Echelon FTXL - Manual (Page 154)

142 Neuron C Syntax for the Model File
specified. In this case, each range modification pair is delimited by the ASCII
vertical bar character '|'. To specify no range modification for a member of a
structure (that is, revert to the default for that member), encode the field as
'|'. Use the same encoding for structure members that cannot have their
ranges modified due to their data type. The '|' encoding is only allowed for
members of structures.
Whenever a member of a structure is not a fixed or floating-point number, its
range cannot be restricted. Instead, the default ranges must be used.
In the case of an array, the specified range modifications apply to all
elements of the array. For example, to specify a range modification for a 3-
member structure where the second member has the default ranges, and the
third member only has an upper limit modification, the range modification
string is encoded as: "n:m||:m;". Positive values for range modifications and
their exponents (if any) are implicit, while negative numbers and negative
exponents must be explicitly designated as such with a preceding negative
sign '-' character. Floating-point numbers use a decimal point '.' character for
the decimal point. Fixed-point numbers must be expressed as a signed 32-bit
integer. Floating-point numbers must be within the range of an IEEE 32-bit
floating-point number. To express an exponent, precede the exponent by an
'e' or an 'E' and then follow with an integer value.
A range modification string provided in the instantiation of a CP family
member overrides any range modification string provided in the declaration
of the CP family.
The Configuration Property Initializer
The initial-value in the declaration of a CP family is optional. If initial-value is
not provided in the declaration, the default value specified by the resource file is
used. The initial-value given is an initial value for a single member of the family,
but the LonTalk Interface Developer utility replicates the initial value for each
instantiated family member. See
Network Variable and Configuration Property
Declarations on page 68 for more information about initializers.
Initialization for a CP family member is performed according to the following
rules:
1. If the configuration property is initialized explicitly in the instantiation,
then this is the initial value that is used.
2. If the configuration property is initialized explicitly in the CP family
declaration, then the family initializer is used.
3. If the configuration property applies to a functional block, and the
functional profile that defines the functional block specifies a default
value for the associated configuration property member, then the
functional profile default is used.
4. If the configuration property type for the configuration property defines a
default value, then that default value is used as the initial value. This
rule does not apply for a configuration property type that is type-
inheriting; see Inheriting a Configuration Property Type on page 38 for
more information.
5. If no initial value is available from any of the preceding rules, a value of
all zeros is used.