Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Instrukcja Użytkownika Pobierz pdf (Strona 159)

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Appendix B

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B-28

Requests the PLC-5 programmable controller to perform a block-transfer

read from an intelligent I/O module.

Important: You can use this function only if the coprocessor is connected

directly to the PLC-5 programmable controller.

C Syntax

# include <copro.h>

unsigned CC_PLC_BTR (r,g,m,size,retry,data_ptr,iostat)

unsigned char r;

unsigned char g;

unsigned char m;

unsigned char size;

unsigned char retry;

unsigned short *data_ptr;

unsigned *iostat;

Parameters

The assigned rack number in which the target I/O module resides.

The I/O group number that specifies the target I/O module.

The module slot number within the I/O group.

size

The number of words to be read from the I/O module.

retry

The retry value for doing the block transfer. If the value is, 0 the

processor will retry the transfer one time before returning. If the value

is 1, the processor will repeatedly attempt the transfer from an

unresponsive module for four seconds.

data_ptr

The address of a data buffer that will store the block transfer read data.

iostat

CC_PLC_BTR

1 2 ... 154 155 156 157 158 159 160 161 162 163 164 ... 311 312

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Instrukcja Użytkownika Strona 159