10 Rockwell Automation Publication 440R-UM013F-EN-P - July 2021
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 safety monitoring relay. The CI
safety relay has the same number of inputs and outputs, the same width, and
the same terminal locations as the MSR127 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 relay configure the
functionality and duration of the delay and jog.
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