Rockwell Automation Allen-Bradley Compact GuardLogix 5370 Controller Application Technique page 8

Door Locking and Monitoring with a 442G Access Box and an Integrated Safety Controller Safety Function
System Overview
The MAB and GuardLogix safety controller are connected over a CIP Safety connection.
The following status information is communicated from the MAB to the controller:
• Door/handle position, RFID technology (safety-rated status)
• Bolt position (safety-rated status)
• Lock status (safety-rated status)
• E-stop position (safety-rated status)
• Four push buttons (used for Unlock request/Lock request/resets in this safety function)
• RUN Mode
• MAB Faults
The following control information is communicated from the controller to the MAB:
• Fault resets
• Lock solenoid control (safety-rated control data)
• Four lights
• E-stop light
The final control device in this case is a pair of 100S safety contactors, K1 and K2. The contactors are controlled by a
1734-OB8S safety output module. The contactors are wired in a redundant-series configuration. A feedback circuit is
wired through the K1 and K2 normally open contacts and back to an input on the 1734-IB8S module to monitor the
contactors for proper operation. The contactors cannot restart if the feedback circuit is not in the correct state.
The contactor feedback circuit is wired to the 1734-IB8S safety input module in this example. Feedback wiring to a
safety module is not required for functional safety. The feedback circuit could be wired to a standard input module.
The system has individual reset buttons for resetting faults and resetting safety outputs.
8 Rockwell Automation Publication SAFETY-AT129B-EN-P - November 2018