Rockwell-automation 1771-DB BASIC MODULE Uživatelský manuál stáhnout pdf (Strana 78)

100

101

Chapter

Programming Block-T

ransfers

5 -4

Block-Transfer Write Buffer

The BASIC module processor maintains a block-transfer-write (BTW)

buffer containing the values of the last BTW sent by the PLC processor.

Use CALL 4 to set the BTW word length. Transfer data to the BASIC

module’s BTW buffer with CALL 6 or CALL 3.

Block-Transfer Read Buffer

The BASIC module also maintains a block-transfer-read (BTR) buffer that

is the value of the next block, read by the PLC processor. Use CALL 5 to

set the BTR word length. Transfer the data to the BASIC module

processor BTR buffer (for subsequent transfer to the PLC processor) with

CALL 7 or CALL 2. You should complete the building of the read buffer

before initiating its transfer.

Important: Use CALL 4 and CALL 5 once, immediately after power-up if

possible. CALL 4 sets the BTW block length. CALL 5 sets the BTR

block length. Failure to follow these guidelines could cause random

lockup of the BASIC module program.

Block-Transfer Buffers

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 393 394

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