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GuardLink Principle of
Operation
Figure 3
shows an example of a DG safety relay operating as the equivalent of a
DI safety relay. In
Figure
input devices, control and monitor two contactors with a manual reset input.
The 440R-ENETR interface reports the status to the machine control system.
The machine control system can also initiate a reset command.
Figure 3 - Two Safety Devices
Optional
EtherNet/IP
interface
The GuardLink circuit is a continuous chain of safety devices that are
connected in series with only four wires. Two wires provide power and ground
to the taps and devices.
The third wire (GuardLink Safety Signal) performs the diagnostics on the taps
and the devices that are connected to each tap while in the safe state. It also
carries the dynamic safety signal while in an operational state.
The fourth wire (CLU) provides the lock/unlock commands to guard locking
devices on the circuit.
GuardLink State
The GuardLink chain can be in one of four states:
• Initialization
• Safe
• Operational
• Fault
Rockwell Automation Publication 440R-UM015C-EN-P - April 2018
3, the DG safety relay is configured to accept two
Two safety devices (E-stops, mechanical interlocks,
light curtains, scanners, OSSD interlocks)
Cordsets or
patchcords
DG safety relay
R R
Overview
Chapter 1
15
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