Rockwell Automation 1771-DB BASIC MODULE - Manual (Page 241)

Chapter
Call Routines 0–68 12
12 -51
3. The BASIC module sets bit 15 in the input image table to inform the
PLC processor that a block transfer write will be performed.
PLC Processor
BASIC Module
PLC Backplane
Set Input
Image Table
Bit 15
4. The BASIC module performs a block transfer to receive the data.
BASIC Module
PLC Processor
PLC Backplane
DATA 2–64
BTW Buffer
Reserved Reserved
5. The PLC processor unlatches bit 15 in the output image table.
PLC Processor
BASIC Module
PLC Backplane
Unlatch Output
Image Table
Bit 15
6. The BASIC module resets bit 15 in the input image table.
PLC Processor
BASIC Module
PLC Backplane
Reset Input
Image Table
Bit 15