Allen-Bradley Guardmaster - Page 21

Rockwell Automation Publication 440R-UM013E-EN-P - March 2017 21
Power, Ground, and Wire Chapter 3
Table 2 - Safety Devices with Mechanical Contacts
Figure 8 shows the typical connections for devices with 2 N.C. mechanical
contacts. One side of each contact is connected to a pulse-testing outputs S11
and S21. The other side is connected to an input terminal. The CI and SI
safety relays only have one set of input terminals. The DI and DIS safety relays
have two sets of input terminals. The DI and DIS safety relays can operate with
only one device that is connected to either input or with devices that are
connected to both inputs.
Figure 8 - Example Connections to 2 N.C. Mechanical Contacts
Figure 9 shows the typical connections for devices with 1 N.C. mechanical
contact. One side of the contact is connected to a pulse-testing output S11.
The other side is connected to two input terminals. The CI and SI safety relays
only have one set of input terminals. The DI and DIS safety relays have two
sets of input terminals. The DI and DIS safety relays can operate with only one
device that is connected or with devices that are connected to both inputs.
Figure 9 - Example Connections to 1 N.C. Mechanical Contact
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.
Noncontact 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.
DI and DIS
Pulse
Testing
Outputs
S11
S21
Device 1 Device 2
S12
Input 2Input 1
S22
S32
S42
CI and SI
Pulse
Testing
Outputs
S11
S21
Device 1
S12
Input 1
S22
DI and DIS
Pulse
Testing
Outputs
S11
S21
Device 1 Device 2
S12
Input 2Input 1
S22
S32
S42
CI and SI
Pulse
Testing
Outputs
S11
S21
Device 1
S12
Input 1
S22