26 Rockwell Automation Publication 440R-UM012E-EN-P - November 2018
Chapter 3 Power, Ground, and Wire
Figure 19 shows an example wiring connection of the safety outputs to two
contactors. When solenoid type loads are used, use a protective diode to
suppress reverse voltage spikes when the contactors turn OFF.
Figure 19 - Safety Output Connections
Single Wire Safety (SWS)
The GLP safety relay has two single wire safety connections: one input
(terminal L12) and one output (terminal L11). These terminals can only be
connected to other devices that support single wire safety.
Use of the SWS input is determined during configuration. When used, the
SWS input must be ON to lock the safety gate and reset the safety outputs
(turn them ON). When the SWS input turns off, the GLP safety relay turns its
safety outputs OFF and performs an unlock request.
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.
Figure 20
shows an example wiring diagram with SWS input from a GSR DI
safety relay and SWS output connection to a GSR EM expansion in parallel
with a GSR DIS relay. The safety relays must have a common power reference
(24V common).
Figure 20 - Single Wire Safety Connections
Figure 21 shows the characteristics of SWS signal when it is active. It starts
with a 1-ms pulse, followed 600 µs later by a 600-µs pulse. This waveform is
repeated every 4 ms. When inactive, the SWS is 0V.
Figure 21 - SWS Waveform
GLP
X24X14
A1
A2
+24V DC
24V DC Com
K2K1
TIP Connecting two or more L11 terminals together is not allowed.
GLP
L12 L11
A1
A2
+24V DC +24V DC
24V DC Com
DI
L12 L11
A1
A2
EM
L12 L11
A1
A2
DIS
L12 L11
A1
A2
+24V DC +24V DC
L11 and L12
Terminals
24V
0V
10 1.6 2.2 4 ms
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