhibition

IoT Exhibition

IoT Exhibition

IoT Exhibition

Blog posts

Frequently Asked Questions

FREE SHIPPING

SUPPORT 24/7

30 DAYS RETURN

100% PAYMENT SECURE

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