Resources:
Wiki: www.waveshare.com/wiki/Modbus_RTU_IO_8CH
Industrial 8-Channel Modbus RTU DC 7~36V Input & Output Module
The Industrial 8-Channel Modbus RTU DC 7~36V Input & Output Module is a high-reliability, isolated digital I/O module designed for industrial automation, monitoring, and control systems. Featuring 8 isolated digital inputs and 8 isolated digital outputs, this module communicates via an RS485 interface using the Modbus RTU protocol, enabling seamless integration with PLCs, SCADA systems, and other industrial controllers. Built with robust protection features such as power isolation, magnetic isolation, resettable fuses, and TVS surge suppression, the module ensures long-term stability and safety in harsh industrial environments. It supports both active and passive digital input modes, with bi-directional optocoupler isolation and an internal debouncing algorithm for reliable signal reading.
The digital outputs utilize Darlington transistors with optocoupler isolation and flyback diode protection, capable of sinking up to 500mA per channel. The module also includes a flash-on/flash-off function, enabling automatic pulse control via Modbus commands. With a DIN-rail mountable case, wide 7–36V DC input range, and cascading capability (up to 255 device addresses), it offers flexibility, scalability, and easy installation for industrial automation systems.
Key Features
- 8DI / 8DO Digital I/O Module:
Provides 8 optically isolated digital inputs and 8 isolated digital outputs with strong anti-interference capability.
- RS485 Modbus RTU Communication:
Supports standard Modbus RTU protocol for easy integration with PLCs, SCADA, and HMIs.
- Wide Power Supply Range:
Operates on 7–36V DC with onboard voltage regulation for stable performance.
- Isolated Power and Signal Design:
Features unibody power and magnetic isolation for high reliability and electrical safety.
- Protection Circuits Built-In:
Includes resettable fuse and TVS for surge suppression, overvoltage, and lightning protection.
- Flexible Input Configuration:
Supports both passive and active digital inputs with built-in debouncing for accurate detection.
- High-Current Output Capability:
Darlington transistor outputs can sink up to 500mA per channel with flyback diode protection.
- Smart Control Features:
Supports flash-on/flash-off timing control and linkage between DI and DO channels.
- Cascadable Design:
Configurable address (1–255) allows multiple modules to be connected over a single RS485 bus.
- DIN-Rail Mountable Case:
Rugged industrial design supports rail mounting and stacking for easy installation.
- Status Indication:
Multiple onboard LEDs indicate input, output, MCU, and communication status in real-time.
8-ch Digital Input & Output Module
Primary Function
Modbus RTU protocol commands can be sent via RS485 to receive digital input and operate digital outputs.
Interface
Multiple Modes For Various Automation Scenarios
Dimensions
Package Content:
