Rockwell Automation 6001-F2E AB STANDARD DRIVER SFTW - Manual (Page 48)

Specifying Message Packet Commands
with Send_StdDrv()
Appendix B
B-11
Reply Format
CMD STS TNS EXT STS DATA
(244 bytes max) (only if error) 4F
The following are possible STS and EXT STS responses.
Table B.E
Possible Responses for Typed Logical Read with Three Address Fields
This Response Means
STS
00 success
10 command format incorrect
50 address problem
F0 extended STS
EXT STS
1A file already open