1624 HEIDENHAIN Technical Manual MANUALplus 620
Reference for
syntax elements
BNF notation The following specifies the individual syntax elements in BNF notation. The
individual NC blocks are listed in alphabetical order.
A specified syntax element is identified by a name in italics.
Individual characters are enclosed in single quotation marks; entire code
words are plain text and are not enclosed in single quotation marks.
A single simple expression is enclosed in square brackets [ ], whereas a
multiple expression is enclosed in braces { }. Two expressions separated by
the "|" symbol indicate alternative options.
Expressions may contain letters, numbers, and symbols.
uppercase := 'A'...'Z'
lowercase := 'a'...'z'
digit := '0'...'9'
index := digit { digit }
number := [ '+' | '-' ] digit { digit } ['.' digit { digit }
literal := '"' { uppercase | lowercase | digit | symbol } '"'
name := uppercase { uppercase | lowercase | digit | '$' | '#' | '_' }
Context elements The following elements can only occur within the context of an NC block.
Q parameters
A Q parameter can be addressed directly or indirectly via another Q parameter.
q-number := Q index
q-reference := Q REF Q index
q-parameter := q-number | q-reference
SQL parameters Q parameters and system parameters can be bound to the column name of a
table.
Definition
system-group := ID index
system-number := NR index
system-index := IDX index
system-parameter := system-group system-number system-index
sql-parameter := q-parameter | system-parameter
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