Configured for high-level signal processing in Modicon M238 and Twido controller environments, the Schneider Electric TM2AMI2HT (TM2AMI2HT I/O Expansion Module) provides direct physical electrical execution for 2 non-differential analog inputs.

Operational Module Matrix

The TM2AMI2HT is a 2-channel analog input expansion module featuring 12-bit resolution. It accepts high-level signals in either current (4-20 mA) or voltage (0-10 V) formats, utilizing an external 24 VDC power supply to maintain signal integrity through integrated photocoupler isolation.

Hardware Specifications

Control Platform Integration Characteristics

Integration into the M238 or Twido series is managed via the expansion port, where the module relies on the system backplane for logic communication. I/O density scaling is governed by the controller firmware, which requires definition of the expansion hardware in the configuration software. Firmware flash compatibility is managed through the project configuration to ensure deterministic data updates within the controller scan cycle.

Ordering Info

• 1 x TM2AMI2HT Analog input expansion module

• 1 x Removable screw terminal block

• Note: Shielded cabling is required for all analog signal runs to comply with electromagnetic compatibility standards.

Field Installation Guidelines

• Mounting: Secure the module to the specified DIN rail next to the controller or existing expansion units. Ensure all bus connectors are fully engaged.

• Cabling: Use shielded twisted-pair cables for all input signals. Terminate the cable shield at the designated ground connection point to minimize noise injection.

• Power: Connect the 24 VDC external supply to the designated terminals. Ensure the supply voltage remains within the 20.4-28.8 VDC range.

• Termination: Utilize the provided screw terminal block for wiring. Ensure all connections are torqued to specifications to maintain mechanical stability and signal continuity.

Frequently Asked Questions

• Q: Are the analog inputs galvanically isolated from each other?

  A: No, the two inputs share a common reference within the module. Isolation is provided between the I/O circuits and the internal controller logic via photocouplers.

• Q: What is the impact of a controller scan cycle on acquisition?

  A: The total acquisition period is calculated as 10 ms per channel plus the duration of one complete controller scan cycle.

• Q: Does the module support hot-swapping?

  A: No, the TM2AMI2HT does not support hot-swapping. The controller and external power supply must be powered down before module installation or removal.

• Q: What happens if the input signal exceeds 10 V?

  A: Exceeding the voltage limit may cause measurement non-linearity or damage to the internal input circuitry.

• Q: How is cross-talk handled between channels?

  A: The module architecture limits cross-talk to a maximum of 2 LSB under normal operating conditions.

• Q: Can I use this module with Advantys OTB?

  A: Yes, this module is compatible with the Advantys OTB distributed I/O system in addition to the M238 and Twido controllers.

• Q: Is the input impedance fixed?

  A: The input impedance is defined by the signal type, with >= 1 MOhm for voltage inputs and 10 Ohm for current inputs.

• Q: What is the effect of the temperature coefficient?

  A: The accuracy of the module is subject to a temperature coefficient of +/- 0.006 %FS/deg C, which should be accounted for in precision-dependent applications.