Rockwell Automation Publication 440R-UM013E-EN-P - March 2017 9
Chapter 1
Overview
The Guardmaster safety relay (GSR) family is a group of advanced general-
purpose and special-purpose safety relays. This user manual addresses the CI,
DI, DIS, EM, EMD, and SI safety relays from this family of relays.
Hardware Features
Figure 1 - Safety Relays
Removable Terminal Blocks
Each relay module is only 22.5 mm (0.9 in.) wide with four removable terminal
blocks (two on top and two on bottom). The terminal blocks are keyed to
confirm that they are installed in their proper slots. See Te r m i na l B l o c k
Removal and Replacement on page 87.
Status Indicators
Multiple status indicators provide status and diagnostics. Under fault
conditions, the PWR/Fault status indicator blinks in specific patterns to help
diagnose the fault. See Status Indicators
on page 41 and View the PWR/Fault
Status Indicator (Step 1) on page 63 for more information.
Removable Terminal Blocks
Status Indicators
Multi-position Switches to
set functionality
Optical Communication Bus
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