Single Wire Safety; Sws Connections - Allen-Bradley Guardmaster GuardLink User Manual

Single Wire Safety

The DG safety relay has the Single Wire Safety capability to expand the safety
function (both input and output).

SWS Connections

The Single Wire Safety (SWS) feature allows a safety relay to expand the safety
function to additional safety relays using one wire, provided all safety relays
have the same voltage supply reference.
The SWS signal is unidirectional. The signal flows from L11 to L12.
There can be many variations and combinations of series and parallel
connections of the SWS. Each L11 terminal can be connected to up to ten L12
terminals.
IMPORTANT Do not connect two or more L11 terminals together.
Figure 33 shows an example wiring diagram with an SWS signal. The SWS can
be connected between the DG safety relay and other relays in the GSR family
(the CI, DI, DIS, EM, EMD, and SI relays). Relay 1 has a series connection to
Relay 2. Relay 2 has a parallel connection to Relays 3 and 4. Relay 4 has a series
connection to Relay 5. The safety relays must have a common power reference
(24V common). In this example, the safety function started by Relay 1 turns
off all other relays if AND logic is applied to L12 on all relays.
IMPORTANT The DG safety relay terminals are marked X2 and X1; which is equivalent to
terminal L12 and L11 on other GSR relays.
Figure 33 - SWS Connection Example
+24V DC +24V DC
A1 A1
GSR Relay 1 GSR Relay 2
DI
L12 L11
A2 A2
SWS
Rockwell Automation Publication 440R-UM015C-EN-P - April 2018
+24V DC +24V DC
A1
GSR Relay 3
DG DG
X1 X2 X1 X2
A2
SWS
24V DC Com (the relays must have a common reference)
Power, Ground, and Wire Chapter 4
+24V DC
A1
A1
GSR Relay 4 GSR Relay 5
EM EMD
L12 L11 L12 L11
A2 A2
SWS
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