1.3.63 program (verb): to design, write, and test user programs.
1.3.64 program organization unit: function, function block, or program.
NOTE This term may refer to either a type or an instance.
1.3.65 real literal: literal representing data of type REAL or LREAL.
1.3.66 resource: language element corresponding to a “signal processing function” and its “man-
machine interface” and “sensor and actuator interface functions”, if any, as defined in IEC 61131-1.
1.3.67 retentive data: data stored in such a way that its value remains unchanged after a power
down / power up sequence.
1.3.68 return: language construction within a program organization unit designating an end to the
execution sequences in the unit.
1.3.69 rising edge: the change from 0 to 1 of a Boolean variable.
1.3.70 scope: that portion of a language element within which a declaration or label applies.
1.3.71 semantics: the relationships between the symbolic elements of a programming language and
their meanings, interpretation and use.
1.3.72 semigraphic representation: representation of graphic information by the use of a limited set
of characters.
1.3.73 single data element: data element consisting of a single value.
1.3.74 single-element variable: variable which represents a single data element.
1.3.75 step: situation in which the behavior of a program organization unit with respect to its inputs
and outputs follows a set of rules defined by the associated actions of the step.
1.3.76 structured data type: aggregate data type which has been declared using a STRUCT or
FUNCTION_BLOCK declaration.
1.3.77 subscripting: mechanism for referencing an array element by means of an array reference
and one or more expressions that, when evaluated, denote the position of the element.
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