20 Rockwell Automation Publication 440R-UM013E-EN-P - March 2017
Chapter 3 Power, Ground, and Wire
Connect a Power Supply
An external 24V DC power supply source must provide power for safety relays.
To comply with the CE (European) Low Voltage Directive (LVD), a DC
source compliant with safety extra low voltage (SELV) or protected extra low
voltage (PELV) must power the safety relays. Bulletin 1606 power supplies are
SELV- and PELV-compliant.
Figure 7
shows the power supply connections. The DI, DIS, EM, EMD, and SI
safety relays have the power supply connections at the top. The CI safety relay,
which is backward compatible with the MSR127 monitoring safety relay, has
A1 at the top and A2 at the bottom.
Figure 7 - Power Supply Connections
Safety Inputs
GSR relays can be connected to the following devices:
• Devices with mechanical contacts
• Devices with OSSD output
•Safety mats
• Safedge™ safety edges
Devices with Mechanical Contacts
The GSR family of safety relays can be connected to safety devices that have
mechanical contacts. The relays can accommodate either 1 N.C. or 2 N.C.
circuits. Table 2 on page 21
shows some of the devices that can be connected to
safety relays.
Connect +24V DC
to Terminal A1
Connect 24V
Common to
Terminal A2
Connect +24V DC
to Terminal A1
Connect 24V
Common to
Terminal A2
DI, DIS, EM,
EMD, and SI
CI
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