Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual do Utilizador descarregar pdf (Página 140)

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Appendix B

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B-9

Returns

Status Symbolic Name Meaning

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Description

Use the BPI_WRITE routine to allow the programmable controller

to perform a block-transfer read over the I/O backplane to the

control coprocessor.

It may accomplish a block-transfer read with the control coprocessor by

allowing both a timeout and a trigger mask to be specified. The function

will first do a single transfer with the programmable controller using the

caller’s trigger mask. The programmable-controller ladder program can

monitor the input image for the control coprocessor to receive the trigger

mask. If one of the user-specified bits goes true, then a block-transfer read

to the control coprocessor is initiated. The function will then return to the

caller when either the block transfer or the timeout has occurred. This

function will return a success or fail status. In the case of a fail status, the

caller can check the returned status value to find out why the function

failed—i.e., transfer_size > 64.

C Example

unsigned char size=6; /* size of block transfer */

short outbuff[32]; /* location of copy data from */

unsigned int timeout=2; /* user timeout in two seconds */

unsigned short trg_mask = 0x400; /*trigger mask, bit 12 (octal) is set */

int status; /*status value of BPI_WRITE*/

status = BPI_WRITE (size, outbuff, timeout, trg_mask);

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual do Utilizador Página 140