4 Digital Input to RS485

Remote I/O

RS485-based with Modbus RTU protocol for easy integration with PLC, SCADA, and HMI systems.
4 optically isolated digital inputs for reliable signal acquisition from multiple sources.
Supports half-duplex communication with cost-effective two-wire connectivity.
Offers robust communication, strong isolation, and industrial-grade reliability.
Ideal for input monitoring in factory automation, building control, and distributed systems.

Description

The 4-Digital Input to RS485 Remote I/O Module is a input acquisition device designed for monitoring multiple digital signals in industrial automation systems. It supports Modbus RTU protocol over RS485 communication, enabling seamless integration with PLCs, SCADA, HMI, and DCS systems.

With 4 optically isolated digital inputs, the module is ideal for monitoring switches, sensors, limit sensors, proximity sensors, and dry contact devices in real-time. It supports half-duplex communication with cost-effective two-wire connectivity, making it suitable for distributed monitoring applications.

This device provides robust communication, strong electrical isolation, and industrial-grade reliability, making it suitable for factory automation, energy management, building control, and input monitoring 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 (115mm 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

Input

Channels	4
Contact Rating	24 VDC Sink/source (isolated) Upto 5000 VRMS for 1 minute
Standard	Optoisolated

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

4 Optically Isolated Digital Inputs

Input channels for monitoring multiple signals.

Modbus RTU Protocol

Industry-standard protocol for seamless PLC and SCADA integration.

RS485 Communication

Half-duplex two-wire connectivity for cost-effective installations.

Optical Isolation

Protects against electrical noise and ground loops.

High-Speed Communication

Fast response time for real-time monitoring applications.

Industrial-Grade Design

Rugged construction for harsh industrial environments.

Wide Power Supply Range

9–24VDC supports flexible field installation.

DIN Rail Mountable

Easy installation in standard control panels.

Functional Description

Digital Input Channels can detect switch states, limit sensors, proximity sensors, or dry contact devices with optical isolation for noise immunity.

Modbus RTU Communication enables standard protocol-based data exchange with PLCs, SCADA systems, and HMI devices over RS485.

Optical Isolation provides electrical isolation between input circuits and the communication interface, protecting against voltage spikes and ground loops.

Status Indication provides visual feedback through LED indicators for power and communication status monitoring.

Configuration and Monitoring can be performed via Modbus RTU commands, allowing remote setup and real-time status monitoring of all 4 input channels.