Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario descargar pdf (Pagina 67)

OC_EnableEOSNotify Library of Routines 6–13

Publication 1747-6.5.3 June 1998

OC_EnableEOSNotify OC_EnableEOSNotify controls whether end-of-scan notification messages are

generated by the scanner.

Syntax:

int OC_EnableEOSNotify(HANDLE handle, int mode);

Parameters:

Description:

There are three types of end-of-scan messages:

End-of-scan messages are generated from the scanner to the API via interrupts after each scan. The scan

rate is controlled by the OC_SetScanTime function and end-of-scan interrupts are generated at the scan

rate. Enabling end-of-scan messages can affect the performance of the application due to the overhead

incurred in processing these interrupts. An alternative method to synchronize with the scanner’s I/O scan

is to monitor the scanner watchdog register, which is incremented at the end of each timed I/O scan. See

OC_GetScannerWatchdogCount.

Parameter: Description:

handle

Must be a valid handle returned from OC_OpenScanner

mode

If mode is:

EOSMSG_ENABLE the scanner generates an end-of-scan

message

after each scan. Use the OC_PollScanner

function

to retrieve end-of-scan messages.

EOSMSG_DISABLE the scanner does not generate End-of-

scan

messages. End-of-scan messages are

disabled

after the scanner has been reset.

This type of message: Is generated after:

OCMSG_EOS_DMDIN a OC_DemandInputScan command has completed

OCMSG_EOS_DMDOUT a OC_DemandOutputScan command has completed

OCMSG_EOS each timed I/O scan

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 67