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GuardLink System Design
The design of a GuardLink circuit requires knowledge of the power
requirements of the input devices and the length of the link cables. A voltage
drop occurs across each tap. The cumulative voltage drop determines the
number of taps that can be included in the circuit.
The GuardLink system makes it easy to monitor multiple devices over long
distances when multiple access points to the hazardous area are required.
The DG safety relay monitors the GuardLink system. The GuardLink system
can provide diagnostic information on each access point back to the machine
control system.
The GuardLink system must be designed considering these factors:
• Voltage available at each node
• Current flowing through each node • Power requirements for each tap
• Cable lengths
The GuardLink system is designed to operate on a 24V DC system. The
maximum continuous current on the link circuit must not exceed 4 A; the taps
and link cables are rated for 4 A continuous.
Figure 6 on page 24
identifies three tap connections: T1, T2, and T3. The
voltage and safety signals are sourced to connection J1. J2 is connected to
downstream taps. J3 of each tap is connected to a safety device.
Rockwell Automation Publication 440R-UM015C-EN-P - April 2018
Chapter
• Wire size
• Safety device power requirements
2
23
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