440R-D22R2 | Allen-Bradley Guardmaster Dual Input Safety Relay (DI)

The 440R-D22R2 is a Guardmaster safety relay designed to monitor and control the safety devices in industrial systems. It is used to ensure that the machines or equipment are disabled when safety inputs (like emergency stop buttons or safety gates) are activated. This relay offers redundant safety outputs to ensure that machines can be safely stopped in an emergency or fault condition, conforming to industrial safety standards like ISO 13849 and IEC 61508.

The 440R-D22R2 requires correct wiring of the safety inputs and safety outputs to ensure it functions correctly.

• Safety Inputs: The two safety inputs typically come from safety devices such as emergency stop buttons, light curtains, or other safety switches. These devices are connected to the input terminals on the relay.
• Safety Outputs: The relay provides two safety outputs that should be wired to the system’s control or stop mechanisms, such as disabling motors, shutting off power, or activating alarms.
• Power Supply: Connect the 24V DC power supply to the terminals marked 24V (positive) and 0V (negative) on the relay.
• Auxiliary Outputs: The relay may also have auxiliary outputs that can be used to signal non-safety devices or to log faults for diagnostic purposes.
• Ensure that the wiring follows safety standards, such as using redundant circuits or external contactors where required.

The detailed wiring diagram can be found in the product manual, which provides step-by-step instructions on how to wire the relay safely.

If you are looking for an equivalent product to the 440R-D22R2, some potential alternatives within the Allen-Bradley Guardmaster range include:

• 440R-D32R2: A safety relay with similar functionality but with different input/output configurations.
• 440R-D22D2: Another safety relay from the Guardmaster series with a slightly different output configuration.
• 1734-PLS (POINT I/O safety relay): A more modular option, part of the POINT I/O series, offering distributed I/O capabilities for flexible safety system integration.

Always verify compatibility by checking the specifications, safety ratings, and required features for your specific application.

The manual for the 440R-D22R2 safety relay can be found on the Rockwell Automation website under the Guardmaster section, or by visiting the product support page for Allen-Bradley safety relays. The manual contains detailed wiring instructions, functional diagrams, troubleshooting tips, and configuration guidelines. You can also access the manual within Studio 5000 or other Rockwell software, if applicable.

The 440R-D22R2 safety relay has built-in diagnostic LEDs to help troubleshoot and ensure proper functionality:

• Power LED: Indicates the status of the power supply.
• Output LEDs: Show whether the relay outputs are energized or de-energized.
• Fault LED: Illuminates if there is an issue with the safety circuit or inputs.
• Input LEDs: Show the status of the connected safety devices, indicating whether the inputs are active or not.

These diagnostic indicators allow for quick visual verification of the system's operational status and facilitate troubleshooting when issues arise.