The Schneider Electric (Telemecanique) Twido TWDAM01HT is an analog output expansion module for the legacy Twido PLC system. This module is essential when you need the PLC to control devices that require a variable signal rather than a simple on/off command, such as speed controllers for motors or proportional valves.
1. Function and Output Configuration
The TWDAM01HT provides one single analog output channel. This channel is highly versatile because it can be configured for either voltage or current signals depending on the requirements of your actuator.
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Number of Outputs: 1 Channel.
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Signal Ranges:
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Voltage: $0$ to $10\text{V}$ DC.
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Current: $4$ to $20\text{mA}$.
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Resolution: 12-bit ($0$ to $4095$ digital steps). This allows for very smooth control of external devices.
2. Technical Specifications
| Feature | Details |
| Model Number | TWDAM01HT |
| Output Impedance | Voltage: $\geqslant 1 \text{ k}\Omega$ / Current: $\leqslant 500\Omega$ |
| Total Error | $\pm 0.2\%$ of full scale at $25^\circ\text{C}$ |
| Settling Time | $10\text{ ms}$ |
| External Power | 24V DC (Required for the analog conversion circuitry) |
| Isolation | Photocoupler isolation between the output and internal logic |
3. Wiring and Connection
The module uses screw terminals for field wiring. Because analog signals are susceptible to electromagnetic interference (EMI), proper wiring is critical for accuracy:
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Shielding: Always use shielded twisted-pair cables for the output signal. Connect the shield to a functional earth (FE) ground at one end only.
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Power Supply: You must connect an external 24V DC power source to the module terminals (usually labeled $L+$ and $M$ or $+$ and $-$). Without this external power, the analog output will remain at $0$ regardless of the PLC program.
4. Key Advantages
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Precision Control: The 12-bit resolution means that for a $0$–$10\text{V}$ signal, you can adjust the output in increments as small as $2.44\text{ mV}$.
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Diagnostic LEDs: Includes a status LED that indicates if the module is receiving power and communicating correctly with the Twido base controller.
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Compact Design: Like most Twido modules, it is very slim, saving valuable space on the DIN rail.
5. Programming and Configuration
To use the TWDAM01HT, you must configure the “I/O Configuration” in your programming software (TwidoSuite or EcoStruxure Machine Expert – Basic):
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Select the module from the catalog and add it to your PLC rack.
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Choose the Output Type (Voltage or Current) in the software settings.
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The output is mapped to a specific memory word (e.g.,
%QW0.1.0). To change the output signal, you simply write a value between $0$ and $4095$ to that word in your ladder logic.
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