10 Rockwell Automation Publication 440R-UM013G-EN-P - December 2022
Chapter 1 Overview
Optical Communication Bus
The DI, DIS, EM, EMD, and SI safety relays have an optical communications bus that delivers
status and diagnostics to the catalog number 440R-ENETR EtherNet/IP™ module (not shown in
Figure 1 on page 9) without additional wiring. See Ethernet Communication on page 51 for more
information.
Safety relays use single wire safety (SWS) signals that allow multiple safety relays to work in
coordination with one another in small to medium size safety systems. The SWS feature allows
safety relays to communicate the highest safety-rated control signal from one safety system
to another over one wire (plus a common ground connection). The wire must be less than 30 m
(98.4 ft) long.
CI Safety Relay
(Cat.No.440R-S13R2)
The CI safety relay has one dual-channel input with three electromechanical relay outputs. The
CI safety relay can be configured for automatic or monitored manual reset by adjusting the
switch on the front. The CI safety relay has an SWS output, but does not support SWS input.
The CI safety relay is compatible to the MSR127 monitoring safety relay. The CI safety relay has
the same number of inputs and outputs, the same width, and the same terminal locations as
the MSR127 safety relay.
DI Safety Relay
(Cat.No.440R-D22R2)
The DI safety relay has two dual-channel inputs and two electromechanical relay outputs. In
addition, the DI safety relay has an SWS input and output. The DI safety relay can be set for
automatic or monitored manual reset by adjusting the switch on the front panel. The
configuration switch also sets the AND/OR logic that is applied to the inputs.
DIS Safety Relay
(Cat.No.440R-D22S2)
The DIS safety relay has two dual-channel inputs and four solid-state outputs. Two of the four
solid-state outputs are designed to operate with high-capacitance loads. In addition, the DIS
safety relay has an SWS input and output. The DIS safety relay can be set for automatic or
monitored manual reset by adjusting the switch on the front panel. The configuration switch
also sets the AND/OR logic that is applied to the inputs.
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 safety 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 39 for detailed descriptions on the EMD safety
relay timing functions.
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