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Section 3 Parameter Interface
Data Type
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Recommendations for the following properties will be presented:
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•
•
•
Parameter for Control Modules and Diagrams
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•
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Data Type
It is recommended to avoid structured data types in Function Block Types, since it is
not possible to connect the components of a structured data type directly to other
function blocks.
If a component of a structured parameter is connected to another Function Block in
FBDs, this must be made via a local variable. However, this kind of connections
between two function blocks will not appear graphically, even though they are in
fact connected.
When using the Diagram editor, a structured parameter component may be
connected to an object, using that component data type by directly addressing it as
struct.component
. For example, a variable of type real can be connected to the
value component of an object parameter of type RealIO.
Attributes
Control modules and diagrams do not have attributes on their parameters, (only on
variables) since no local copy of the connected variable is made.
For function blocks the entries of the attribute column can be group into three
categories:
•
retain or cold retain
•
nosort
Summary of Contents for AC 800M
Page 2: ......
Page 3: ...AC 800M Library Object Style Guide System Version 6 0...
Page 12: ...Related Documentation About This User Manual 12 3BSE042835 600...
Page 18: ...Naming Convention Section 1 Libraries 18 3BSE042835 600...
Page 108: ...SIL Mark Restrictions Section 6 Program Code Issues 108 3BSE042835 600...
Page 116: ...Standard Library Parameters Appendix A Names and Abbreviations 116 3BSE042835 600...
Page 119: ......