Product Overview
When you need precise analog signal acquisition in a compact form factor, the Schneider TM2AMI2HT I/O expansion module delivers reliable performance. Part of the Modicon M238 logic controller family, this module provides 2 high-level analog inputs that accept either 0...10 V voltage or 4...20 mA current signals in non-differential configuration. Its 12-bit resolution ensures accurate measurement for industrial automation tasks.
Technical Specifications Breakdown
The TM2AMI2HT offers a 12-bit analog input resolution with an LSB value of 2.5 mV for voltage inputs and 4.8 µA for current inputs. Measurement error stays within ±0.2% of full scale at 25 °C, while the temperature coefficient of ±0.006% FS/°C maintains stability across varying conditions. The module achieves a repeat accuracy of ±0.5% FS and non-linearity of ±0.2% FS, with total error limited to ±1% FS. Cross talk between channels is ≤2 LSB. Sampling duration is 10 ms per channel plus one controller cycle time.
Industry Applications
In process control environments, the TM2AMI2HT excels at reading analog sensors such as pressure transmitters or temperature transducers that output 4...20 mA signals. For voltage-based sensors like potentiometers or 0...10 V level sensors, the module provides a direct interface without external signal conditioning. Its non-differential inputs suit applications where the signal source shares a common ground with the controller.
Installation & Setup Guidance
Mount the TM2AMI2HT on a DIN rail adjacent to your Modicon M238 controller. Connect using the supplied 1 removable screw terminal block. Use shielded cable for all analog signal wiring to minimize electrical noise. The module requires an external 24 V DC supply with limits of 20.4…28.8 V. Current consumption is 50 mA at 5 V DC internal and 40 mA at 24 V DC external.
Maintenance & Reliability
The TM2AMI2HT features photocoupler insulation between channels and internal logic, providing 500 V dielectric strength between I/O and the external supply circuit, and 500 V between I/O and internal logic. This isolation enhances reliability in industrial environments. Regularly inspect connections and verify signal integrity to maintain measurement accuracy. The module's compact dimensions (23.5 mm width, 70 mm depth, 90 mm height) and light weight (0.085 kg) simplify integration.
Compatibility & Integration
This module is compatible with Twido and Advantys OTB ranges, in addition to Modicon M238 logic controllers. It integrates seamlessly into existing Schneider Electric automation architectures. For systems requiring additional analog inputs, the TM2AMI2HT expands I/O capacity without complex configuration.
Selection Guide & Purchasing Advice
Before ordering, confirm that your controller supports I/O expansion modules and that the TM2AMI2HT's 2 analog inputs meet your application needs. Verify the supply voltage (24 V DC) and signal type (voltage or current). SpareTechPLC stocks the TM2AMI2HT and can advise on compatibility with your specific Modicon M238 setup. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Comparison with Similar Modules
When selecting an analog input module for Modicon M238 systems, consider these alternatives:
- TM2AMI2HT: 2 high-level analog inputs, 12-bit resolution, voltage/current, non-differential.
- TM2AMI4HT: 4 analog inputs, similar resolution and signal types for higher channel count needs.
- TM2AMI2LT: 2 low-level analog inputs for thermocouple or RTD sensors.
Each module serves distinct input requirements. The TM2AMI2HT is ideal for standard 0...10 V or 4...20 mA signals where only two channels are needed.
