Here are some key features and functions of the Allen-Bradley 440R-D22R2 Safety Relay:

Dual-channel input: The relay has two input channels, allowing it to monitor two separate safety devices or circuits independently. This redundancy enhances safety by providing a backup in case one channel fails.

Safety outputs: The safety relay provides safety output contacts that can be used to control safety-related devices, such as motor contactors, solenoid valves, or emergency stop systems. These outputs are designed to open or close based on the status of the input channels.

Reset modes: The relay offers different reset modes, including automatic, manual, and monitored manual reset options. These modes determine the behavior of the relay after a safety function is triggered.

Diagnostic indicators: The 440R-D22R2 safety relay is equipped with diagnostic LEDs that provide visual feedback on the status of the relay and its input channels. This helps with troubleshooting and monitoring the system's safety status.

Safety-rated inputs: The relay accepts safety signals from devices such as safety switches, light curtains, emergency stop buttons, and interlocking devices. It is designed to meet the safety requirements of international standards, such as ISO 13849 and IEC 61508.