Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 188)

Message Formats
Appendix A
AĆ26
Diagnostic Read
You use this command to read up to 244 bytes of data from the PROM or
RAM of the station interface module. You can use it to read the module’s
diagnostic timers and counters. Use the diagnostic status command to
obtain the starting address of the diagnostic counters.
Command Format:
FNC DLE SRC STX DST C
06
S TNS
MD TS TNS DLE ETX BCC
01
SIZE ADDR
Reply Format:
DLE C S TNS MD TS TNS STX DLE ETX BCC
DATA - Max of 244 bytes DST SRC
46
Diagnostic Status
You use this command to read a block of status information from the
station interface module. The reply to this command contains the status
information in its DATA field.
Command Format:
FNC DLE SRC STX DST C
06
S
TNS
MD TS TNS DLE ETX BCC
03
Reply Format:
DLE C S TNS MD TS TNS STX DLE ETX BCC
DATA - Max of 244 bytes DST SRC
46
The status information varies with the type of station interface module.
Table A.B describes this status DATA for 1775–KA modules.