Rockwell Automation Publication 440R-UM013F-EN-P - July 2021 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 Terminal Block
Removal and Replacement on page 75.
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 35
and View the PWR/Fault
Status Indicator (Step 1) on page 54 for more information.
Multi-position Switches
Most safety relays are configured by adjusting multi-position switches to set
their functionality.
(a)
The switches are on the front face of the relay so you can
see the set position during, and after, configuration. During the configuration
process, status indicators on the front face of the relay confirm the switch
settings. See Switch Adjustment on page 31
for more information.
(a) The EM safety relay does not require configuration.
Removable Terminal Blocks
Status Indicators
Multi-position Switches to
set functionality
Optical Communication Bus
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