Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 133)

8–6 Message Packet Status Codes (STS, EXT STS)
Publication 1770Ć6.5.16 - October 1996
Remote STS and EXT STS Codes from a PLCĆ3 Processor
A PLC-3 interface module (1775-KA,-S5,-SR5) inserts the reply
error code in the STS byte of any reply message packet it returns to a
remote node (your computer).
The meaning of each error code depends on the command message
received from the computer. The following pages describe the error
conditions that the various commands can generate. The error codes
are listed according to the decimal value that is stored at the
computer.
When a remote node transmits one of these commands, the local
PLC-3 interface module may issue a reply message that contains one
of the error codes listed under that command. Error codes contained
in the EXT STS bytes are only available if either another PLC-3 or
computer originates the command message.
Command EXT STS Code STS Code Explanation
diagnostic read - 10 • A twoĆbyte ADDR field and a oneĆbyte SIZE field
are missing after the FNC byte in the command
message.
• The number of bytes of data requested in the SIZE
field is greater than the maximum number allowed
per reply packet (244), or SIZE is 0.
- 50 The command is an illegal request to read from the
PLCĆ3 interface module's backplane window.
diagnostic status - 40 A backplane error occurred during determination of
the physical address of the end of the ladder
diagram program or of the end of user memory.
PLC/PLCĆ2 word write - 10 • A twoĆbyte ADDR field is expected after the TNS
word, but only one byte is present.
• There is an odd number of data bytes in the
command packet.
• The ADDR value is odd (that is, it does not specify
a word address).
- 30 The local PLCĆ3 interface module has executed a
shutdown request to the local PLCĆ3 processor.
- 40 Local PLCĆ3 backplane error (either memory parity,
timeout, or disconnect).
- 50 • The destination file does not exist in PLCĆ3
memory.
• The destination word does not exist in the
destination PLCĆ3 file.
• The length of the destination file is greater than
65,535 words.
- 60 Local keyswitch setting prohibits writing into desired
destination file.
- 70 The local PLCĆ3 processor is in Program mode.
There may be a major system fault.