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- Schneider
- TM3DM24R
- Discrete I/O Module
- France
- 90 × 84.6 × 42.9 mm
- 0.281 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Schneider TM3DM24R is a 24-channel mixed discrete I/O module for the Modicon TM3 platform, combining 16 discrete inputs and 8 relay outputs in one expansion module. This arrangement is useful on machines where the controller needs to collect a relatively large number of field status signals while also switching several discrete loads.
In a machine-control cabinet, the 16 inputs can be used for proximity sensors, limit switches, push buttons, motor auxiliary contacts, cylinder-position feedback, and other 24 V DC field signals. The 8 relay outputs can then operate contactors, solenoid valves, indicator devices, interposing relays, or other suitable loads. Keeping both functions in one module can simplify the I/O arrangement when a machine has a mixed combination of sensors and actuators.
For example, a conveyor or packaging machine may require several product-detection sensors and position switches while also controlling solenoid valves and motor contactors. The TM3DM24R can handle these input and output points within the same TM3 expansion position, reducing the need to split the functions across separate input and output modules.
The module uses removable screw terminal blocks and is intended for compatible Modicon controllers including the M221, M241, M251, and M262 families. During replacement or retrofit work, the existing controller configuration, input assignments, relay load requirements, and field wiring should be checked together rather than selecting the module only by its total I/O count.
Technical Specifications
| ParameterSpecification | |
|---|---|
| Manufacturer | Schneider Electric |
| Model | TM3DM24R |
| Product Family | Modicon TM3 |
| Product Type | Discrete I/O Module |
| Total I/O | 24 |
| Number of Inputs | 16 |
| Input Type | Discrete, 24 V DC |
| Input Logic Type | Sink / Source |
| Input Type Standard | Type 1, IEC/EN 61131-2 |
| Number of Outputs | 8 |
| Output Type | Relay |
| Contact Type | Normally Open (NO) |
| Rated Output Voltage | 24 V DC / 240 V AC |
| Rated Output Current | 2 A per output |
| Output Common Current | 7 A maximum per common line |
| 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 × 42.9 mm |
| Weight | 0.281 kg |
Product Features
- Modicon TM3 mixed discrete I/O module
- 24 total I/O channels
- 16 discrete inputs
- 8 relay outputs
- 24 V DC sink/source input operation
- Type 1 inputs according to IEC/EN 61131-2
- Normally open relay output contacts
- 2 A rated current per relay output
- 24 V DC / 240 V AC relay switching capability
- Removable screw terminal blocks
- Individual channel status indication
- Suitable for Modicon M221, M241, M251, and M262 controllers
- Combines sensing and discrete output functions in one expansion module
Working Principle
The TM3DM24R handles two different parts of the machine I/O circuit: field signal acquisition through its 16 inputs and discrete load switching through its 8 relay outputs.
Sensors / Switches → 16 Digital Inputs → Modicon Controller → 8 Relay Outputs → Actuators
A sensor or switch connected to one of the 16 input channels changes the corresponding input state when the field condition changes. The Modicon controller reads these states and evaluates them through the application program.
The controller can then command one of the eight relay outputs according to the machine sequence. For example, a proximity sensor may confirm that a workpiece has reached a defined position, after which the PLC activates a relay output connected to a solenoid valve. The same module can therefore collect the position feedback and provide the discrete command required for the next machine action.
The relay outputs are particularly useful when the controlled circuit needs a relay contact rather than a transistor output. The actual load and switching frequency still need to remain within the specified output limits.
Role in a Modicon TM3 Control Architecture
The TM3DM24R combines field input acquisition and relay-based output switching within the same Modicon TM3 expansion architecture.
Field Sensors / Switches → TM3DM24R Inputs → Modicon Controller → TM3DM24R Relay Outputs → Machine Actuators
| System ElementFunction | |
|---|---|
| TM3DM24R Inputs | Collect 16 discrete field signals |
| TM3DM24R Relay Outputs | Switch 8 discrete output circuits |
| Proximity / Limit Sensor | Provides machine position or presence feedback |
| Push Button / Switch | Provides operator or equipment status input |
| Modicon Controller | Processes input states and executes logic |
| Relay Output Circuit | Provides switching contacts for field loads |
| Solenoid Valve | Converts a controller command into mechanical action |
| Contactor / Interposing Relay | Controls suitable higher-level machine circuits |
The module is useful where the I/O ratio is weighted toward input signals but several relay-controlled outputs are also required. The exact assignment of the 24 channels depends on the machine’s electrical design.
