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Chapter 1
Overview
14
Reset
The DG safety relay reset function can be applied one of three ways:
• Automatic reset (no connection needed)
• Monitored manual reset by a momentary push button that is connected
to an input terminal
• With an Ethernet interface, the machine control system can initiate the
reset function.
The DG safety relay allows both an input terminal and the machine control
system to perform the monitored manual reset function. The reset signal must
transition from LO to HI and back to LO within a window of 0.25...3 seconds.
The reset occurs on the trailing edge. When using a programmable logic
controller (PLC) to generate the reset signal, use a narrower window
(0.26...2.99 s) for more reliable reset action.
ATTENTION: The reset function must not be used to start or restart the
machine.
In
Figure
2, the DG safety relay has one GuardLink circuit and one safety
device input. The EtherNet/IP interface reports status information to the
machine control system. The DG safety relay monitors the status of the two
output contactors and uses monitored manual reset to energize the contactors.
Figure 2 - One GuardLink Circuit and One Safety Device
EtherNet/IP
interface
Output
monitoring
Rockwell Automation Publication 440R-UM015C-EN-P - April 2018
GuardLink circuit - one tap for each safety device
Safety device (E-stop, mechanical interlock, light curtain,
scanner, OSSD interlocks)
DG safety relay
Monitored
R R
Manual
Reset
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