Coordinate  -  Transition, CoorØ+   (MM->2->5)

These coordination parameters are MIB's  associated with the Pat#.  The Transition values along with the Correction mode (MM->2->1) determine the offset correction method (LONG, SHORT/LONG or DWELL) defined in NTCIP 2.5.2 COORD CORRECTION MODE PARAMETERS.

In the above menu, Pat# 1 will use a 17% long-way correction if the correction mode is either LONG or SHORT/LONG.  If the SHORT/LONG mode is used, then Pat# 2 will allow the controller to choose a 12% short-way or a 22% long-way correction (whichever gets the controller back in step the quickest).  Even if the Correction mode is LONG or SHORT/LONG, Pat#3 will use the DWELL method to rest in the coordinated phase 60" each cycle until the controller gets in step.

The SHORT/LONG method is the most efficient coordination method because it allows the controller to make a determination of "the shortest path" to get in step.  However, because the controller can shorten each split by the % value shown in this menu, you can run into situations where the min times on a phase cannot be satisfied by the shortened split.  No Short Ø's allow you to exclude up to 4 phases from short-way transition on a pattern-by-pattern basis.  In the menu above,  the controller will not apply short-way to phases 1 and 5 for Pat# 1, but will shorten these phases for the other patterns shown.

The following illustrations point out the difference between short-way and long-way offset correction.