Rockwell Automation 6001-F2E AB STANDARD DRIVER SFTW - Manual (Page 46)

Specifying Message Packet Commands
with Send_StdDrv()
Appendix B
B-9
This command reads words of data from any area of PLC data table
memory. Use the SIZE field to specify the number of bytes to be read.
To specify a number of PLC words, SIZE should be an even value
because PLC words are two bytes long. Data bytes are transferred low
byte first. The address of a word should be even.
Command Format
CMD STS TNS
01
ADDR SIZE
Reply Format
CMD STS TNS
41
DATA
244 bytes max.
This command writes words of data into any area of PLC data table
memory.
Command Format
CMD STS TNS
08
ADDR DATA
244 bytes max.
Reply Format
CMD STS TNS
48
Important: If you are communicating to an SLC-500 using the
unprotected read or unprotected write commands, create a Data File 9 in
the SLC-500. The SLC-500 uses this file for DH-485 communication.
The data table address (defined as dt_addr in the Appl_StdDrv() function)
will be defined as a logical offset (in words) into Data File 9. See the
SLC-500 Advanced Programming Software Manual, chapter A3, for more
information on the SLC-500 memory organization.
Unprotected Read
Unprotected Write