User manual

Computer Gateway User Manual A-2 5/96
A.2.1
A.2.1 Custom Data Segment Heading
The Custom Data Segment Heading consists of the word CUSTOM followed by three
optional attribute assignments, which change the default values for Class, Access, and
Build Visible for this CDS. Either the standard or heading-specified default values are
overridden by any individual parameter attribute assignments. Always use the default value
for Class when preparing a CDS to be used with an ACIDP or CRDP.
A.2.2 Custom Data Segment Parameters
Each CDS parameter has a heading that begins with the word PARAMETER followed by
an up-to-8 character name, an optional data type specifier, and an optional character string
to be displayed by the DEB. This is followed by a set of optional attribute assignments.
Data Type can be Number, Time, Logical, Enumeration, String, or Data Point Identifier (or
single-dimension arrays of any of these). The default data type is Number.
The parameter attributes are
ACCESS—The Access Attribute defines write access restrictions for the parameter.
Read access is never restricted. The access levels are View Only, Operator, Supervisor,
Engineer, Program, and Entity Builder. The standard default access level is Engineer.
For additional information on parameter access-level significance, see the System
Control Functions manual.
BLD_VISIBLE—This determines whether or not a preset parameter value can be changed
at point-build time. The standard default value is Build Visible.
VALUE—The data type of the constant expression must match the parameter's assigned
(or default) type. If no Value is specified and Not Bld_Visible is specified, a default
value is assigned. The default values vary by data type as specified in the Control
Language/AM Reference Manual.
EU—The Engineering Units attribute is a character string that is displayed with other
point-parameter information. The default is blanks.
CLASS—For an ACIDP or CRDP CDS, always use the standard default value of
General.