 | M&M FDT 1.2.1 Online Specification |
Interfaces and Methods - Schemas - FDT Specification - Quicklinks - Abbreviations
4.1 Overview of the FDT interfaces
4.2 FDT Objects
4.2.1 FDT Object Model
4.2.2 DTM State Machine
4.10 General Concepts
4.10.1 Task Related FDT Interfaces
4.10.2 Return Values of Interface Methods
4.10.3 Dual Interfaces
4.10.4 Unicode
4.10.5 Asynchronous vs. Synchronous Behavior
4.10.6 ProgIds
4.10.7 Slave Redundancy
4.10.8 Field Bus Scanning and DTM Assignment
4.10.2 Return Values of Interface Methods
Interface methods indicate success or failure of a method call by well defined return values (marked as [out, retval]). COM errors (HRESULT) must not be used to return FDT function related errors, except it is stated in the specification. If no return value is defined (e.g. for all Event methods) it is assumed that the method always succeeds.
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Last updated 2015-02-05 15:17
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