Purchase now: Wago 750-554 Analog Output Module
Purchase now: Atlantech Drives provides you the Wago 750-554, a precision **Analog Output Module** for the Wago 750 series. This unit generates two independent standard **4 to 20 mA** current signals. It is essential for controlling field actuators such as proportional hydraulic valves, variable frequency drive (VFD) speed setpoints, or analog displays. The output signal is electrically isolated from the system bus, ensuring signal integrity.
Technical Specifications and Load Capacity
The 750-554 offers a high resolution of **12 bits**, ensuring smooth control steps. It draws power for the output signal from the power jumper contacts (24V field supply). It can drive loads up to **600 Ohms**, which is sufficient for most industrial actuators and long cable runs. The module is short-circuit proof, protecting the output electronics if a technician accidentally shorts the wires.
- Part Number: 750-554.
- Channels: 2 Analog Outputs.
- Signal Type: 4…20 mA.
- Load Impedance: Max 600 Ω.
- Resolution: 12 bits.
- Conversion Time: ~2 ms.
- Isolation: 500 V (Bus/Output).
- Power Consumption: Field supply required.
Expert Maintenance Advice: Impedance Matching
A common issue is «signal saturation». Expert Tip: If your actuator is not reaching 100% (20mA) even when the PLC commands it, check the total resistance of the loop. The 750-554 can drive up to 600 Ohms. If you daisy-chain three devices (e.g., a local display + a chart recorder + a valve positioner) on one output channel, the total resistance might exceed 600 Ohms. In this case, the voltage (24V) is insufficient to push 20mA through the loop. You will need a signal splitter.
Frequently Asked Questions (FAQs)
Q: Can I use this for 0-20mA?
A: Functionally, 4-20mA is a subset of 0-20mA range hardware, but the scaling in the PLC depends on the configuration bytes. The 750-554 is specifically optimized for 4-20mA with defined error states.
Q: What happens if the PLC stops?
A: The module can be configured (depending on the coupler) to hold the last value or drop to a safe state (e.g., 0mA or 4mA) in case of fieldbus failure.
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