Rockwell Automation 1771-DB BASIC MODULE - Manual (Page 75)

5 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
0 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
0 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