Rockwell Automation Publication 440R-UM010C-EN-P - September 2016 7
Chapter 1
Overview
Hardware Features
Figure 1 - GLT 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 starting of the hazard.
The GLT safety relay can be operated with other safety relays in the GSR
family, by use of the single wire safety (SWS) connection. When 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.
Functions
The GLT safety relay can be configured 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, the
safety gate is locked in the closed position by a guard locking interlock. To
request access through the safety gate, the operator presses the Unlock Request
button. The GLT safety relay initiates a stop and unlocks the safety gate after
the time expires.
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