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- TM2AVO2HT
- Analog Output Module
- France
- 90 × 23.5 × 70 mm
- 0.085 kg
- Xiamen, China
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Product Overview
The Schneider Electric TM2AVO2HT is an analog output expansion module for the Modicon M238 logic controller. It provides two voltage output channels for transmitting analog control signals from the controller to external equipment, including proportional actuators, variable-speed drives, and other devices requiring voltage-based references.
The module belongs to the Modicon TM2 analog expansion range and uses a removable screw terminal block for field wiring. Both output channels support a bipolar voltage range of -10 to +10 V DC, allowing the controller to generate analog reference signals for equipment requiring bidirectional or adjustable voltage control.
The TM2AVO2HT uses an 11-bit resolution plus sign, giving it the ability to represent positive and negative output values. Its photocoupler-based insulation separates the I/O circuits from the internal logic, helping protect the controller-side electronics from electrical disturbances originating in connected field circuits.
The module is suitable for Modicon M238 automation systems requiring additional analog output capability. It can also be used in compatible Advantys OTB and Twido configurations, subject to the applicable system architecture.
For machine control applications, the TM2AVO2HT is particularly useful when a PLC must convert programmed control values into voltage references for external equipment. Typical examples include proportional positioning, process regulation, and analog speed reference control.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Model | TM2AVO2HT |
| Product Series | Modicon TM2 |
| Product Type | Analog Output Module |
| Compatible Controller | Modicon M238 |
| Range Compatibility | Advantys OTB, Twido |
| Number of Analog Outputs | 2 |
| Analog Output Type | Voltage |
| Output Range | ±10 V DC |
| Output Resolution | 11 bits + sign |
| LSB Value | ±9.8 mV |
| Load Type | Resistive |
| Minimum Load Impedance | 3,000 Ω |
| Stabilization Time | 2 ms |
| Conversion Time | 2 ms + 1 controller cycle |
| Measurement Error | ±0.5% FS at 25°C |
| Repeat Accuracy | ±0.1% FS |
| Non-Linearity | ±0.2% FS |
| Total Error | ±1% FS |
| Output Ripple | ≤1 LSB |
| Rated Supply Voltage | 24 V DC |
| Supply Voltage Range | 19.2–30 V DC |
| Internal Current Consumption | 60 mA at 5 V DC |
| External Current Consumption | 60 mA at 24 V DC |
| Electrical Connection | 1 removable screw terminal block |
| Signal Cable | Twisted shielded cable |
| Channel-to-Logic Isolation | Photocoupler |
| Dielectric Strength | 2,500 V between I/O and internal logic |
| Dimensions | 90 × 23.5 × 70 mm |
| Weight | 0.085 kg |
Product Features
- Two Analog Voltage Outputs: Provides two independent voltage output channels for external equipment control.
- Bipolar Output Range: Supports -10 to +10 V DC signals for applications requiring positive and negative reference values.
- 11-Bit Resolution Plus Sign: Provides 2,048 positive and 2,048 negative output levels, with an additional sign bit.
- Photocoupler Isolation: Provides electrical insulation between the I/O circuits and internal controller logic.
- Removable Screw Terminal: Simplifies field wiring, module replacement, and electrical connection inspection.
- 24 V DC External Supply: Operates with a rated external supply of 24 V DC, within a specified range of 19.2–30 V DC.
- Fast Signal Stabilization: Features a 2 ms stabilization time for analog output signals.
- Twisted Shielded Cable Support: Uses shielded wiring to help reduce electrical interference in industrial environments.
- Modicon Expansion Compatibility: Integrates into the Modicon M238 analog expansion architecture.
Product Working Principle
The TM2AVO2HT converts digital control values generated by the Modicon M238 controller into analog voltage signals for external equipment.
During operation, the PLC executes its programmed control logic and calculates the required output value based on process measurements, operator commands, or internal control algorithms.