Industrial Applications
| ApplicationTypical Use | |
|---|---|
| Packaging Machinery | Product detection, actuator position, and solenoid control |
| Conveyor Systems | Sensor feedback combined with motor or actuator commands |
| Assembly Machines | Cylinder position monitoring and relay-based actuator control |
| Material Handling | Equipment status acquisition and discrete load switching |
| Machine Tools | Limit detection, operator inputs, and auxiliary control |
| Pump and Skid Equipment | Run/fault feedback and relay-controlled auxiliary devices |
| Automated Production Lines | Distributed machine status and actuator control |
| Motor Control Panels | Auxiliary contacts, start/stop logic, and interlocks |
| Process Equipment | Switch monitoring and discrete valve or actuator control |
| Equipment Retrofit Projects | Expanding both input and relay output capacity in one module |
Installation and Maintenance
- Confirm that the TM3DM24R is supported by the installed Modicon controller and TM3 expansion configuration.
- Check that the required I/O allocation matches the module’s 16 input and 8 relay output arrangement.
- Verify the voltage and signal characteristics of all connected input devices before wiring.
- Confirm that every relay output load is suitable for the specified voltage and current limits.
- Check the common-line loading when several relay outputs share the same output common.
- Use the removable screw terminal blocks according to the applicable wiring requirements for the connected circuits.
- Keep low-level control wiring appropriately separated from high-power motor and drive wiring where practical.
- Label each input and output channel according to the machine electrical drawings.
- During commissioning, operate each field sensor and verify the corresponding input LED and PLC status.
- Test each relay output with its intended load and confirm that the commanded switching sequence matches the machine program.
- If an input or output behaves unexpectedly, check the field device, wiring, controller configuration, and load circuit before replacing the module.
- Inspect relay-controlled circuits during maintenance for loose terminals, excessive contact wear, abnormal switching behavior, or loads that exceed the intended operating conditions.
Related Components
| ComponentFunction | |
|---|---|
| Modicon M221 Controller | Compact controller compatible with TM3 expansion |
| Modicon M241 Controller | Machine controller for TM3-based I/O systems |
| Modicon M251 Controller | Controller for distributed machine I/O |
| Modicon M262 Controller | Motion and logic controller with TM3 expansion |
| Proximity Sensor | Provides discrete position or presence signals |
| Limit Switch | Provides mechanical position feedback |
| Solenoid Valve | Discrete actuator controlled through relay output |
| Contactor | Controls suitable motor or power circuits |
| Interposing Relay | Provides additional isolation or interface between circuits |
| TM3 Digital I/O Modules | Adds further discrete I/O capacity |
Recommended Related Models
| Model / Product FamilyProduct Type | Typical Application |
|---|---|
| Schneider TM3DM8R | Smaller mixed I/O applications with 4 inputs and 4 relay outputs |
| Schneider TM3DM16R | Mixed I/O applications with 8 inputs and 8 relay outputs |
| Schneider TM3DM24RG | 24-channel mixed I/O with spring terminal connection |
| Schneider TM3DM32R | Higher-density mixed I/O applications |
| Schneider TM3DI16 | Applications requiring additional discrete inputs only |
| Schneider TM3DQ8T | Applications requiring transistor digital outputs |
| Schneider Modicon M241 | Machine controller for mixed TM3 I/O expansion |
Key Advantages
- 24 discrete I/O channels in one module.
- 16 digital inputs for field status and sensor signals.
- 8 relay outputs for discrete load switching.
- Supports both 24 V DC input signals and relay-based output circuits.
- Suitable for mixed sensor and actuator applications.
- Removable screw terminal connection.
- Compatible with several Modicon controller families.
Technical FAQs
What is the I/O arrangement of the TM3DM24R?
The TM3DM24R combines 16 discrete inputs and 8 relay outputs, giving the module 24 I/O channels in total. This makes it suitable for machines that require more input points than relay-controlled outputs.
What type of loads can the TM3DM24R relay outputs control?
The relay outputs can be used with suitable discrete loads such as contactor coils, solenoid valves, indicator devices, and interposing relays. Each output has a rated current limit, and the shared common-line loading also needs to be considered when several outputs operate together.
What is the difference between TM3DM24R and TM3DM24RG?
Both models provide the same basic 16-input / 8-relay-output mixed I/O arrangement. The main connection difference is the terminal type: TM3DM24R uses removable screw terminal blocks, while TM3DM24RG uses removable spring terminal blocks.
What should be checked if a relay output does not switch the connected actuator?
First check the PLC output command and the corresponding output status indication. Then inspect the relay wiring, common connection, load voltage, actuator coil, and terminal connections. If the controller commands the output correctly but the external circuit does not operate, the investigation should continue through the relay contact and field load circuit.