8AI 4DI Modbus RS485

Remote I/O

RS485-based with Modbus RTU protocol for easy integration with PLC, SCADA, and HMI systems.
8 analog inputs and 4 digital inputs for comprehensive signal acquisition.
Supports half-duplex communication with cost-effective two-wire connectivity.
Offers robust communication, strong isolation, and industrial-grade reliability.
Ideal for factory automation, process monitoring, and distributed data acquisition applications.

Description

The 8AI/4DI RS485 Remote I/O Module is an industrial I/O device designed for reliable analog and digital signal acquisition in distributed automation systems. It supports Modbus RTU protocol over RS485 communication, allowing easy integration with most PLCs, SCADA, HMI, and DCS systems.

With 8 analog inputs and 4 digital inputs, the module is ideal for monitoring sensors, transducers, switches, and other field devices in real-time. It supports half-duplex communication with cost-effective two-wire connectivity, making it suitable for legacy industrial systems.

This device provides robust communication, strong electrical isolation, and industrial-grade reliability, making it suitable for factory automation, process monitoring, energy management, and distributed data acquisition applications.

Specifications

Input Power	Unregulated 9 – 24 VDC
Power Consumption	Less than 1 W @ 12 VDC
Protections	Reverse Polarity, Overvoltage (+/-35 VDC), Short Circuit, Transient Voltage, TVS/ESD
Indication	Power (Red), Status (Green)
Connector	5mm pitch screw terminal blocks
Enclosure	ABS Enclosure
Installation Type	Plug and Play
Dimensions	Modular Architecture (145mm x 90mm x 40mm)
Warranty	12 Months from date of installation or 18 Months from date of delivery (whichever is earlier)*

Data Connectivity

Connectivity Supported	RS485
Protocol Supported	Modbus RTU
Communication Interface	2 Wire Type
Watchdog Timer	System (5 Sec) and Communication
Indication	Green for Communication Status

Analog Input

Channels	8
Contact Rating	4-20 mA with 12 bit SAR ADC (Transient Protected) (80 dB CMRR)
Standard	Single ended 12 bit ADC

Digital Input

Channels	4
Contact Rating	24 VDC Sink/source (isolated) Upto 5000 VRMS for 1 minute
Standard	Digital Isolator type IEC 60950

Environment

Operating Temperature	0 to 65° C
Storage Temperature	-10 to 70° C
Operating Humidity	5 – 95% RH (non-condensing)

Mounting

Built Architecture	Modular
Mounting	DIN Rail Mountable, Wall Mountable, Stack Mountable
Installation	Plug and Play Device

Key Features

8 Analog Inputs

Support voltage and current input signals for sensor monitoring.

4 Optically Isolated Digital Inputs

Support source type connections for reliable signal acquisition.

Modbus RTU over RS485

Standard industrial protocol for easy integration with control systems.

Two-Wire Half-Duplex Communication

Cost-effective connectivity with simple two-wire installation.

Multi-Drop Network Support

Connect multiple devices on a single RS485 bus network.

Watchdog Timer & Fail-safe Protection

Maintain system stability in communication loss scenarios.

Wide Power Supply Range

9–24VDC supports flexible field installation.

DIN Rail / Wall Mount Design

Compact and rugged industrial housing for versatile installation.

Functional Description

Analog Input Channels can measure voltage (0-10V) or current (4-20mA) signals from sensors, transducers, and other analog devices.

Digital Input Channels can detect switch states, limit sensors, proximity sensors, or dry contact devices.

RS485 Communication enables reliable data transmission over long distances using Modbus RTU protocol.

Watchdog Function automatically resets outputs to safe states if communication is lost.

Configuration Tool provides an intuitive interface for setting Modbus address, I/O mode, and monitoring signal status.

Applications

Analog sensor monitoring with digital inputs via Modbus RS485

SCADA system integration with analog and digital I/O

Process control with analog sensors and digital status

Energy monitoring with analog inputs and digital status

Smart factory analog and digital I/O integration

Water treatment analog monitoring and digital status

HVAC and environmental monitoring

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