Delta 36-R31 User Manual download pdf (Page 38)

ACC-36E Manual

USing acc-36E with power umac 38

Example: Unipolar/Bipolar ADC Read in a CPLC

Configuring two ACC-36E cards: 1

card has unipolar inputs and is at base offset $A00000, and 2

card

has bipolar inputs at base offset $B00000.

#include <gplib.h>

#include <stdio.h>

#include <dlfcn.h>

// Definition(s)

#define FirstCardNumber 0 // At Base Offset $A00000

#define SecondCardNumber 1 // At Base Offset $B00000

// Prototype(s)

int WaitForADC(unsigned int Card_Index);

void user_plcc() {

unsigned int ADC_Result_Unipolar[16],index;

int ADC_Result_Bipolar[16],waitResult = 0;

char buffer[32]="";

double temp = 0,ConvertCode = 0;

// Access ADC results one by one in a for loop

for(index = 0; index < 8; index++) {

// Prepare string

sprintf(buffer,"ACC36E[%d].ConvertCode",FirstCardNumber);

ConvertCode = index; // Compute convert code

// Write Unipolar convert code to Channel Select structure

SetPmacVar(buffer,ConvertCode);

// Poll conversion complete bits until the conversions are finished

waitResult = WaitForADC(FirstCardNumber);

if(waitResult < 0)

{

return; // Conversion was not successful

}

// Prepare string

sprintf(buffer,"ACC36E[%d].ADCuLow",FirstCardNumber);

GetPmacVar(buffer,&temp); // Read the structure

// Cast and store low unipolar (unsigned) ADC Result in array element

ADC_Result_Unipolar[index] = (unsigned int)temp;

// Prepare string

sprintf(buffer,"ACC36E[%d].ADCuHigh",FirstCardNumber);

GetPmacVar(buffer,&temp); // Read the structure

// Cast and store high unipolar (unsigned) ADC Result in array element

ADC_Result_Unipolar[index + 8] = (unsigned int)temp;

// Prepare string

sprintf(buffer,"ACC36E[%d].ConvertCode",SecondCardNumber);

ConvertCode = index + 8; // Compute convert code

// Write bipolar convert code to Channel Select structure

SetPmacVar(buffer,ConvertCode);

// Poll conversion complete bits until the conversions are finished

waitResult = WaitForADC(SecondCardNumber);

if(waitResult < 0)

{

return; // Conversion was not successful

}

// Prepare string

sprintf(buffer,"ACC36E[%d].ADCsLow",SecondCardNumber);

GetPmacVar(buffer,&temp); // Read the structure

// Cast and store low bipolar (signed) ADC Result in array element

ADC_Result_Bipolar[index] = (int)temp;

// Prepare string

sprintf(buffer,"ACC36E[%d].ADCsHigh",SecondCardNumber);

GetPmacVar(buffer,&temp); // Read the structure

// Cast and store high bipolar (signed) ADC Result in array element

ADC_Result_Bipolar[index + 8] = (int)temp;

/******Insert user code here, where ADC_Result_Unipolar elements

and ADC_Result_Bipolar elements

can be used for the user's calculations*************/

}

return;

}

int WaitForADC(unsigned int Card_Index)

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