Rockwell Automation 1785-Vx0B, D17856.5.9 PLC-5 VME VMEbus Programmable Controllers User Manual - Manual (Page 165)

Sample API Modules
Appendix B
B-7
/* Loop until we timeout or the bits are set. */
for (i=0;
((i<kTIMEOUT_COUNT) && (status->plc540vStatus == kPLC540V_SUCCESS));
i++)
{
read_plc540v_register(baseAddress, kPLC540V_CC_REG,
&cmdctlReg, status);
if (status->plc540vStatus == kPLC540V_SUCCESS)
{
/* Determine if the bit is set. */
if (cmdctlReg & andMask)
break;
}
}
if (i > kTIMEOUT_COUNT)
{
/* Signal that we timed out. */
status->plc540vStatus = kPLC540V_CMDCTRL_WRDY_TIMEOUT;
status->statusCategory = kPLC540V_STATUS;
}
}
/*****************************************************************************
*
* PURPOSE: This function will examine the entire VME memory space to
* locate all the PLC-5/40V’s which are installed.
*
* INPUT: None
*
* OUTPUT: LOCATED_PLC540V_ARRAY_TYPE *plcList will contain the base
* addresses of each located PLC-5/40V. Any entries in this
* array which don’t have a PLC-5/40V will be zero.
*
* PLC540V_STATUS_TYPE *status will contain the final status
* of requesting this function. This status could be and EPC
* or PLC-5/40V value.
*
* RETURNS: Nothing.
*
* EXAMPLE:
* LOCATED_PLC540V_ARRAY_TYPE plcList;
* PLC540V_STATUS_TYPE *status;
* find_all_plc540v_in_VME(plcList, &status);
*
* Copyright Allen-Bradley Company, Inc. 1993
*
****************************************************************************/
void find_all_plc540v_in_VME(LOCATED_PLC540V_ARRAY_TYPE plcList,
PLC540V_STATUS_TYPE *status)
{
/* The current base address which we are examining in VME space. */
UWORD baseAddress;
/* The current array entry to write an address into. */
UBYTE arrayIndex;
/* The manufacturer id for a located PLC-5/40V */
UWORD manId = 0;
/* The PLC-5/40V device type for a located PLC-5/40V */
UWORD devType = 0;
/* Let’s initialize the array to have no located PLC-5/40V’s. */
memset((char *) plcList, 0x0, sizeof(LOCATED_PLC540V_ARRAY_TYPE));