440R-W23222 Allen Bradley Guard Locking with TimeDelay (GLT) Safety Relay

The GLT is a guard locking with time-delay safety relay. This safety relay is designed to use time-delayed outputs for use in Stop Category 1 and to unlock a safety gate when the time expires. It also provides a lock command to lock a safety gate before the hazard starts.
The GLT safety relay can operate with other safety relays in the GSR family, by use of the single wire safety (SWS) connection. When the GLT safety relay receives an SWS signal from other GSR relays, the GLT safety relay issues an unlock command. When the GLT safety relay turns on its safety output, it also turns on its SWS output for use by other GSR safety relays.

You can configure the GLT safety relay to operate in one of two types of safety functions, both of which involve time-delayed safety signals.
Function 1 – Guard Locking
Function 1 is used for guard locking applications. During production, a guard locking interlock locks the safety gate in the closed position. To request access through the safety gate, the press the Unlock Request button. The GLT safety relay initiates a stop and unlocks the safety gate after the time expires.
Function 2 – E-stop
Function 2 is used for E-stop applications. The production process requires an orderly shutdown. Some processes must stop immediately and some must stop shortly thereafter. To initiate the stop, press an E-stop button. The GLT safety relay initiates an immediate stop command followed by a delayed stop command.