Rockwell Automation Publication 440R-UM013G-EN-P - December 2022 19
Chapter 3 Power, Ground, and Wire
Ground the Safety Relay There are no special grounding requirements. Terminal A2 must connect 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 connect 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 connect to safety devices that have mechanical contacts.
The safety relays can accommodate either 1 N.C. or 2 N.C. circuits. Table 3 shows some of the
devices that can connect 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
Table 3 - Safety Devices with Mechanical Contacts
Safety Device
Rockwell Automation
Product Example s
Contact Availability
E-stop push buttons 800F, 800T 1 N.C., 2 N.C., self-monitoring
Tongue-operated interlock switches Trojan™, MT-GD2, Cadet™, Elf™ 1 N.C., 2 N.C.
Guard locking interlock switches 440G-LZ, TLS-Z, TLS-GD2, Atlas™ 1 N.C., 2 N.C.
Non-contact switches with reed relays Ferrogard™, Sipha™, magnetically coded 1 N.C., 2 N.C.
Hinge-operated interlock switches Rotacam™, Ensign, Sprite 1 N.C., 2 N.C.
Limit switches 440P, 802T 1 N.C., 2 N.C.
Trapped key interlocks with electrical
contacts
440T 1 N.C., 2 N.C.
Cable pull switches Lifeline™ 1 N.C., 2 N.C.
Enabling devices GripSwitch 1 N.C., 2 N.C.
Interposing relays 700-HPS 1 N.C., 2 N.C.
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