IFdtCommunication::SequenceStart() method information

M&M FDT 1.2.1 Online Specification
IFdtCommunication::SequenceStart() method information

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4.5.3.7 IFdtCommunication::SequenceStart()

This method can be called in the states:

HRESULT SequenceStart (
[in] FdtXmlDocument fieldbusFrame,
[out, retval] VARIANT_BOOL* result
);

Description:

Starts the execution of a communication sequence at the controller. The communication sequence breaks on error. The communication results are accessible by the according response function calls.

Parameters:

fieldbusFrame

Fieldbus-protocol-specific information starting a sequence. The structure is specified by a fieldbus specific schema e.g. like FDTHARTCommunicationSchema or FDTProfibusCommunicationSchema

Return Value:

result

TRUE Communication sequence started FALSE Communication sequence could not be started

Behavior:

Starts the communication by executing the pending requests without any interruptions. The method returns without waiting for a result so that the calling application will not be blocked. The communication sequence breaks on error. The communication data or errors are accessible by the according response events OnTransactionResponse().

Comments:

The default implementation is to hand down the function call through all communication components. Only the last communication component can decide whether it supports the functionality or not.

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Last updated 2015-02-05 15:17
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