Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario descargar pdf (Pagina 236)

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Appendix B

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B-105

Handles a PLC-5 programmable-controller message-write instruction.

C Syntax

#include <copro.h>

unsigned MSG_WRITE_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 stores the write data.

buff_size

Size of the write buffer in bytes.

msg_num

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

items

Number of data items to be written by the PLC-5 programmable

controller. The number and size of the items cannot be greater than

234 bytes—e.g., maximum of 58 floating-point values of 4 bytes each

are < 234 bytes.

timeout

Timeout value in seconds. When using a value of CC_FOREVER

(defined in COPRO.H), this function keeps the write handler posted

until a message has been received.

MSG_WRITE_HANDLER

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario Pagina 236