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- Schneider
- TM3DM8R
- Discrete I/O Module
- France
- 90 × 84.6 × 27.4 mm
- 0.95 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Schneider TM3DM8R is a mixed discrete I/O module for the Modicon TM3 platform, combining discrete inputs and relay outputs in one compact expansion module. It is intended for machine control applications where both field status signals and a smaller number of relay-controlled devices need to be connected to the same controller.
In a compact automation panel, the input channels can collect signals from proximity sensors, limit switches, push buttons, selector switches, or auxiliary contacts. The relay outputs can then operate suitable devices such as solenoid valves, contactors, indicator circuits, or interposing relays. This combination is useful for machines where the I/O requirement does not justify installing separate input and output modules.
For example, a small assembly machine may use sensors to confirm cylinder positions and part presence while using relay outputs to control solenoid valves. The TM3DM8R can handle these two sides of the sequence within the same TM3 expansion arrangement, while the Modicon controller remains responsible for the machine logic.
The module is also suitable for equipment upgrades where additional mixed digital I/O is required. Before replacement, the controller compatibility, existing TM3 configuration, field signal assignment, and relay load requirements should be checked against the installed system.
Technical Specifications
| ParameterSpecification | |
|---|---|
| Manufacturer | Schneider Electric |
| Model | TM3DM8R |
| Product Family | Modicon TM3 |
| Product Type | Discrete I/O Module |
| Total I/O | 8 |
| Number of Inputs | 4 |
| Input Type | Discrete, 24 V DC |
| Number of Outputs | 4 |
| Output Type | Relay |
| Connection Type | Removable screw terminal block |
| Input Turn-On Time | 4 ms |
| Input Turn-Off Time | 4 ms |
| Output Turn-On Time | Max. 10 ms |
| Output Turn-Off Time | Max. 10 ms |
| Protection Degree | IP20 |
| Compatible Controllers | Modicon M221 / M241 / M251 / M262 |
| Dimensions | 90 × 84.6 × 27.4 mm |
| Weight | 0.95 kg |
Product Features
- Modicon TM3 mixed discrete I/O module
- 8 total I/O channels
- 4 discrete input channels
- 4 relay output channels
- 24 V DC discrete input signals
- Relay-based discrete output switching
- Removable screw terminal connection
- Suitable for compatible Modicon controller systems
- Combines digital inputs and relay outputs in one module
- Suitable for compact machine control panels
- Useful where sensor inputs and relay-controlled outputs are both required
Working Principle
The TM3DM8R combines four discrete input channels with four relay output channels, allowing the same expansion module to collect field states and switch suitable external circuits.
Field Sensors / Switches → 4 Discrete Inputs → Modicon Controller → 4 Relay Outputs → Actuators
A field sensor or switch changes the state of one of the input channels when a machine condition changes. The connected Modicon controller reads that state and applies the corresponding sequence, interlock, or control logic.
The controller can then command one of the relay outputs. For example, a limit switch may confirm that a cylinder has reached its retracted position, after which the PLC energizes a relay output connected to a solenoid valve for the next movement.
This arrangement is useful for compact machines because input acquisition and relay-based output control are handled within one module. The actual load connected to each relay still needs to remain within the applicable electrical limits.
Role in a Modicon TM3 Control Architecture
The TM3DM8R provides both discrete input acquisition and relay output switching within a Modicon TM3 expansion system.
Field Sensors / Switches → TM3DM8R Inputs → Modicon Controller → TM3DM8R Relay Outputs → Machine Actuators
| System ElementFunction | |
|---|---|
| TM3DM8R Inputs | Collect 4 discrete field signals |
| TM3DM8R Relay Outputs | Switch 4 discrete output circuits |
| Proximity Sensor | Detects machine position or product presence |
| Limit Switch | Provides end-of-travel feedback |
| Push Button / Selector | Provides operator commands |
| Modicon Controller | Processes input states and executes logic |
| Relay Output Circuit | Switches suitable external loads |
| Solenoid Valve | Provides discrete actuator control |
| Contactor / Interposing Relay | Interfaces with suitable external circuits |
The module is particularly suitable where the machine has a relatively small number of sensors and relay-controlled actuators. The final channel assignment should be documented in the electrical drawings and PLC application.
