Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario descargar pdf (Pagina 50)

5–2 Configuring I/O Modules

Publication 1747-6.5.3 June 1998

struct {

BYTE mix; /* Module I/O Mix value */

BYTE type; /* Module Type */

BYTE InputSize; /* number of inputs in bytes */

BYTE OutputSize; /* number of outputs in bytes */

WORD M0Size; /* size of M0 file in words */

WORD M1Size; /* size of M1 file in words */

WORD GSize; /* size of G file in words */

WORD *GData; /* pointer to array of length GSize words */

char *Name; /* pointer to module name string */

} OCSLOTCFG;

You can specify a module by name or by mix and type. You only specify G data if

the module uses G files (such as the 1747-SN). If the

Name pointer is NULL,

OC_CreateIOConfiguration uses

mix and type to identify the module. See page 4

for the

mix and type values. OC_CreateIOConfiguration supplies the InputSize,

OutputSize, M0Size, M1Size, Gsize, and Name fields.

Name points to a string containing a valid module name, the module name

identifies the module. OC_CreateIOConfiguration supplies the

mix, type,

InputSize, OutputSize, M0Size, M1Size, and Gsize fields.

Initialize empty slots and slot 0 with a

mix value of 0xFF and a type value of 0xFF.

If the module is not in the internal database, OC_CreateIOConfiguration doesn’t

alter the OCSLOTCFG.

To support modules not included in the internal database of modules, the host

application can initialize the

mix, type, InputSize, OutputSize, M0Size,

M1Size, and GSize before downloading the I/O configuration to the scanner. See

the I/O module’s user manual to determine the proper configuration information.

After the OC_CreateIOConfiguration and OCGetIOConfiguration functions return,

the I/O configuration structure must be checked for installed modules with G files.

If the Gsize field of a non-empty slot configuration is not zero, then the module

contains a G file. If the module contains a G file, initialize GData to point to an

array of Gsize words to be loaded into the module during scanner configuration.

See the I/O module’s user manual to determine the proper G file data.

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 50