Schneider TM2AMI2HT Analog Input Module M238

TM2AMI2HT Analog Input Module for M238 Controllers

Product Introduction

The Schneider TM2AMI2HT expands the I/O capacity of the Modicon M238 logic controller. This module supports two high-level analog inputs. Each channel accepts either 4-20 mA current or 0-10 V voltage signals. The inputs are non-differential, which simplifies wiring in many factory environments.

Additionally, the TM2AMI2HT delivers 12-bit resolution for precise measurement. Its compact size saves space on the DIN rail. Many users choose this module for mixing and matching with Twido and Advantys OTB systems.

Technical Specifications of the TM2AMI2HT

Analog Input Details

The module includes two non-differential analog inputs. You can configure each channel for 4-20 mA current or 0-10 V voltage. The LSB value is 2.5 mV for voltage mode. In current mode, the LSB value is 4.8 µA.

Resolution and Accuracy

Resolution is fixed at 12 bits. At 25°C, the measurement error stays within ±0.2% of full scale. Repeat accuracy reaches ±0.5% FS. Non-linearity is only ±0.2% FS. Total error across all conditions stays below ±1% FS.

Electrical Characteristics

Input impedance is at least 1 MΩ for voltage signals. For current signals, it drops to 10 Ω. Permissible continuous overload is 13 V for voltage mode and 40 mA for current mode. Cross talk between channels is ≤ 2 LSB, which ensures signal integrity.

Power Requirements

The TM2AMI2HT needs an external 24 V DC supply. Usable voltage range is 20.4 to 28.8 V. Internal current consumption is 50 mA at 5 V DC. External consumption is 40 mA at 24 V DC.

Isolation and Protection

Insulation between channels and internal logic uses a photocoupler. Dielectric strength is 500 V between I/O and external supply. The same 500 V rating applies between I/O and internal logic. Such protection reduces electrical noise interference.

Mechanical and Environmental Data

Dimensions and Weight

The module is very compact. Width is only 23.5 mm. Height measures 90 mm, and depth is 70 mm. Product weight is 0.085 kg. With packaging, gross weight reaches 0.197 kg.

Environmental Limits

The unit operates in standard industrial environments. However, the temperature coefficient is ±0.006% FS/°C. This indicates stable performance across moderate temperature changes.

Installation Guidelines for the TM2AMI2HT

Mounting Instructions

Mount the module on a DIN rail inside a control cabinet. First, ensure the Modicon M238 controller is powered off. Next, click the module onto the rail. Then connect it to the right side of the controller or another expansion module.

Wiring Recommendations

Use shielded cable for all analog signal wiring. Connect the shield to ground at one end only. This prevents ground loops. For current signals, wire the positive to the input terminal and negative to COM. For voltage signals, use a twisted pair cable.

Power Connections

Apply external 24 V DC to the dedicated supply terminals. Do not connect or disconnect wiring while power is active. Always verify the polarity before turning on the system.

Packaging List

• 1 x Schneider TM2AMI2HT Analog Input Module

• 1 x Removable screw terminal block

• 1 x Product quick start guide (multi-language)

Note: The unit is shipped in its original anti-static packaging.

Shipping Information

We ship worldwide using FedEx, UPS, and DHL. Tracking numbers are provided within 24 hours after dispatch.

Frequently Asked Questions (FAQ)

1. Can the TM2AMI2HT mix current and voltage inputs on the same module?
Yes, you can configure each of the two channels independently. One channel can read 4-20 mA while the other reads 0-10 V. This flexibility makes the module useful for mixed sensor types.

2. What is the acquisition time for both channels?
The acquisition period is 10 ms per channel plus one controller cycle time. Therefore, reading both channels takes approximately 20 ms plus the scan time of your M238 controller.

3. Does the TM2AMI2HT work with Twido controllers?
Yes, the datasheet confirms range compatibility with Twido and Advantys OTB systems. However, always verify firmware versions before installation.

4. What happens if I apply 24 V to the voltage input?
The permissible continuous overload for voltage mode is only 13 V. Applying 24 V may damage the input circuit. Use a voltage divider or signal conditioner if your sensor outputs higher voltages.

5. How do I reduce electrical noise on the analog signals?
Use shielded cable and ground the shield at one end only. Additionally, keep analog wiring away from high-power AC cables. The internal photocoupler isolation also helps reject common-mode noise.