Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual do Utilizador descarregar pdf (Página 225)

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Appendix B

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B-94

Handles a PLC-5 programmable-controller generated message-

read instruction.

C Syntax

#include <copro.h>

unsigned MSG_READ_W_HANDLER (variable,buff_size,msg_num,

items,timeout,cc_type,plc_type,

iostat)

short *variable;

unsigned buf_size;

unsigned msg_num;

unsigned items;

unsigned timeout;

unsigned cc_type;

unsigned plc_type;

int *iostat;

Parameters

variable

Address of a buffer that has the data to be read.

buff_size

Size of the read buffer in bytes.

msg_num

Number of the PLC-5 programmable controller message (0-31).

items

Number of data items to be read by the PLC-5 programmable controller.

The number and size of items cannot be greater than 240 bytes—e.g.,

maximum of 60 floating-point values of 4 bytes each = 240 bytes.

timeout

Timeout value in seconds. A value of CC_FOREVER (defined in

COPRO.H) will not return until the message has been processed.

MSG_READ_W_HANDLER

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual do Utilizador Página 225