6.1 KiB
Minimal Example — LED Control on the WAGO750-402
A complete hardware + software walkthrough
Table of Contents
1. Introduction
The WAGO 750-402 Display Example is a minimal demonstation showing how to display the digital inputs on a WAGO 750-402 EtherCAT terminal using the QiTech machine framework. It represents the simplest possible hardware interaction in the system: Displaying the Digital Inputs using the QiTech Control Dashboard.
2. Requirements
Hardware
- WAGO 2787-2144 EtherCAT
- WAGO 750-354 EtherCAT Coupler
- WAGO 750-602 EtherCAT Power Terminal
- WAGO 750-402 EtherCAT Terminal (4.channle digital input)
- WAGO 750-600 EtherCAT Endmodule
- WAGO 852-1322 Ethernet-Switch
- 24V DC Lab power supply(AC/DC adapter)
- A Linux PC (Ubuntu/Debian recommended)
- Standard Ethernet cable
- Flat screwdriver
Software
(Installation steps in Section 4)
- Rust tollchain
- Node-js + npm
- Git
- QiTech Control repository
- EtherCAT HAL (include inside repo)
3. Hardware Setup
3.1 Schematic
⚠️ Safety Warning
Always disconnect power before wiring.
Working on live EtherCAT terminals can cause serious damage or electrical shock.
3.2.1 Safe Wiring Procedure (Beckhoff Recommended)
- Insert a screwdriver straight into the square release hole.
- Insert the stripped wire into the round opening.
- Remove the screwdriver — the spring clamp locks the wire.
3.2.2 Wiring Steps (Used in This Example)
We supply power to the other devices by using the 750-602 EtherCAT Power Terminal
Perform the following wiring on the Ethernet-Switch:
- Red wire (+24V) → PWR+
- Black wire (0V) → RPS-
Figure 1 —
3.3 WAGO Wiring the Coupler
Wire the 750-354 EtherCAT Coupler to the power supply
- red wire (+24V)
- yellow (0V)
Figure 2 —
3.4 750-602 EtherCAT Power Terminal Integration
Slide the 750-602 EtherCAT Power Terminal onto the right side of the 750-354 Coupler until it locks.
Next We need to wire the EtherCat Power Terminal
Perform the next wiring Steps:
- Green wire (Ground) → Terminal4
- Red wire (+24V) from 750-602 EtherCAT Power Terminal → Terminal 2
- Black wire(0V) from 750-602 EtherCAT Power Terminal → Terminal 3
- Red wire (+24V) from 750-354 EtherCAT Coupler → Terminal 6
- Yellow wire (0V) from 750-354 EtherCAT Coupler → Terminal 7
Figure 3 — Wiring
3.5 750-402 EtherCAT Terminal Integration
Slide the 750-402 EtherCAT Terminal onto to right side of the 750-602 EtherCAT Power Terminal until it locks.
Wire from the 24V DC Lab Adapter → Terminal 1
Figure 4 — Wiring
3.6 750-600 Final Assemly
Slide the 750-600 EtherCAT Endmodule onto to right side of the 7750-402 EtherCAT Terminal until it locks.
No wiring is required
Figure 5 — 750-402 + 750-600 Connected
3.7 Power & Etherneet
Power
Connect the 2787-2144 power supply to the power outlet
Ehternet
Use a standard LAN cable to connect to your PC → 852-1322 Ethernet-Switch
And another from 852-1322 Ethernet-Switch → 750-354 EtherCAT Coupler
Figure 6 — Ethernet
4. Software Setup
4.1 Installing on Ubuntu/Debian
Paste this into your terminal:
# Press Enter when prompted
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
sudo apt update
sudo apt install -y npm nodejs git
git clone git@github.com:qitechgmbh/control.git
cd control/electron
npm install
4.2 Running the Backend
./cargo_run_linux.sh
This script:
-
Builds the backend
-
Grants required system capabilities (raw sockets)
-
Starts EtherCAT communication
Ensure the WAGO750-402 is connected.
4.3 Running the Frontend
cd electron
npm run start
This launches the QiTech Control dashboard.
5. Demo
5.1 Assigning Devices in the Dashboard
Once the backend + frontend are running, you should see:
-
WAGO750-354 (Coupler)
-
wago module (Digital Input Terminal)
Steps:
-
Click Assign on the wago module
-
Select Digital Input Machine V1
- Enter a serial number except for 0
- Click Write
5.2 Diyplaying LED
Navigate to:
Machines → DigitalInputMachine
You will see this interface:
Now you can apply a Voltage of the Range of 15V-30V (+24V recommended) from the DC lab power supply to the Terminal. The Terminal can read the digital input, which is signaled by the LED on the Terminal and should be displayed in the Control software.
In our example it lights up the first LED
6. References
This guide incorporates information from official WAGO documentation. All diagrams, product names, and figures belong to Beckhoff Automation GmbH & Co. KG and are used here solely for educational purposes.
Referenced Manuals