Industrial Applications
| ApplicationTypical Use | |
|---|---|
| Compact Assembly Machines | Cylinder position sensing and solenoid control |
| Packaging Equipment | Product detection and discrete actuator operation |
| Conveyor Systems | Position sensors and auxiliary equipment control |
| Small Machine Tools | Limit switches, operator inputs, and relay commands |
| Material Handling | Equipment status and actuator control |
| Pump Skids | Run feedback and discrete auxiliary control |
| Automated Workstations | Part detection and sequence-related actuator commands |
| Motor Control Panels | Auxiliary contacts and relay-based control circuits |
| Equipment Retrofit Projects | Adding mixed digital I/O to an existing Modicon controller |
| General Machine Automation | Combined sensor monitoring and discrete load switching |
Installation and Maintenance
- Confirm that the TM3DM8R is supported by the installed Modicon controller and TM3 expansion configuration.
- Verify that the required I/O allocation matches the module’s 4-input and 4-relay-output arrangement.
- Check the signal requirements of each connected input device before wiring.
- Confirm the voltage, current, and load characteristics of each relay output circuit.
- Check the output common arrangement when multiple relay channels are used together.
- Use the removable screw terminals according to the applicable field wiring requirements.
- Keep control wiring appropriately separated from high-power motor and drive cables where practical.
- Label each input and output channel according to the machine electrical documentation.
- During commissioning, activate each field sensor and verify the corresponding PLC input state.
- Test each relay output with its intended load and confirm that the connected actuator responds correctly.
- If an input or output remains in an unexpected state, check the field device, wiring, controller configuration, and load circuit before replacing the module.
- During scheduled maintenance, inspect terminals and relay-controlled circuits for loose connections, abnormal heating, contact wear, or unexpected switching behavior.
Related Components
| ComponentFunction | |
|---|---|
| Modicon M221 Controller | Compact controller for TM3 expansion |
| Modicon M241 Controller | Machine controller with TM3 I/O expansion |
| Modicon M251 Controller | Controller for modular machine I/O |
| Modicon M262 Controller | Logic and motion controller with TM3 I/O |
| Proximity Sensor | Provides discrete position or presence signals |
| Limit Switch | Provides mechanical position feedback |
| Push Button | Provides operator command input |
| Solenoid Valve | Discrete actuator controlled through relay output |
| Contactor | Switches suitable motor or power circuits |
| Interposing Relay | Provides an interface between control and field circuits |
| TM3 Digital I/O Modules | Adds further discrete I/O capacity |
Recommended Related Models
| Model / Product FamilyProduct Type | Typical Application |
|---|---|
| Schneider TM3DM16R | Mixed I/O applications requiring more input and relay output channels |
| Schneider TM3DM24R | Higher-density mixed discrete I/O applications |
| Schneider TM3DM24RG | Mixed I/O with spring terminal connections |
| Schneider TM3DI8 | Applications requiring discrete inputs only |
| Schneider TM3DQ8T | Applications requiring transistor digital outputs |
| Schneider Modicon M221 | Compact machine controller for TM3 expansion |
| Schneider Modicon M241 | Machine controller for larger TM3 I/O configurations |
Key Advantages
- 8 discrete I/O channels in one module.
- 4 digital inputs for field status and sensor signals.
- 4 relay outputs for discrete load switching.
- Suitable for compact machine control systems.
- Combines input and relay output functions in one expansion position.
- Screw terminal connection for field wiring.
- Integrates with the Modicon TM3 architecture.
Technical FAQs
What is the I/O configuration of the TM3DM8R?
The TM3DM8R combines 4 discrete inputs and 4 relay outputs, giving the module 8 I/O channels in total. It is suited to applications where the number of field inputs and relay-controlled outputs is relatively balanced.
What types of field devices can be connected to the TM3DM8R inputs?
Typical input devices include proximity sensors, limit switches, push buttons, selector switches, auxiliary contacts, and other compatible discrete field devices. The exact wiring should follow the electrical characteristics of the connected device and the module input requirements.
Can the relay outputs be used for solenoid valves?
Yes, suitable solenoid valves can be controlled through the relay outputs when their electrical characteristics remain within the applicable output ratings. For larger or higher-power loads, an intermediate relay or contactor may be required.
When would the TM3DM8R be preferable to separate input and output modules?
The mixed I/O arrangement is useful when a machine needs a modest number of digital inputs together with several relay outputs. Using one mixed module can simplify the I/O configuration compared with installing separate modules when the application does not require a large number of either input or output channels.