User's Manual

Rockwell Automation Publication 440G-UM004C-EN-P - August 2020 37
Chapter 7 Application Examples
Wire to DG Safety Relay
The 440G-MZ safety switch can be used in GuardLink® applications. The
GuardLink system:
• Is designed to operate with Power to Release switches.
• Uses taps to connect a series of devices to one relay.
• Provides control and status information between the machine control
system and the safety system.
Figure 15
shows four 440G-MZ safety switches that are connected on two
GuardLink circuits from one DG safety relay. The DG safety relay can
accommodate up to 32 devices on each input. The devices can be a mix of many
different safety devices. When guard locking devices are included in the
GuardLink system, the lock/unlock command must come from the machine
control system through the 440R-ENETR module.
Figure 15 - DG Safety Relay with 440G-MZ Safety Switch Schematic
See publication 440R-UM015 for further details.
L1
L2 L3
M
K1
K2
K1
K2
Status
Control
Control
Machine
Control
System
24V DC Com
S32 X3
X2
X4
14S42
13 23
24
S11
S22
X1
A2
DG
440R-DG2R2T
+
440R-ENETR
A
B
C
Status
TIME
0
A1
S12
S21
440S-PFSD
440S-PFSD
440S-PFSD 440S-PFSD
889D-F5NCDM-X 889D-F5NCDM-X
889D-F5NCDM-X889D-F5NCDM-X
440G-MZS20*NR* 440G-MZS20*NR*
440G-MZS20*NR* 440G-MZS20*NR*
+24V DC, Class 2, PELV
Brown
Blue
White Black
889D-F4NE-X
889D-F4NE-X
Brown
Blue
White Black