Rockwell-automation 1747-PCIS API Software - Open Controller Instrukcja Użytkownika Pobierz pdf (Strona 56)

Publication 1747-UM002A-US-P - June 2000

5-2 Configuring I/O Modules

SlotCfg contains information about each slot in the racks. The 1746

I/O PCI Interface supports as many as 31 slots, numbered 0 to 30. Slot

0 is the adapter slot (left slot of rack 1) and is invalid for scanner

functions. Each slot is described by the structure

OCSLOTCFG:

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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