Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 128)

Message Packet Formats
Chapter 5
5-49
have the privilege of placing the host in a Download mode. This error
occurs when:
the processor is in Program or Run mode (must be in Remote Program
or Remote Run mode),
the processor is being edited, or
some other station is already downloading to the processor.
The format for this message is as follows:
Command Format:
Reply Format:
TNS STS CMD
0F
SRC DST
TNS STS CMD
4F
SRC DST
FNC
3A
EXT
STS
1
1 Flag Byte (Explained Below)
The STS and EXT STS bytes contain status and error code information.
For more information on these bytes, see the “Error Codes” section in this
document.
You use the bits in the flag byte of the set processor command as follows:
Bits 2 through 7 are unused.
Bits 0 and 1 determine which operating mode is selected.
This table shows the settings of Bits 0 and 1 for each operating mode:
For This Operating Mode: Bit 1 Bit 0
Program/Load Mode (Processor Idle, I/O Disabled) 0 0
Remote Test Mode (Processor Scanning, I/O Disabled) 0 1
Remote Run Mode (Processor Scanning, I/O Enabled) 1 0
No Change (Only Remote Bit Affected) 1 1