The resulting digital value is transferred to one of the module’s two output channels. The TM2AVO2HT converts this value into a corresponding bipolar voltage signal within the -10 to +10 V DC operating range.
For example, a controller can use one output channel to generate a voltage reference for a variable-speed drive. As the programmed reference changes, the module adjusts its output voltage accordingly, allowing the drive to regulate motor speed.
The module also supports negative voltage references. This is useful in applications where external equipment interprets positive and negative voltage values as different operating directions or control conditions.
A simplified signal arrangement is:
Modicon M238 PLC → TM2AVO2HT → Analog Voltage Signal → External Drive / Proportional Actuator
Each channel operates independently, allowing two separate analog reference signals to be generated. The removable screw terminal block provides the electrical connection between the module and the external equipment.
The photocoupler provides isolation between the I/O circuits and internal logic. This separation helps prevent electrical disturbances on the field side from directly affecting the controller’s internal logic circuits.
Correct channel configuration is essential. The physical wiring must match the voltage output mode configured in the PLC software. Incorrect signal configuration can result in improper operation or damage to the analog circuit.
Role in Schneider Modicon M238 Control Architecture
Within the Modicon M238 architecture, the TM2AVO2HT functions as an expansion module for analog output signal generation.
The M238 controller handles program execution, process calculations, and equipment control decisions. The TM2AVO2HT receives the corresponding digital output values and converts them into voltage references for connected field equipment.
Its two-channel configuration is particularly useful when a machine requires separate analog commands for different actuators or control devices.
A typical control arrangement is:
Sensors / Operator Commands → Modicon M238 PLC → TM2AVO2HT → Analog-Controlled Equipment
| System Component | Function |
|---|---|
| Modicon M238 PLC | Executes control logic and calculates output values |
| TM2AVO2HT | Generates two bipolar analog voltage outputs |
| Analog Input Modules | Acquire process measurement signals |
| Variable-Speed Drives | Receive analog voltage speed references |
| Proportional Valves | Use analog references for flow or pressure regulation |
| Servo Equipment | Receives compatible analog command signals |
| Operator HMI | Provides machine commands and operating parameters |
| Field Sensors | Supply process feedback to the controller |
The module’s output channels can be assigned to different control functions, provided the connected equipment supports the specified voltage range and electrical characteristics.
Industrial Applications
The TM2AVO2HT is suitable for machinery and process control systems requiring two analog voltage reference signals from a Modicon M238 controller.
| Industrial Application | Typical Use |
|---|---|
| Variable-Speed Motor Control | Providing voltage references to compatible motor drives |
| Packaging Machinery | Controlling proportional positioning and adjustable machine functions |
| Material Handling | Generating analog references for speed and positioning equipment |
| Process Automation | Regulating process variables through voltage-controlled devices |
| Water Treatment | Providing control references for compatible pumps and actuators |
| HVAC Systems | Sending analog commands to compatible ventilation and control equipment |
| Chemical Processing | Supporting voltage-based process regulation |
| Manufacturing Equipment | Controlling external devices requiring bipolar voltage signals |
| Machine Tool Automation | Providing analog reference signals for compatible equipment |
| Industrial Pump Systems | Supporting adjustable speed and proportional control functions |
Installation and Maintenance
- Verify Controller Compatibility: Confirm that the TM2AVO2HT is intended for the installed Modicon M238 or another supported system configuration.
- Inspect the Module: Check the housing, terminal block, connector contacts, and mounting clips for visible damage before installation.
- Check Output Requirements: Verify that the connected equipment accepts a bipolar voltage signal within the -10 to +10 V DC range.
- Isolate the Power Supply: Disconnect the relevant controller and external power supplies before installing or removing the module.
- Prepare the Mounting Position: Identify the designated TM2 expansion module position and confirm that the mounting arrangement is suitable.
- Install the Module: Mount the TM2AVO2HT according to the controller’s expansion module installation instructions and ensure that the mechanical connection is secure.
