8-channel Modbus RTU input/output module DC 7-36 V

Industrial 8DI/8DO module with signal isolation, RS485 interface and Modbus RTU protocol

The industrial digital input/output module (8DI / 8DO) is designed for demanding applications in industrial environments. With built-in power and signal isolation, a wide supply voltage range (7-36 V DC) and Modbus RTU protocol compatibility, it provides high reliability and noise immunity.

Key features of the module:

• 8 Outputs with full isolation
• Modbus RTU protocol support via RS485
• Support for passive (NPN) and active (PNP) inputs
• Outputs based on Darlington transistors (up to 500 mA)
• TVS protection, self-resetting fuses and reverse polarity protection diode
• Compact housing suitable for standard 35 mm DIN rail
• Remote control of outputs (flash-on/off modes)
• Contact vibration suppression algorithm
• DI/DO modes: automatic (linkage control) and manual (toggle control)

Pinout and signal description

Example of application

Internal design

Built-in double isolation of power supply and signal for RS485 communication. Built-in TVS suppresses surges, providing protection against lightning and ESD. Built-in resettable fuse and protection diode guarantee stable current and voltage output, offering protection against current overload and surges.

DIN rail mounting 35mm

Dimensions

Specifications

• Communication interface: RS485
• Transmission speed: 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000
• Default communication format: 9600, N, 8, 1
• Modbus protocol: Standard Modbus RTU protocol
• Power supply: DC 7~36V
• Digital input:
  • 8 inputs (8DI), range 5~36V
  • Passive/active input (NPN or PNP)
  • Built-in bidirectional optoisolator
• Digital output: 8 outputs (8DO), range 5~40V, open-drain output, maximum load 500 mA/channel
• Device address range: 1~255 (default: 1, corresponding to hexadecimal value 0x01)

Set contents

Wiki: https://www.waveshare.com/wiki/Modbus_RTU_IO_8CH