Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Uživatelský manuál stáhnout pdf (Strana 178)

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Appendix B

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B-47

Gets a floating-point value from a byte array.

C Syntax

#include <copro.h>

unsigned DTL_GET_FLT (in_buf,out_val)

unsigned char *in_buf;

float *out_val;

Parameters

in_buf

Use to specify an array of four bytes containing an IEEE floating-point

value read from the data table as raw data.

out_val

Contains the floating point value. It is assumed that the bytes are read

into the a data area using the RAW data_type.

Returns

Status Symbolic Name Meaning

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Description

Use the DTL_GET_FLT to converts raw 32-bit IEEE float data, in 4-byte

array, to host-type float.

C Example

float read_val;

unsigned char untyped_data[60];

unsigned machine, iostat;

DTL_C_DEFINE (&machine, “F8:10,15,RAW,READ”);

if (DTL_READ_W (machine, untyped_data, &iostat) == 0)

{

DTL_GET_FLT (&untyped_data [3], &real_val);

}

DTL_GET_FLT

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Uživatelský manuál Strana 178