Tyrrell Products


4DI 4DO Expansion Module – 4DI Pulse Counting On Board IP


Title Range Discount
Standard price 1 - 25 £170.00
Bulk discount 26 - 10000 £157.00

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4DI 4DO Expansion Module - 4DI Pulse Counting On Board IP

4DI 4DO Expansion Module – 4DI Pulse Counting On Board IP

The 4DI 4DO Expansion Module is designed for building automation systems, offering 4 digital inputs with pulse counting and 4 digital outputs. It features permanent memory storage for counter values and retains the last value during power failures. The module is user-friendly with easy configuration and status LEDs for all inputs, outputs, and communication. It connects via RS-485 as a Modbus RTU slave and has an option for IP connection for Modbus TCP. Configuration of the slave ID and baud rate is straightforward using DIP switches. This robust module enhances automation system functionality with reliable performance and convenient setup.


  • Expansion Module for Building Automation Systems
  • 4 Digital Inputs (Pulse Counter)
  • 4 Digital Outputs
  • Counter Value Stored in Permanent Memory.
  • Last Value Held in Memory During Power Failure.
  • User Friendly Configuration
  • Status LEDs for all Inputs, Outputs and Communication
  • RS-485 Connection as Modbus RTU Slave
  • Option for IP connection for Modbus TCP
  • Slave ID and Baud-rate Configured with DIP Switches


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