TM3DI16G | Schneider Electric 16-Ch Digital Input Module

What Is the TM3DI16G Digital Input Module?

The Schneider Electric TM3DI16G is a Modicon TM3 digital input module that extends the I/O capacity of compatible logic controllers. Specifically, it provides 16 channels rated for 24 Vdc sink/source operation, classified as Type 1 per IEC 61131-2. Because machine builders often need more discrete sensing points than a base controller provides, this module delivers them without changing the host CPU.

From a cost perspective, the TM3DI16G protects the original controller investment. Instead of replacing a controller to gain inputs, engineers add this module to the existing TM3 bus. Consequently, panel space, wiring labor, and spare-part inventory stay controlled.

TM3DI16G Key Specifications

• Channels: 16 digital inputs in one module.
• Signal type: 24 Vdc, sink/source, Type 1 per IEC 61131-2.
• Input range: 24 Vdc nominal, 19.2-28.8 Vdc.
• Input current: 7 mA per channel at 24 Vdc.
• Isolation: 500 V AC between input and internal logic.
• Response time: 4 ms maximum turn on/off.
• Bus current: 34 mA at 5 V DC typical; 5 mA with all inputs off.
• Wiring: removable spring-cage terminal block, 3.81 mm pitch.

The 7 mA per-channel draw matters for cost analysis. Lower current per point reduces load on the 24 Vdc supply, so a smaller supply can serve the same panel.

Isolation and Electrical Behavior

The TM3DI16G provides 500 V AC isolation between the input side and internal logic. However, the data specifies no isolation between channel groups. Therefore, wiring practice should respect this boundary. The module draws power from the TM3 bus at 24 Vdc, so no separate field supply is required for logic operation.

In addition, the 4 ms maximum response time suits standard discrete sensing. For high-speed registration tasks, verify timing against the machine cycle before specifying this module.

Compatibility and Integration

The module works with Modicon M221, M241, M251, and M262 platforms. Because it uses the TM3 bus, integration follows the host controller's expansion architecture. Module status and bus status diagnostics help technicians locate faults quickly, which reduces troubleshooting time and downtime cost.

Installation Notes

Mount the module according to the host controller's TM3 expansion rules. The removable spring-cage terminal block simplifies field wiring and module replacement. Keep the 0...+55 °C operating range in mind when planning enclosure ventilation. The IP20 rating means the module belongs inside a protected cabinet.