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Glossary
unlocated
variable
Unlocated variables are not allocated a state RAM address. They therefore do not
occupy any state RAM addresses. The value of these variables is saved in the
internal system and can be changed using the reference data editor. These
variables are only addressed using their symbolic names.
Signals requiring no peripheral access, e.g. intermediate results, system tags etc.,
should be primarily declared as unlocated variables.
V
variables
Variables are used to exchange data within a section, between several sections and
between the program and the PLC.
Variables consist of at least one variable name and one data type.
If a variable is assigned a direct address (reference), it is called a located variable.
If the variable has no direct address assigned to it, it is called an unlocated variable.
If the variable is assigned with a derived data type, it is called a multi element
variable.
There are also constants and literals.
W
warning
If a critical status is detected during the processing of a FFB or a step (e.g. critical
input values or an exceeded time limit), a warning appears, which can be seen using
the Online → Event Viewer...menu command. For FFBs, the ENO remains set to
"1".
WORD
WORD stands for the data type "bit sequence 16". Entries are made as base 2
literal, base 8 literal or base 16 literal. The length of the data element is 16 bits. A
numerical value range can not be assigned to this data type.
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