TM2AMI2HT Analog Input Module Guide for Modicon M238

Understanding the TM2AMI2HT Analog Input Module

When you need precise analog signal acquisition in a compact form factor, the Schneider TM2AMI2HT offers a reliable solution. This I/O expansion module is part of the Modicon M238 logic controller family, designed for applications requiring high-level voltage or current inputs. With two non-differential channels, it handles both 4...20 mA current and 0...10 V voltage signals, giving you flexibility in sensor integration.

The module's 12-bit resolution provides fine granularity for monitoring tasks. Each LSB corresponds to 2.5 mV for voltage inputs and 4.8 µA for current inputs, ensuring accurate measurement in process control environments. This makes the TM2AMI2HT suitable for applications where signal fidelity matters.

Key Technical Specifications and Performance

The TM2AMI2HT operates with a rated supply voltage of 24 V DC, within a range of 20.4 to 28.8 V. It draws 50 mA at 5 V DC internally and 40 mA at 24 V DC externally, keeping power demands modest. The module's measurement error is ±0.2% of full scale at 25 °C, with a repeat accuracy of ±0.5% FS and non-linearity of ±0.2% FS, ensuring consistent performance.

Sampling duration is 10 ms, with an acquisition period of 10 ms per channel plus one controller cycle time. The input impedance is ≥1 MOhm for voltage and 10 Ohm for current, which minimizes signal loading. Permissible continuous overload is 40 mA for current inputs and 13 V for voltage inputs, providing a safety margin against transient spikes.

Applications in Industrial Automation

In a typical packaging line, the TM2AMI2HT can monitor pressure or temperature transmitters that output 4...20 mA signals. The high-level input range eliminates the need for external signal conditioners, simplifying wiring and reducing panel space. For voltage-based sensors, such as 0...10 V level transducers, the module directly accepts the signal without additional scaling hardware.

Another common use case is in material handling systems where analog sensors track conveyor speed or product position. The module's 12-bit resolution captures subtle changes, enabling precise control adjustments. The photocoupler insulation between channel and internal logic provides electrical isolation, protecting the controller from ground loops and noise.

Compatibility and Integration

The TM2AMI2HT is designed for seamless integration with Modicon M238 logic controllers. It also offers range compatibility with Twido and Advantys OTB systems, making it a versatile choice for mixed-platform environments. The module connects via one removable screw terminal block, simplifying field wiring and maintenance.

For reliable signal integrity, use shielded cable as specified in the documentation. The module's dimensions—23.5 mm width, 70 mm depth, and 90 mm height—allow it to fit into tight enclosures. Its weight of 0.085 kg keeps the overall assembly light.

Frequently Asked Questions

What is the input resolution of the TM2AMI2HT?

The analog input resolution is 12 bits. For voltage inputs, the LSB value is 2.5 mV; for current inputs, the LSB value is 4.8 µA. This provides fine measurement granularity for both signal types.

What is the permissible continuous overload for the current input?

The module can withstand a continuous overload of 40 mA on the current input type. For voltage inputs, the permissible continuous overload is 13 V. These ratings help protect the module during transient conditions.

Does the TM2AMI2HT require an external power supply?

Yes, the module requires an external supply. The rated supply voltage is 24 V DC, with limits of 20.4 to 28.8 V. It draws 40 mA at 24 V DC externally and 50 mA at 5 V DC internally.

Why Choose AutoDCSTech for Your TM2AMI2HT

AutoDCSTech offers genuine Schneider TM2AMI2HT modules with reliable availability. Our team understands industrial automation requirements and can help you select the right components for your application. We stock this module and can provide fast shipping to minimize downtime.

Please verify current lifecycle status and availability with AutoDCSTech before ordering. Our support staff can confirm stock levels and assist with any technical questions about integrating the TM2AMI2HT into your Modicon M238 system.