16 Rockwell Automation Publication 440R-UM010C-EN-P - September 2016
Chapter 3 Power, Ground, and Wire
Safety Devices
Safety Devices with Mechanical Contacts
Input devices with mechanical contact outputs, such as emergency stop
buttons and tongue interlock switches, use both a safety input terminal and a
test pulse output terminal.
When safety devices are connected via test outputs to an input circuit on the
GLT safety relay, wire length must be 100 m (300 ft) or less.
For the lowest risk levels, the input device uses one channel. As shown in
Figure 8
, one side of the contact is connected to S11 (or S21). The other side of
the contact must be connected to both S12 and S22. The GLT safety relay
detects short circuits from the inputs (S12 and S22) to 24V DC and to 24V
common.
Figure 8 - Connecting a Single-channel Mechanical Contact
Figure 9 - Connecting Mechanical Contacts of a Dual-channel E-stop
When only one dual-channel E-stop button is used, the maximum safety
performance rating is Cat 4 PLe and SIL CL3.
Figure 10 - Connecting Mechanical Contacts of a TLS3-GD2 Interlock Switch
S12 S22
GLT
Safety
Device
S11
S21
S12 S22
GLT
S11
S21
Safety
Gate
12
22 34
11 21
33
A1
A2
42
41
52
51
S12 S22
GLT
S11
S21
TLS3-GD2
To Next Page
Loading...
Need help?
General
