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- Allen Bradley
- 440R-M23089
- Safety Relay
- USA
- 114.5 × 45 × 99 mm
- 0.49 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Allen Bradley 440R-M23089 Guardmaster MSR138.1DP Safety Relay is a safety control device used to evaluate safety-related input signals and control the corresponding machine safety outputs. It can be used with devices such as emergency-stop switches, guard interlocks, and other safety contacts as part of a machine safeguarding circuit.
In a typical control panel, the safety relay sits between field-level safety devices and the machine’s final switching elements. It monitors the incoming safety circuit and controls the output state according to the configured safety logic. This allows a machine to respond to an opened guard, emergency-stop activation, or other safety-related condition without relying solely on the standard PLC control program.
The MSR138.1DP is suited to machine safety applications where discrete safety signals need to be evaluated before enabling hazardous machine operation. It can be incorporated into conveyor systems, production machinery, automated equipment, and other industrial control architectures.
Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Allen Bradley |
| Model / Part Number | 440R-M23089 |
| Product Type | Guardmaster MSR138.1DP Safety Relay |
| Series | Guardmaster MSR138.1DP |
| Application | Safety circuit monitoring and machine protective control |
| Dimensions | 114.5 × 45 × 99 mm |
| Weight | 0.49 kg |
Product Features
- Guardmaster MSR138.1DP safety relay for machine safeguarding applications.
- Evaluates safety-related input circuits from connected field devices.
- Suitable for emergency-stop and guard-monitoring applications.
- Provides safety outputs for controlling downstream machine safety equipment.
- Can be integrated with contactors, safety switching devices, and other safety components.
- Separates safety-related signal processing from standard machine control logic.
- Suitable for industrial machinery, conveyors, production lines, and automated equipment.
- Provides a dedicated safety-control layer within a machine automation architecture.
Working Principle
The 440R-M23089 receives safety-related input conditions from connected devices such as emergency-stop switches or guard interlocks. During normal operation, the safety inputs remain in the required state and the relay permits its safety outputs to maintain the configured operating condition.
When a safety device is activated, the input state changes. The relay evaluates that condition and changes its output state accordingly. The downstream safety circuit can then remove machine energy, disable a hazardous motion, or initiate another predefined protective action.
A typical signal path is:
Safety Device → 440R-M23089 Safety Relay → Safety Output → Contactor / Drive Safety Circuit → Machine Stop
The relay therefore provides an intermediate safety-control function between field safety devices and the equipment responsible for bringing the machine to its required safe state.
Role in a Machine Safety Control Architecture
The MSR138.1DP occupies the safety logic layer between field devices and final machine control elements. It evaluates the state of the safety circuit and determines whether the downstream safety outputs can remain enabled.
Emergency Stop / Guard Interlock → 440R-M23089 → Safety Outputs → Contactors / Drive Safety Function → Machine
| System Element | Function |
|---|---|
| Emergency-Stop Devices | Provide manual emergency-stop inputs |
| Guard Interlocks | Monitor the position of machine guards and access doors |
| 440R-M23089 | Evaluates the connected safety input circuit |
| Safety Outputs | Control the downstream safety switching circuit |
| Contactors / Drive Safety Interface | Remove or inhibit hazardous machine energy |
| Standard PLC | Handles normal machine sequencing and status monitoring |
| HMI | Displays machine status, alarms, and diagnostic information |
The safety relay should be implemented as part of a complete safety function based on the machine’s risk assessment. The final safety performance depends on the complete signal chain, connected devices, stopping capability, wiring, and validation.
