Minimal Example Wago 750 553
The WAGO 750-553 Analog Output Example demonstrates how to drive 4 independent current outputs (0–20 mA) from a WAGO 750-553 EtherCAT module using the QiTech machine framework. Each channel can be set individually or all at once via sliders in the QiTech Control Dashboard. The module outputs a DC current signal proportional to the set value, making it suitable for controlling actuators, valves, or other 0–20 mA devices.
- WAGO 2787-2144 EtherCAT
- WAGO 750-354 EtherCAT Coupler
- WAGO 750-602 EtherCAT Power Terminal
- WAGO 750-553 EtherCAT Terminal (4-Channel Analog Output, 0–20 mA)
- WAGO 750-600 EtherCAT Endmodule
- WAGO 852-1322 Ethernet-Switch
- 24V DC Lab power supply (AC/DC adapter)
- Load resistor or test device (0–300 Ω or 300–600 Ω, same impedance across all channels) for verifying the output
- A Linux PC (Ubuntu/Debian recommended)
- Standard Ethernet cable
- Flat screwdriver
See Device Example Basics for software prerequisites.
⚠️ Always disconnect power before wiring. See Device Example Basics for the safe wiring procedure.
The WAGO 750-553 is a 4-channel analog output module that generates 0–20 mA DC current signals. Each channel uses a 2-wire actuator connection with 8 CAGE CLAMP® terminals in total. The module has a green function LED (A) and a red error LED (B). It requires a 24 VDC field-side supply voltage via the power jumper contacts in addition to the 5 VDC system supply through the backplane.
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-
Wire the 750-354 EtherCAT Coupler to the power supply:
- Red wire (+24V)
- Yellow wire (0V)
Slide the 750-602 EtherCAT Power Terminal onto the right side of the 750-354 Coupler until it locks.
Perform the following wiring steps:
- Green wire (Ground) → Terminal 4
- 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
Slide the 750-553 EtherCAT Terminal onto the right side of the 750-602 EtherCAT Power Terminal until it locks.
The terminal receives its system power (5 VDC) through the backplane data contacts. The field-side supply (24 VDC) is provided via the power jumper contacts from the 750-602 — no additional power wiring on the 750-553 is required.
The 750-553 has 4 analog output channels. Each channel requires two terminals for the load:
Channel 1 (AO1):
- Terminal 1: ⊕ Output (+)
- Terminal 5: ⊖ Output (−)
Channel 2 (AO2):
- Terminal 2: ⊕ Output (+)
- Terminal 6: ⊖ Output (−)
Channel 3 (AO3):
- Terminal 3: ⊕ Output (+)
- Terminal 7: ⊖ Output (−)
Channel 4 (AO4):
- Terminal 4: ⊕ Output (+)
- Terminal 8: ⊖ Output (−)
For this minimal example, connect a load resistor or test device to at least one channel:
- Wire load (+) to Terminal 1 (Channel 1 positive output)
- Wire load (−) to Terminal 5 (Channel 1 negative output)
Repeat for additional channels as needed.
⚠️ The load impedance must be either 0–300 Ω or 300–600 Ω, and must be the same value across all connected channels. Exceeding 600 Ω may cause incorrect output levels.
Slide the 750-600 EtherCAT Endmodule onto the right side of the 750-553 EtherCAT Terminal until it locks.
No further wiring is required.
Connect the 2787-2144 power supply to the power outlet.
Use a standard LAN cable to connect your PC → 852-1322 Ethernet-Switch And another from 852-1322 Ethernet-Switch → 750-354 EtherCAT Coupler
See Device Example Basics to install and run the software, then return here for the device-specific demo steps.
Once the backend + frontend are running, you should see:
- WAGO750-354 (Coupler)
- WAGO750-553 (4CH AO)
Steps:
- Click Assign on the 750-354 module
- Select "Wago 750-553 AO Test V1"
- Enter a serial number other than 0
- Keep the device role unchanged if it is set to "Wago 750-354 Bus Coupler"
- Repeat these steps for the 750-553 module using the same non-zero serial number
- Finally, restart the Backend process
In the left sidebar, WAGO 750-553 4CH AO should appear. Click it.
You will see two control cards:
Each channel shows a slider and a live readout:
- The label displays the channel name, the current percentage, and the milliamp value (e.g., AO1 — 50.0% · 10.00 mA)
- Drag the slider to set the output value between 0 mA (0%) and 20 mA (100%)
- The slider has 0.1% precision (step size 0.001)
- Values are applied to the hardware when the slider is released
A quick-set bar with two options:
- All 0% — sets all 4 channels to 0 mA
- All 100% — sets all 4 channels to 20 mA
The WAGO 750-553 provides:
- Signal Type: 0–20 mA DC current output
- Resolution: 12 bits
- Conversion Time: 10 ms (typical)
- Output Error: ≤ 0.1 % of upper-range value (at 25 °C reference)
- Temperature Error: ≤ 0.01 %/K
- Recovery Time: 100 ms (typical)
- Load Impedance: 0–300 Ω or 300–600 Ω (same across all channels)
- Isolation: 500 V system/field
- 4 Independent Channels: Each can be controlled separately
The module has two LEDs:
- LED A (green): Function indicator — lit during normal operation
- LED B (red): Error indicator — lit when a fault is detected
If the red error LED is active:
- Check that the load impedance is within the specified range (0–600 Ω)
- Verify the 24 VDC field-side supply is present and within tolerance (−25 … +30 %)
- Ensure all wire connections are secure
- Minimal Example — Wago 750-460 (4-channel analog input, Pt100 RTD)
- Minimal Example — Wago 750-455 (4-channel analog input, 4-20mA)
- Minimal Example — Wago 750-530 (8-channel digital output)