Rotary Trailing Split

Note:  This option is only visible when Engine Type is set to Rotary.

The Trailing Split function provides a means by which the spark timing of leading and wasted spark plugs can be individually adjusted.
The 3D Split Table (shared with Individual Cylinder Trim Table 8) adjusts the timing offset in eccentric shaft degrees of the trailing spark relative to the leading spark.  Positive numbers cause the trailing spark to happen before (advanced) the leading spark.  Negative numbers cause the trailing spark to happen after (retarded) the leading spark.  It is more common to use negative numbers in this table.
The main Ignition Table sets the firing point of the leading spark in actual eccentric shaft degrees.
The 3D Split Table uses the same Load Axis as the main Ignition Table.  Table Load Start specifies the value at which the first load table element is centered.  Table Load Increment specifies the difference between each of the tables load elements.  Table RPM Start specifies the value at which the first RPM table element is centered.  Table RPM Increment specifies the RPM difference between each of the tables RPM elements. 
The current Trailing Split angle can be viewed in the runtime values area of PCLink under the Ignition tab.

Click on PCLink screen-shot to view "full screen"

Setup:

If you want the trailing spark to occur AFTER the leading spark, then the Split Table should have negative (-ve) numbers.  The numbers in the table will be how long after the leading spark (in degrees) you want the trailing spark to occur.

Example:
If the main ignition table has an entry of 20 at a particular RPM / Load point, the leading spark will occur at 20 degrees Before TDC.  If at the same RPM/Load point the Split Table has an entry of -6, the trailing spark will occur at 14 degrees Before TDC (ie 6 degrees after the leading spark).

If the main ignition table has an entry of 17 at a particular RPM/Load point, the leading spark will occur at 17 degrees Before TDC.  If at the same RPM/Load point the Split Table has an entry of 4, the trailing spark will occur at 21 degrees Before TDC (ie 4 degrees before the leading spark).