Schneider TM3DI8 Digital Input Module 8 Channels

Schneider TM3DI8 Digital Input Module

Product Introduction

The TM3DI8 belongs to the Schneider Electric Modicon TM3 expansion series. This digital input module adds eight 24 VDC channels to a compatible logic controller. Specifically, it targets machine builders who need extra sensor or switch inputs without replacing the main PLC. The module snaps onto the same DIN rail as the host controller. Meanwhile, it draws power directly from the TM3 bus, so no separate supply wiring is needed. As a result, installation stays clean and fast. The TM3DI8 works with Modicon M221, M241, M251, and M262 platforms. Additionally, its compact 27.4 mm width saves valuable cabinet space.

Technical Specifications

The module provides 8 digital input channels. Each channel accepts 24 VDC signals in sink or source wiring. The rated range spans 19.2 to 28.8 VDC, matching standard industrial supplies. Furthermore, input current equals 7 mA per channel at 24 VDC. The design follows Type 1 per IEC 61131-2, so it suits standard discrete sensors.

Response time reaches 4 ms maximum for both turn-on and turn-off. Besides, isolation stands at 500 V AC between the input side and internal logic. However, no isolation exists between channel groups. For diagnostics, the module reports both module status and bus status. This helps technicians find wiring or communication faults quickly.

Electrical and Environmental Parameters

The unit receives 24 VDC through the TM3 bus. Bus current draw equals 22 mA at 5 VDC with all inputs off. The housing measures 90 × 27.4 × 84.6 mm in height, width, and depth. Moreover, it weighs only 0.085 kg, so it adds almost no load to the rail. The protection rating is IP20, meaning it must sit inside a clean enclosure.

Operating temperature ranges from 0 to +55 °C. Storage temperature spans -25 to +70 °C. These ratings cover most factory floors and warehouses. However, avoid condensation and direct water exposure.

Installation Guide

First, mount the TM3DI8 on a standard DIN rail next to the host controller. Next, slide the module until the bus connector locks into place. After that, wire the sensors to the removable screw terminal block with 5.08 mm pitch. Use shielded cable for long runs to reduce electrical noise.

Then, assign the module address in SoMachine or EcoStruxure Machine Expert. Meanwhile, confirm the module appears in the bus diagnostics window. Finally, test each channel with a known signal before running the machine. If a channel behaves abnormally, check wiring polarity and terminal torque first.

Packaging List

• 1 × Schneider TM3DI8 Digital Input Module

• 1 × Removable screw terminal block

• 1 × Quick start guide

• 1 × Original carton box

Shipping methods: Fedex, UPS, DHL.

FAQ

Q1: Which controllers work with the TM3DI8?
A: It is compatible with Modicon M221, M241, M251, and M262 controllers. These platforms accept TM3 expansion modules directly.

Q2: Does the TM3DI8 support sink and source wiring?
A: Yes, each channel accepts both sink and source configurations. You can mix wiring styles across the eight channels.

Q3: Is a separate power supply required for this module?
A: No, the module draws power from the TM3 bus. Only the field input signals need an external 24 VDC source.

Q4: What is the response time of the TM3DI8?
A: The maximum response time is 4 ms for turn-on and turn-off. This suits most standard discrete sensing tasks.

Q5: How many TM3DI8 modules can I add to one controller?
A: The limit depends on the host controller and its bus power budget. Check the M2xx configuration guide for the exact maximum count.