20 Rockwell Automation Publication 440R-UM013F-EN-P - July 2021
Chapter 3 Power, Ground, and Wire
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 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
Devices with OSSD Output
Devices, such as the GuardShield™ safety light curtains, SafeZone™ laser
scanners, SensaGuard™ interlock switch, TLS-Z and 440G-LZ guard locking
switches, and Bulletin 442G Multifunction Access Box (MAB), have current-
sourcing PNP semiconductor outputs (OSSD). Devices with OSSD send their
own pulse-tested safety signals through their outputs. These devices do not
Table 2 - 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.
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.
S11 S21 S12 S22 S32 S42S11 S21 S12 S22
Device 1
Device 1
Device 2
Input 1 Input 1 Input 2
Pulse
Testing
Outputs
Pulse
Testing
Outputs
CI and SI
DI and DIS
S11 S21 S12 S22 S32 S42S11 S21 S12 S22
Device 1
Device 1
Device 2
Input 1
Input 1 Input 2
Pulse
Testing
Outputs
Pulse
Testing
Outputs
CI and SI
DI and DIS
To Next Page
Loading...
Need help?
General
