Rockwell Automation 1747-PCINT API Software for 1746 I/O - Manual (Page 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.
If 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.