Table of Contents
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Chapter 1
Overview
16
Initialization State
The initialization state starts when power is applied to the GuardLink circuit
and ends when the GuardLink circuit enters the safe state. If no errors exist, the
GuardLink circuit transitions to the safe state; the initialization state cannot
transition to the operational state.
During initialization, the DG safety relay establishes and verifies the validity of
the circuit by checking the following items:
• All devices set their node number
• Not more than 32 devices exist
• The firmware of the taps is compatible with the DG safety relay
firmware.
• The DG safety relay detects node type and position automatically.
When a 440R-ENETR interface is used, it acquires the node types and
positions from the DG safety relay. The 440R-ENETR interface
validates the correct type and position against the setup that is provided
by the Studio 5000® Add-On-Profile (AOP). If validation is not
successful, the 440R-ENETR interface reports an error.
• Validates a terminator is attached to the GuardLink circuit.
Safe State
The GuardLink safety signal commands the DG safety relay to a safe state,
which turns all safety outputs OFF. The GuardLink safety signal monitors the
circuit for changes of state from the taps.
The CLU signal is HI (if guard locking devices are not used) or sending a
dynamic unlock signal (if guard locking devices are used). The taps indicate
this state by a solid red Link indicator.
Operational State
The GuardLink operational state is described as the GuardLink safety signal
that generates a specific dynamic signal to the DG safety relay and the CLU
signal being LO. The state of the DG safety relay safety outputs can be OFF or
ON. The state depends on the configuration, other safety device inputs, the
feedback monitoring input, and the reset input.
Rockwell Automation Publication 440R-UM015C-EN-P - April 2018
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