Configured for discrete output execution in Modicon M238 and Twido control environments, the Schneider Electric TM2DRA8RT (TM2DRA8RT I/O Expansion Module) provides direct physical electrical execution for 8 N/O relay outputs.

Module Configuration and Logic Matrix

The TM2DRA8RT is an 8-point relay output expansion module, designed for interfacing with high-voltage or current-load field devices. It features two common points and supports switching up to 230 VAC or 30 VDC. The module integrates with the Modicon M238 expansion bus to extend discrete control capacity in distributed automation applications.

Hardware Specifications

PLC System Architecture Compatibility

The Modicon M238 platform utilizes a deterministic backplane bus to manage I/O expansion. The TM2DRA8RT module mapping requires configuration within the controller project to ensure cycle-accurate output switching. System integration is facilitated by the expansion bus, which supports I/O density scaling according to the specific controller’s processing constraints and firmware compatibility, ensuring that relay output status is synchronized with the master controller scan cycle.

Ordering Info

• 1 x TM2DRA8RT Digital output expansion module

• 1 x Removable screw terminal block

• Note: Field wiring should utilize appropriate suppression for inductive loads to maintain electrical durability ratings.

Field Installation Guidelines

• Mounting: Fasten the module onto a 35 mm symmetrical DIN rail. Ensure the side-mounted bus connector is firmly seated to the adjacent module or controller.

• Wiring: Utilize the removable screw terminal block for output connections. Observe the 7 A maximum current limit per output common point.

• Isolation: Adhere to the 1500 V channel-to-channel and 2300 V channel-to-logic isolation specifications; do not exceed these ratings during hi-pot testing or field fault diagnosis.

• Maintenance: Monitor the relay output status using the integrated display block; replace the module if contact resistance deviates from the 45 mOhm baseline during routine inspections.

Frequently Asked Questions

• Q: Is the TM2DRA8RT hot-swappable?

  A: No, the TM2DRA8RT does not support hot-swapping. The controller power supply must be disconnected before attempting to install or remove the expansion module to prevent backplane damage.

• Q: What is the mechanical life of the relays?

  A: The internal relays are rated for 20,000,000 mechanical operation cycles under no-load conditions.

• Q: How many common points are available?

  A: The module is equipped with 2 common points, splitting the 8 outputs into two groups.

• Q: Can this module switch 230 VAC loads?

  A: Yes, it is rated for 230 VAC operation, provided the load current does not exceed the 2 A per channel limit and standard suppression is used.

• Q: What is the electrical durability under inductive load?

  A: Electrical durability is 100,000 cycles for a 1 A AC-15 inductive load at 240 VAC (cos phi = 0.7).

• Q: Is there channel-to-channel isolation?

  A: Yes, the module provides 1500 V isolation between individual channels for 1 minute.

• Q: What are the input voltage requirements for the module electronics?

  A: The internal logic requires 5 VDC, while 24 VDC is used for internal signal processing, as indicated by the consumption specifications.

• Q: What is the minimum switching current?

  A: The minimum switching current is 0.1 mA at 0.1 VDC.