Industrial Applications
| Application | Typical Use |
|---|---|
| Conveyor Systems | Evaluating emergency-stop and guard-monitoring circuits |
| Production Machinery | Controlling safety circuits around hazardous machine movement |
| Packaging Equipment | Monitoring access guards and emergency-stop devices |
| Automated Assembly | Processing discrete safety signals before machine operation is permitted |
| Material Handling | Managing safety inputs around conveyors and transfer equipment |
| Machine Tools | Monitoring protective doors and emergency-stop circuits |
| Industrial Automation | Providing a dedicated relay-based safety control layer |
Installation and Maintenance
- Verify the safety circuit design
Confirm that the MSR138.1DP is suitable for the intended safety function and connected devices before installation. - Mount the relay securely
Install the relay correctly within the control cabinet and ensure that the mounting arrangement is stable. - Follow the wiring diagram
Connect safety inputs, outputs, power, and reset-related circuits according to the applicable wiring documentation. - Separate safety wiring appropriately
Route safety-related conductors in a manner that reduces the possibility of unintended interference or wiring faults. - Check input device compatibility
Verify that emergency-stop switches, guard interlocks, and other connected safety devices are suitable for the intended circuit. - Verify output connections
Confirm that safety outputs are correctly connected to the downstream contactors, drive safety interfaces, or other final control elements. - Test each safety input
Activate every connected safety device individually and verify that the relay responds as intended. - Check reset behavior
Confirm that the machine does not restart unexpectedly after a safety input has returned to its normal state. - Inspect terminal connections
Periodically check for loose conductors, damaged wiring, or signs of overheating around the relay terminals. - Monitor diagnostic indicators
Use the available status indication to help identify input, output, or system conditions during commissioning and maintenance. - Test the complete stopping function
Verify that activation of the safety relay produces the required response at the machine, not merely a change of relay status. - Document safety inspections
Record periodic safety tests and maintenance activities according to the machine’s safety procedures.
Compatible System Components
| Component | Role in the System |
|---|---|
| Allen Bradley Guardmaster Cable Pull Switches | Provide emergency-stop inputs along extended machinery |
| Allen Bradley Guardmaster Tongue Interlocks | Monitor movable machine guards |
| Allen Bradley Safedge Contact Edges | Provide pressure-sensitive machine protection |
| Allen Bradley Emergency-Stop Devices | Provide manual emergency-stop inputs |
| Allen Bradley Contactors | Switch machine power as part of the safety circuit |
| Allen Bradley PowerFlex Drives | Can participate in safety stopping architectures where the selected drive configuration supports the required function |
| Allen Bradley PLC / HMI Systems | Handle standard machine control, status, and diagnostics |
Recommended Related Models
| Model | Product Type | Typical Relationship |
|---|---|---|
| Allen Bradley 440R-M23089 | Guardmaster MSR138.1DP Safety Relay | Same product configuration |
| Allen Bradley 440R Series | Guardmaster Safety Relay | Related safety relay family |
| Allen Bradley 440E Series | Guardmaster Cable Pull Switch | Provides emergency-stop input |
| Allen Bradley 440K Series | Guardmaster Safety Interlock | Provides machine guard monitoring |
| Allen Bradley 440F Series | Guardmaster Safedge Contact Edge | Provides pressure-sensitive edge protection |
| Allen Bradley 440R-EM4R2 | Guardmaster Safety Relay | Related safety relay option |
Key Advantages
- Provides dedicated relay-based evaluation of safety-related input circuits.
- Suitable for emergency-stop and guard-monitoring applications.
- Separates safety signal evaluation from standard PLC control logic.
- Can control downstream contactors and other machine safety switching elements.
- Integrates with Guardmaster field safety devices.
- Provides a practical safety-control layer for industrial machinery.
Technical FAQs
What is the primary function of the 440R-M23089?
The 440R-M23089 is a Guardmaster MSR138.1DP safety relay used to evaluate safety-related input circuits and control the associated safety outputs.
What types of devices can provide inputs to the safety relay?
Depending on the configured safety circuit, inputs can come from devices such as emergency-stop switches, guard interlocks, and other compatible safety contacts. The complete circuit should be configured according to the intended safety function.
What should be checked if the safety relay does not enable its outputs?
Start with the connected safety devices and verify that every required input is in its normal state. Then inspect the wiring, power supply, reset circuit, output connections, and available diagnostic indications.
Can the safety relay replace a standard PLC for machine control?
No. A safety relay is intended to perform defined safety-related control functions rather than general machine sequencing. A standard PLC can continue to manage normal automation logic while the safety relay handles the applicable safety circuit.