Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual User Manual
Page 187
Message Formats
Appendix A
AĆ25
Diagnostic Counters Reset
Use this command to reset to zero all the diagnostic timers and counters in
the station interface module. The diagnostic status command gives the
starting address for this block of counters and timers.
Command Format:
FNC
DLE
SRC
STX
DST
C
06
S
TNS
MD
TS
TNS
DLE ETX
BCC
07
DATA
Reply Format:
DLE
SRC
STX
DST
C
46
S
TNS
MD
TS
TNS DLE ETX
BCC
Diagnostic Loop
You can use this command to check the integrity of transmissions over the
communication link. The command message transmits up to 243 bytes of
data to a station interface module. The receiving module should reply to
this command by transmitting the same data back to the originating
station.
Command Format:
DLE
C
S
TNS
MD TS
TNS
STX
DLE ETX
BCC
DATA - Max of 243 bytes
DST SRC
06
FNC
00
Reply Format:
DLE
C
S
TNS
MD TS
TNS
STX
DLE ETX
BCC
DATA - Max of 244 bytes
DST SRC
46