Rockwell Automation Publication 440R-UM013F-EN-P - July 2021 19
Chapter 3 Power, Ground, and Wire
Ground the Relay There are no special grounding requirements. Terminal A2 must be connected
to the common of a 24V supply.
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 safety 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 20 shows some of the devices that can be connected to
safety relays.
14, 24 Safety Outputs - OSSD DIS
34, 44 Safety Outputs - OSSD for capacitive loads DIS
17/18, 27/28, 37/38, 47/48 Safety Outputs, Delayed - electromechanical relay EMD
Table 1 - Terminal Assignments and Functions
Terminal Function Applies To
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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