Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 75)

100

101

Chapter

5 -1

Programming Block-Transfers

This chapter describes: On page:

BASIC module memory organization

5 -1

data tables 5 -2

block-transfer buffers 5 -4

block-transfers and the BASIC module 5 -5

PLC-2 family processors ladder logic 5 -8

PLC-3 family processors ladder logic 5 -9

PLC-5 family processors ladder logic 5 -10

PLC-5/250 family processors ladder logic 5 -12

what’s next? 5 -12

All data transferred from the PLC to the BASIC module must be routed

through the BASIC module input buffer. The block transfer write buffer

(BTW) is part of the input buffer. This table lists the defined offsets of the

BASIC module input buffer. These offset numbers are used by the various

calls that manipulate the BTW buffer or the DH-485 common interface

file.

Offset Definition

reserved

1–64 PLC block transfer write from PLC processor

65–99 reserved

100–139 data transferred from the DH-485 common interface file

All data transferred from the BASIC module to the PLC must be routed

through the BASIC module output buffer. The block transfer read buffer

(BTR) is part of the output buffer. This table lists the defined offsets of the

BASIC module output buffer. These offsets are used by the various calls

that manipulate the BTR buffer or the DH-485 common interface file.

Offset Definition

reserved

1–64 block transfer read to PLC processor

65–99 reserved

100–139 data transferred to the DH-485 common interface file

What’s in This Chapter?

BASIC Module Memory

Organization

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 393 394

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