Rockwell Automation Publication 440C-WD001C-EN-P - June 2015 55
Chapter 11
Multifunction Access Box
This application example shows the setup of a multifunction access box (MAB).
The MAB is a guardlocking interlock with additional features to facilitate access
to a hazard area. In this example, you press a button to request access. The safety
system shuts down the hazard and then unlocks the door. The operator is then
allowed to enter the hazard area. Upon exiting the hazard area, the operator
closes the gate and presses a button to reset the safety system.
Product Overview
Figure 36 - Overview
The MAB has an E-stop button and two illuminated push buttons.
The E-stop button can be used to initiate a Stop Category 0.
The yellow unlock button must be pressed to unlock the gate. Since the buttons
on
the MAB are momentary, an off-delay function block (SOF3) powers the
unlock solenoid for fixed duration. In this example, the duration is 4 seconds and
then relocks the gate. The 4 second duration can be changed in the function
block.
The yellow unlock indicator turns ON and remains ON while the unlock
comm
and is given (in this example, for 4 seconds) so you know that the gate can
be opened during this time.
A blue reset indicator informs you that the safety system is ready to be turned
ON.
Whe
n the blue reset indicator turns ON, the button must be pressed and released
to tur
n the contactors ON.
To Next Page
Loading...
