Rockwell Automation Publication 440R-UM013E-EN-P - March 2017 11
Overview Chapter 1
EM Safety Relay
(Cat.No.440R-EM4R2)
The EM safety relay is an expansion module with four immediately operated
electromechanical relay outputs. The only input to the EM safety relay is an
SWS input. The EM safety relay is designed to expand the outputs of the GSR
family of host relays. The EM safety relay also has an SWS output for further
expansion.
EMD Safety Relay
(Cat.No.440R-EM4R2D)
The EMD safety relay is an expansion module with delayed electromechanical
relay outputs. The EMD safety relay can be configured for one of the following
functions:
•On delay
• Off delay
•Jog
The settings of the two switches on the front face of the relay configure the
functionality and duration of the delay and jog.
The main input to the EMD safety relay is the single wire safety input. With
the SWS signal, the EMD safety relay is designed to expand the outputs of the
GSR family of host relays. The EMD safety relay also has an SWS output for
further expansion.
An additional input is used with the jog function or to set the off delay as
retriggerable. See EMD Safety Relay Timing Functions
on page 45 for detailed
descriptions on the EMD safety relay timing functions.
SI Safety Relay
(Cat.No.440R-S12R2)
The SI safety relay has one dual-channel input with two electromechanical
relay outputs. The SI safety relay can be configured for automatic or monitored
manual reset by adjusting the switch on the front. The SI safety relay also has
an SWS output.
The SI safety relay is similar in functionality to the MSR126 safety monitoring
relay.
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