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Appendix B
Railroad Diagram Syntax
Overview
In Section 1, the syntax of LINC logic commands is illustrated with railroad diagrams.
Railroad diagrams are read left-to-right, or in the direction indicated by an arrowhead. The
end of the diagram is indicated by a vertical bar. Continuation from one line to another is
indicated by a number at the end of a line and a corresponding number at the beginning of
another line.
Information contained in italics is variable information to be supplied. Further
information about these values (called metatokens) will follow the syntax diagram, or can
be found in ‘‘Conventions for Syntax Diagrams’’ , in this manual.
Otherwise, enter everything else exactly as it appears.
Sample
A sample railroad diagram and an explanation of its parts follows.
DD DDDDDD DDDDD
DDBDDDDDDDDDDDDDDDDDDDDDDDDDDDBDDDDBDDDDDDDDDDDDDDDDDDBDDDD
3 3 3 3
@D DDDDD DDY @D DDDDD DDY
DDDD DDDDDDDDDDDDDDDDDD4
The following are statements that may be constructed from this diagram.
v B-1