Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 155)

Network and Application Layer Protocols
Chapter 12
12Ć8
Table 12.A
The commands that the PLC-3 can send and/or receive, and the hexadecimal values for the
CMD and FNC bytes
Devices that
can send the
command
Command
Type
Command Name
Command
Message
(Hex)
CMD+ FNC+
Reply
Message
(Hex)
CMD+
PLC-3 or
RS-232-C [1]
device
Basic" [2] Protected Bit Write
Protected Block Write
Unprotected Bit Write
Unprotected Block Read
Unprotected Block Write
02
00
05
01
08
none
none
none
none
none
42
40
45
41
48
PLC-3 or
RS-232-C
device
PLC-3
commands
Bit Writes
File Read
File Write
Word Range Read
Word Range Write
0F
0F
0F
0F
0F
02
04
03
01
00
4F
4F
4F
4F
4F
RS-232-C
device
PLC-3
Upload/
Download
Commands
Download Request
Restart Request
Shutdown Request
Upload Request
0F
0F
0F
0F
05
0A
07
06
4F
4F
4F
4F
RS-232-C
device
Privileged [3] Physical Read
Physical Write
0F
0F
09
08
4F
4F
RS-232-C
device
Diagnostic Counter Reset
Loop
Read
Status
Set ENQs
Set NAKs
Set Timeout
Set Variables
06
06
06
06
06
06
06
06
07
00
01
03
06
05
04
02
46
46
46
46
46
46
46
46
[1] RS-232-C device means a computer or intelligent terminal.
[2] The Basis" commands can be sent to any Allen-Bradley PC. These commands are sometimes called PLC/PLC-2 commands, but all
Allen-Bradley PC's can receive them. The PLC, PLC-2 family, and PLC-3 processors can also send these commands as well as receive them.
[3] Allen-Bradley recommends using these commands for uploading or downloading only. To write or read specific words or bits use the basic"
commands or the PLC-3 commands.
STS (status)
The high nibble of the STS (status) byte is supplied by the application
layer. In command messages the STS byte is set to zero.
In reply messages the STS is used for reporting either application or
network error codes. A value of zero should be interpreted as no error
(that is, the message was delivered and executed successfully). Non–zero
status can be divided into two categories: remote errors and local errors.