Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 85)

6–6 Application Layer Message Packets
Publication 1770Ć6.5.16 - October 1996
STS and EXT STS
These bytes work together to indicate the status of the message
transmission.
This byte In this message Has this value
STS
command The application program sets = 0.
STS
(status) reply
= 0 when the command has executed with no
error.
EXT STS ➀
(extended status)
reply
= one of the status codes listed in Chapter 8,
Message Packet Status Codes (STS, EXT
STS)." This byte will also 0 if an error
occurs.
➀ EXT STS is part of the message only if STS = F0.
3 2 1 0 7 6 5 4
Link layer uses these bits to report local errors Ċ errors that occur
when the link layer attempts to transmit a message across the link.
Application layer uses these bits (and in some cases the EXT STS byte),
to report remote errors Ċ errors that occur when the command executor
at the destination node tries to execute the command message).
STS byte
EXT STS byte
no EXT STS byte
No
Four high bits
of STS byte all
= 1 (F0 hex)?
Yes
STS and EXT STS error codes
For more information on STS and EXT STS error codes,
see Chapter 8, “Message Packet Status Codes (STS, EXT STS).”
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