Rockwell-automation 1747-PCIS API Software - Open Controller Manual de usuario descargar pdf (Pagina 35)

Publication 1747-UM002A-US-P - June 2000

Developing Applications 3-3

The API has a defined constant specifying the total number of bytes

available for the three segmenters This constant is specified as:

OCSEGMENTSIZELIMIT

Once the scanner has been initialized properly it cannot be

re-initialized unless it is reset with the OC_ResetScanner function.

Once the scanner is reset, scanner communications are disabled again

until the scanner is initialized. The host application can call

OC_GetScannerStatus to determine if the scanner has been initialized.

If the scanner was previously initialized, the host application can

retrieve the initialization partition information with the

OC_GetScannerInitInfo function instead of resetting and re-initializing

the scanner.

Configure the scanner

To access I/O modules in a rack, you must define the rack sizes and

installed module types for the scanner. You can either create a specific

configuration or read the current configuration. The scanner cannot

be set to Scan mode until it has been configured (received a valid

scanner configuration).

If the scanner is in Scan mode and the host application has not

downloaded a scanner configuration, the scanner has already been

configured. To control I/O, use OC_GetIOConfiguration to retrieve

the current scanner configuration.

The application can read the current I/O configuration with the

OC_GetIOConfiguration function. If the scanner is not in Scan mode,

this function returns the current scanner configuration which can be

downloaded to the scanner using OC_DownloadIOConfiguration.

If the application requires a specific I/O configuration, the application

can define the I/O configuration structure with the rack sizes and

module types installed in each slot. The application passes this

configuration structure to OC_CreateIOConfiguration.

OC_CreateIOConfiguration returns a scanner configuration that can be

downloaded to the scanner. For more information, see chapter 5.

Once a valid scanner configuration is successfully downloaded to the

scanner via OC_DownloadIOConfiguration, the application can set the

scanner to Scan mode and control I/O.

Both OC_CreateIOConfiguration and OC_GetIOConfiguration build

the configuration data from an internal database of supported I/O

modules.

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 173 174

Sin comentarios

Rockwell-automation 1747-PCIS API Software - Open Controller Manual de usuario Pagina 35