A postprocessor $PP entry controls the output of the motion block information. A "motion block" is just a single line of NC code.
The following example is considered a motion block:
The motion block definition is processed and a line of NC code is produced when a specific drawing entity is processed. The general format of a motion block definition control line is:
# $PP ENTRY # $PP ENTRY = $BLOCKTYPE
The $PP ENTRY portion of the definition can be any other valid entry in the $PP file except another motion block definition. As many $PP entries as will fit on one line can be placed in a motion block definition. Each item must be separated by "#", for formulation of the motion block.
There are two predefined $PP entries, "PA" and "PB", which show the placement of the text statements with "A" switches and "B" switches.
The $BLOCKTYPE portion of the motion block definition is one of the following:
Each of the $BLOCKTYPE strings corresponds to a geometric entity that is read from the .DXF file and processed by the postprocessor. The above example tells the post that when a line is read from the input .DXF file some geometric entries such as length, start point, etc. are computed from the lines geometry. Then the "$LINE1.1" motion block is output to the NC file. This output consists of each of the $PP entries defined on the left of the '='(except for codes which have been disabled the 'D' switch).