TM3DI8G | Schneider Electric 8-Ch 24 Vdc Digital Input Module

How the TM3DI8G Fits Modern Control Architectures

Industrial automation has evolved from centralized relay panels to distributed, modular control systems. As production lines became more flexible, engineers needed I/O that could be added exactly where signals originate. The Schneider Electric TM3DI8G digital input module answers that need within the Modicon TM3 expansion series. It provides eight 24 Vdc input channels for Modicon M221, M241, M251, and M262 platforms. Consequently, machine builders can scale input count without replacing the controller. This module uses sink/source wiring and removable spring terminals. Therefore, commissioning stays fast and wiring remains serviceable.

TM3DI8G Key Specifications and Electrical Behavior

The TM3DI8G operates from a nominal 24 Vdc input range of 19.2–28.8 Vdc. Each channel draws 7 mA at 24 Vdc. The module communicates through the TM3 bus and consumes 22 mA at 5 V DC when all inputs are off. Isolation is rated at 500 V AC between input and internal logic. However, there is no isolation between channel groups. Response time is 4 ms maximum for turn-on and turn-off. The module reports module status and bus status for diagnostics. Its housing measures 90 × 27.4 × 84.6 mm and weighs 0.085 kg.

Technical Specifications

• Input voltage: 24 Vdc nominal, 19.2–28.8 Vdc range
• Input current: 7 mA per channel at 24 Vdc
• Isolation: 500 V AC between input and internal logic
• Channels: 8 digital inputs, sink/source
• Response time: 4 ms max.
• Operating temperature: 0…+55 °C
• Protection rating: IP20

Where the TM3DI8G Delivers Value

Machine builders use the TM3DI8G to capture discrete sensor signals in compact panels. For example, a packaging line can monitor door switches, proximity sensors, and pushbuttons through one module. Because the module accepts sink or source wiring, it adapts to existing sensor types. In addition, the 4 ms response time suits general-purpose interlocks and status monitoring. The spring-cage terminals reduce wiring time during panel assembly. Consequently, integrators can standardize on a single input module across M221, M241, M251, and M262 projects.

Integration and Commissioning Notes

The TM3DI8G mounts directly on the TM3 bus of compatible Modicon controllers. No external power supply is required for the module itself; it draws 5 V DC from the bus. However, field wiring must provide the 24 Vdc input loop. Use the removable spring terminal block with 5.08 mm pitch for connections. Verify that input polarity matches the selected sink or source configuration. The module provides module status and bus status LEDs for quick fault identification. For precise matching with your existing I/O layout, contact AutoDCSTech with your exact requirements.