- Connect the External Supply: Verify the 24 V DC supply connection and confirm that the voltage remains within the specified operating range.
- Wire the Analog Outputs: Connect the two output channels using suitable twisted shielded cables and follow the terminal assignment diagram.
- Check Load Impedance: Confirm that the connected resistive loads meet the specified minimum impedance of 3,000 Ω.
- Configure Output Channels: Set the corresponding PLC output channels to the correct voltage operating mode and verify that software settings match the physical wiring.
- Perform Signal Testing: Use a calibrated multimeter to check the output voltage of each channel at different programmed reference values.
- Complete Routine Inspection: Inspect terminal connections, cable shielding, supply voltage, and output signal stability during scheduled maintenance.
When an output channel does not produce the expected voltage, check the PLC output configuration, external supply, terminal wiring, and connected load before replacing the module.
Particular attention should be paid to the voltage configuration. Schneider’s programming documentation warns that configuring a channel for current output when it is physically wired for voltage operation can damage the analog circuit.
Compatible System Components
| Component | Function |
|---|---|
| Schneider TM238LFAC24DR | Modicon M238 Logic Controller |
| Schneider TM238LFDC24DT | Modicon M238 Logic Controller |
| Schneider TM2AMO1HT | Single-Channel Analog Output Module |
| Schneider TM2AMI2HT | Two-Channel Analog Input Module |
| Schneider TM2AMI4LT | Four-Channel Analog Input Module |
| Schneider TM2AMM3HT | Mixed Analog Input/Output Module |
| Schneider TM2AMM6HT | Mixed Analog Input/Output Module |
| Schneider TM2ALM3LT | Low-Level Analog Input and Output Module |
| Schneider Advantys OTB | Distributed I/O System |
| Schneider Twido | Compact PLC Platform |
Recommended Related Models
| Model / Product | Product Type | Typical Application |
|---|---|---|
| Schneider TM2AMO1HT | Modicon M238 Analog Output Module | Single-channel voltage/current output |
| Schneider TM2AMM3HT | Modicon M238 Mixed Analog I/O Module | Two analog inputs and one output |
| Schneider TM2AMM6HT | Modicon M238 Mixed Analog I/O Module | Four analog inputs and two outputs |
| Schneider TM2AMI2HT | Modicon M238 Analog Input Module | Two-channel voltage/current acquisition |
| Schneider TM2AMI8HT | Modicon M238 Analog Input Module | Eight-channel analog signal acquisition |
| Schneider TM2ARI8LT | Modicon M238 Analog Input Module | Eight-channel temperature input |
Key Advantages
- Two independent bipolar voltage output channels.
- Supports ±10 V DC output signals.
- 11-bit resolution plus sign.
- Photocoupler isolation between I/O and internal logic.
- Removable screw terminal connection.
- 24 V DC external power supply.
- Compatible with Modicon M238 expansion architecture.
- Suitable for proportional and voltage-reference control applications.
Technical FAQs
1. What type of output signals does the TM2AVO2HT provide?
The TM2AVO2HT provides two analog voltage outputs, each supporting a range of -10 to +10 V DC. It is suitable for external equipment that accepts bipolar voltage reference signals.
2. Can the TM2AVO2HT directly control a 4–20 mA actuator?
No. The TM2AVO2HT is a voltage-output module and does not provide a 4–20 mA output mode. For applications requiring current signals, a compatible current-output module such as the TM2AMO1HT should be considered.
3. What is the minimum load impedance required for the TM2AVO2HT?
The specified minimum load impedance for voltage output is 3,000 Ω. The connected equipment and wiring should be checked to ensure that the output operates within this electrical requirement.
4. What should be checked if the TM2AVO2HT produces an incorrect output voltage?
Check the PLC channel configuration, output reference value, external 24 V DC supply, terminal wiring, and connected load. Also verify that the software channel configuration matches the physical voltage wiring.