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As promised, below is an article detailing the interlocking of two D-Series operators. 

Interlocking access control devices can be extremely useful, especially when it comes to high-security applications.  For those of you who might not know exactly what interlocking is, it basically means that one device will not be allowed to operate if the other device is in a certain state.  An example would be interlocking a swing gate with a traffic barrier, where the barrier will not be able to raise unless the swing gate is in the fully closed position, creating sort of a vehicle trap.
Let’s look at how one would interlock a D10 sliding gate motor with a SECTOR high-volume traffic barrier.  In this example, the SECTOR cannot raise when the gate with the D10 is open or opening and the D10 gate cannot open when the SECTOR is raising or raised, thus creating an effective vehicle trap.

After connecting the two controllers in the way illustrated by the diagram above, proceed to set the following configurations on BOTH controllers:
SAFETY>
              EXTERNAL GATE STATUS INDICATION>
                                                                                        INDICATOR OUTPUT = XIO
Set the Indicator Output to be ON only for Closed, and off for all other indications (open, partly open, partly closed, etc.)
You now have an interlocking system.  As soon as one operator starts opening, XIO will deactivate, in turn breaking the Lck connection and enabling Holiday Lockout – meaning that all inputs for the other operator are inhibited.  When the operator closes again, the Lck connection to common will be re-made.
Older operators can of course also be interlocked, but requires the use of a CP78 Multi-LED driver.