Minimal Example IP20 EC DI8 DO8

A complete software walkthrough for the Elrest IP20-EC-DI8-DO8

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Table of Contents

1. Introduction
2. Requirements
3. Hardware Setup
4. Software Setup
5. Demo
6. References
7. Software Architecture

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1. Introduction

The IP20-EC-DI8-DO8 Minimal Example demonstrates how to control and monitor digital I/O on a Elrest IP20-EC-DI8-DO8 EtherCAT Fieldbus Controller using the QiTech machine framework.

The device provides:

• 8 digital outputs (DO1–DO8) — controllable from the dashboard
• 8 digital inputs (DI1–DI8) — readable in real time

Unlike Beckhoff EtherCAT terminal stacks (which require an EK1100 bus coupler), the Elrest IP20-EC-DI8-DO8 is a standalone EtherCAT device that connects directly to the EtherCAT master.

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2. Requirements

Hardware

• Elrest IP20-EC-DI8-DO8 EtherCAT Fieldbus Controller
  • Vendor ID: 0x741
  • Product ID: 0x117b6722
  • Revision: 0x1
• 24 V DC power supply
• Linux PC as EtherCAT master
• Standard Ethernet cable
• Wiring tools and appropriate conductors

Software

See Device Example Basics for software prerequisites.

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3. Hardware Setup

3.1 Overview

The Elrest IP20-EC-DI8-DO8 combines a fieldbus coupler and I/O in a single unit. It connects directly to your Linux PC via Ethernet and requires a 24 V DC power supply.

3.2 Power Wiring

The device requires 24 V DC on its power terminals. Refer to the official Elrest documentation for the exact terminal layout of your hardware revision.

⚠️ Always disconnect power before wiring. See Device Example Basics for the safe wiring procedure.

3.3 Digital Outputs (DO1–DO8)

The 8 digital outputs switch 24 V DC loads. Connect the load between the corresponding output terminal and the 0 V (GND) reference terminal.

3.4 Digital Inputs (DI1–DI8)

The 8 digital inputs sense 24 V DC signals. Connect the signal source between the corresponding input terminal and the 0 V (GND) reference.

3.5 Ethernet

Use a standard LAN cable to connect your PC directly to the EtherCAT (X1) port of the IP20-EC-DI8-DO8.

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4. Software Setup

See Device Example Basics to install and run the software, then return here for the device-specific demo steps.

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5. Demo

5.1 Assigning Devices in the Dashboard

Once the backend and frontend are running, the IP20-EC-DI8-DO8 will appear in the device discovery view.

Steps:

1. Click Assign on the IP20-EC-DI8-DO8
2. Select IP20 Test V1 as the machine type
3. Enter a serial number
4. Click Write

5.2 Using the Control Interface

Navigate to Machines → IP20 Test.

The control page has four panels:

Panel	Description
Digital Outputs	Toggle each of the 8 outputs (DO1–DO8) individually between On and Off
Digital Inputs	Live view of each of the 8 inputs (DI1–DI8), displayed as HIGH or LOW
Master Output Control	Turn all 8 outputs On or Off simultaneously

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6. References

(SoonTM)

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7. Software Architecture

Backend (Rust)

Located in machines/src/ip20_test_machine/.

File	Description
mod.rs	Defines IP20TestMachine struct; holds 8-element arrays for inputs, outputs, digital input (dins) and output (douts) HAL wrappers
new.rs	Initializes the IP20EcDi8Do8 device, creates DigitalInput / DigitalOutput wrappers for all 8 channels
api.rs	Handles SetOutput { index, on } and SetAllOutputs { on } mutations; emits StateEvent (outputs) and LiveValuesEvent (inputs) via Socket.IO
act.rs	Real-time loop: reads inputs, emits state at 30 Hz, emits live values at 10 Hz

The HAL device driver is located in ethercat-hal/src/devices/wago_modules/ip20_ec_di8_do8.rs.

Frontend (TypeScript/React)

Located in electron/src/machines/ip20testmachine/.

File	Description
useIP20TestMachine.ts	Custom hook; manages optimistic state and sends SetOutput / SetAllOutputs mutations to the backend
IP20TestMachineControlPage.tsx	UI with output toggle controls, live input badges, master on/off, and input summary
ip20TestMachineNamespace.ts	Socket.IO namespace handler; updates the Zustand store with incoming StateEvent and LiveValuesEvent messages