Automatic control function programming manual ladder language

4.1 Notations Used
The notations used to describe the literal elements of the ladder language are as follows:
Character Function
Literal Elements of Ladder Language
[ ] At most one element between square brackets can be chosen
< > Surround nonterminal elements of the language
{ } n At most n elements between parentheses can be chosen.
REMARK An element not surrounded by < and > is a terminal symbol, a keyword or a
separator.
4.2 Label - Comment
Language element Includes Remark
or or _ Limited to 8 characters
or Limited to 64 characters
4.3 Step
Language element Includes Remark
%M variable with size .W,
%V or % Y
Positive integer on 16 bits
4.4 Literal Elements of Ladder Sequences
4.4.1 Literal Entities Authorised in the Test Part of a Ladder
Language element Includes Remark
Variable % .0 to .7 Example: %V3.0
[]
REMARK The evaluation of and supplies a Boolean result [1|0].
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