Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 108)

Message Packet Formats
Chapter 5
5-29
Set Data Table Size
This command sets the data table size for the PLC-2 processor. Use this
command immediately before performing any physical writes on the
PLC-2 processor.
For the DATA field in this command, enter the number of bytes of
memory that you want to allocate to the PLC-2 data table. Since PC
words are two bytes long, the DATA value is double the number of words
in the PLC-2 data table. The DATA value is also equivalent to the
physical address (Chapter 6) of the start of the processor’s program
memory. To determine allowable data table sizes, refer to the
programming manual for the appropriate PLC-2 processor.
Command Format:
Reply Format:
TNS STS CMD
07
SRC DST
TNS STS CMD
47
SRC DST
FNC
03
DATA
PLC-3 Commands
PLC-3 stations can execute all of the commands in the basic command
set. They can also execute the following commands, which apply
specifically to PLC-3 controllers:
Non-Privileged Commands
Bit Write
Word Range Read
Word Range Write
Privileged Commands
Download Request
Physical Read
Physical Write
Restart Request
Shutdown Request
Upload Request