Table of Contents
Table 2 - Safety Devices with Mechanical Contacts
Safety Device
E-stop push buttons
Tongue-operated interlock switches
Guard locking interlock switches
Noncontact switches with reed relays
Hinge-operated interlock switches
Limit switches
Trapped key interlocks with
electrical contacts
Cable pull switches
Enabling devices
Interposing relays
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
Device 1
S11
S21
S12
S22
Pulse
Input 1
Testing
Outputs
CI and SI
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
Device 1
S11
S21
S12
S22
Pulse
Input 1
Testing
Outputs
CI and SI
Rockwell Automation Publication 440R-UM013E-EN-P - March 2017
Power, Ground, and Wire
Rockwell Automation
Product Example s
800F, 800T
Trojan™, MT-GD2, Cadet™, Elf™
440G-LZ, TLS-Z, TLS-GD2, Atlas™
Ferrogard™, Sipha™, magnetically
coded
Rotacam™, Ensign, Sprite
440P, 802T
440T
Lifeline™
GripSwitch
700-HPS
Device 1
Device 2
S11
S21
S12
S22
S32 S42
Pulse
Input 1
Input 2
Testing
Outputs
DI and DIS
Device 1
Device 2
S11
S21
S12
S22
S32 S42
Pulse
Input 1
Input 2
Testing
Outputs
DI and DIS
Chapter 3
Contact Availability
1 N.C., 2 N.C., self-monitoring
1 N.C., 2 N.C.
1 N.C., 2 N.C.
1 N.C., 2 N.C.
1 N.C., 2 N.C.
1 N.C., 2 N.C.
1 N.C., 2 N.C.
1 N.C., 2 N.C.
1 N.C., 2 N.C.
1 N.C., 2 N.C.
21
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