Rockwell Automation Publication 440C-WD001C-EN-P - June 2015 17
Chapter 3
Safety Mats - Two Zones
This application demonstrates two zones using safety mats and E-stop push
buttons. Each zone is controlled by a safety mat and an E-stop push button. In
this example, a sequential manufacturing process has two zones. If an operator
enters the first zone, that zone stops while the second zone continues to function.
If an operator enters zone 2, then both zones 1 and 2 must stop. An indicator
lamp shows which zone is not operating, and the user is allowed to enter for
normal production type operations.
The safety mats for each zone can be single mats or multiple mats that are
c
o
nnected in series. The safety mats must be connected to pulse tested outputs to
operate properly with the CR30 safety relay. In this example, the Zone 1 mats use
pulses from 12 and 13 and Zone 2 uses pulses from 16 and 17. The maximum size
of the mat system is 65 square meters for each zone.
The two E-stop buttons use the same test pulses, from terminals 14 and 15 - this
arr
angement is preferred. Alternatively, the E-stops can be powered directly by
the 24V DC supply, but powering directly from 24V does not provide
cross-channel fault detection.
Note: The outputs of the CR30 safety relay are driving 100S contactors.
Due
to the inrush current limitations of the CR30 safety relay, it can only
switch the 100S-C09EJ contactors. The CR30 safety relay cannot switch
the C43EJ contactors.
Product Overview
Figure 7 - Overview
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