Rockwell Automation Publication 440R-UM013F-EN-P - July 2021 23
Chapter 3 Power, Ground, and Wire
Figure 12 - Example Connections to Safety Mats
Because the safety mats are parallel plates, they have a significant capacitive
effect. The larger the mat, the more capacitance. If the capacitance is too large,
the safety relay does not function properly. See Capacitance Effect on page 61
for further information.
Safedge Safety Edges
Some of the Allen-Bradley Guardmaster Safedge pressure sensitive safety
edges (only profiles 0110N, 0110R, and 1610N) can be connected to CI, DI, DIS,
and SI safety relays. Figure 13
shows how Safedge edges are constructed of
conductive rubber with two embedded wires that run the length the edge. Each
wire forms a channel for the GSR safety relay. When the edge is compressed, a
low resistance is created between the two channels. The Safedge edge must be
constructed with four wires (two wires exit each end). See publication
440F-UM002
for further information on the Safedge edges.
Figure 13 - Safedge Operating Principle
Figure 14 on page 24 shows the typical wire connections. With the proper
connection, GSR safety relays detect the compression of the edge and turn off
their outputs. With no pressure on the edge, the GSR outputs can be turned
back on with a reset signal.
S11 S21 S22 S12 S42 S32S11 S21 S22 S12 S11 S21 S22 S12 S42 S32
Mat 1
Input 1
Input 1 Input 2
Pulse
Testing
Outputs
Pulse
Testing
Outputs
CI and SI
DI and DIS
Input 1 Input 2
Pulse
Testing
Outputs
DI and DIS
Mat 1
Mat 2 Mat 1
EM Device
Older Allen-Bradley Guardmaster MSR relays could be tickled by tapping on the
safety mat, which generated fast cycles. This activity caused the relay to fault
because the fast cycles violated the recovery time specification. GSR safety relays
have a 20 ms recovery time, so this fault is not likely to occur.
IMPORTANT Only Safedge profiles 0110N, 0110R, and 1610N can be used with the GSR
safety relays.
IMPORTANT For fault detection purposes, GSR safety relays must be configured for
monitored manual reset when connected to Safedge safety edges.
Wires on
Both Ends
Compression
Creates a Low
Resistance from
Ch1 to Ch2
Flexible Wire
Cores
(Ch1 and Ch2)
Conductive
Rubber
Non-conductive Rubber
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