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LINC Programming Reference Manual - Public Support Login - Unisys

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Railroad Diagram Syntax<br />

Required Items<br />

An item is required if there is no alternative path through the diagram.<br />

DDDD DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD4<br />

Optional Items<br />

Loops<br />

Items listed vertically below the main line of the diagram indicate optional items.<br />

DDDD DDDDDBDDDDDDDDDDDDDDDDDDDDDDDBDDDDDDDD4<br />

3 3<br />

CDDD DDD4<br />

3 3<br />

@DDD DDDY<br />

The following statements are valid constructions from the previous diagram.<br />

<br />

<br />

<br />

A loop indicates repeated access to part of a railroad diagram.<br />

Note: There may be limits (such as the number of items allowed) associated with<br />

loops. Limits are included with the description of the command.<br />

ZDDD?<br />

ZDDDDDDDDDY @DDDDDDDDDDDDDD?<br />

ZDDDDDDDDDDDDDDDDDDDDDDDDDDDD?<br />

3 3<br />

DDDDDDDDDDDDDDDDDDDDDADDDBDD DDBDDDADDDDD4<br />

3 3<br />

@DD DDY<br />

The following statements may be constructed from this diagram.<br />

<br />

<br />

<br />

A loop must be used in the direction indicated by the arrow. If there is no arrow, read<br />

left-to-right.<br />

B-2 v

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