Optical Bus - Allen-Bradley Guardmaster GuardLink User Manual

Optical Bus

Opto-link Communications
The GSR family of relays use an optical bus to communicate status information
to the 440R-ENETR Guardmaster Ethernet/IP network interface
safety relays have two optical buses:
• Bus 2 allows communication to pass from the 440R-ENETR interface
to the DI, DIS, EM, EMD. GLP, GLT, and SI safety relays (the CI safety
relay does not have an optical bus).
• Bus 3 is used exclusively by the DG safety relay for GuardLink
communications.
The optical bus ports are on each side of the housing, as shown in
Figure 41 - Optical Bus Ports
Opto Bus 3
(1) See publication 440R-UM009 for detailed 440R-ENETR interface information.
Rockwell Automation Publication 440R-UM015C-EN-P - April 2018
Opto Bus 2
8
Chapter
(1)
. DG
Figure 41.
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