Rockwell Automation Allen-Bradley Compact GuardLogix 5370 Controller Application Technique page 14

Door Locking and Monitoring with a 442G Access Box and an Integrated Safety Controller Safety Function
Rung 22
This indicator can be used to inform maintenance that the MAB has a fault that requires a power cycle to recover.
Rung 23
This indicator can be used to inform maintenance that the MAB has a fault that requires the emergency stop (E-stop) on
the MAB to be cycled, followed by a reset, to recover.
Rung 24
This indicator can be used to inform maintenance that the MAB has a fault that requires the door on the MAB to be
cycled, followed by a reset, to recover. In this example, the top left light on the MAB is flashed to indicate that an unlock
is required before the door can be cycled. This light also flashes if the DCSTL instruction is in a state that requires a door
cycle.
Rung 25
This indicator can be used to inform maintenance that the MAB has a fault that requires the door on the MAB to be
opened, followed by a reset, to recover.
Rung 26
This indicator can be used to inform maintenance that the MAB has a fault that requires the lock on the MAB to be
cycled, followed by a reset, to recover.
Rung 27
The bottom right light on the MAB is energized when the contactors are energized, and the light blinks if the safety
interlocks are satisfied and all that remains to energize the contactors is a safety reset (bottom right button on the MAB).
14 Rockwell Automation Publication SAFETY-AT129B-EN-P - November 2018