Rockwell Automation 440R-D22R2, User Manual

Page: 22 / 90

22 Rockwell Automation Publication 440R-UM013F-EN-P - July 2021
Chapter 3 Power, Ground, and Wire
Figure 11 - Example Connections to Device with Cascaded and Non-cascaded OSSD Devices
GSR safety relays cannot detect short circuits of the OSSD device outputs. The
PWR/Fault status indicator of your GSR safety relay remains steady green. The
device with the OSSD outputs must detect short circuits of its own OSSD
outputs. When detected, the device must shut off both OSSD outputs and go to
a faulted state. A status indicator must inform you that the OSSD is faulted.
Safety Mats
Guardmaster™ (and similar) safety mats can be connected to safety relays.
These mats use parallel metal-plate technology. Stepping on the mat shorts the
top metal plate to the bottom metal plate. With the proper connections, safety
relays detect the presence of an object on the mat and turn off their outputs.
With no presence on the mat, safety relays turn on their outputs.
When changing the function from mechanical switches or OSSDs to safety
mats, GSR safety relays must go through the complete configuration process.
Figure 12 on page 23 shows the typical connections for safety mats. You notice
the reverse of the wiring between a device with 2 N.C. contacts and the safety
mat.
When a safety mat is used, safety relays cannot detect short circuits between
the inputs or between the inputs and 24V DC. These conditions must be tested
during validation.
IMPORTANT For fault detection purposes, GSR safety relays must be configured for
monitored manual reset when connected to safety mats.
IMPORTANT When using safety mats, the DI and DIS safety relays must be set for AND
logic. If only one mat is used, the second input must be connected with
jumpers or to another safety device. If another safety device is
connected to the second input, the outputs of the safety device must be
ON during configuration and during power-up.
A2
S12
A1
A2
A1
A2
S22 S32 S42 A1
A2
A1 S12 S22
+24V DC
24V Com
A1
A2
A1
A2
A1
A2
A1
A2
A1
A2
A1
A2
A1
A2
Device 1
Input 1 Input 1 Input 2
CI and SI DI and DIS
Device 3
Device 5
Device 1
Device 3
Device 5
Device 2
Device 4
Device 6