Basic Message Formats - Allen-Bradley 1779-KFMR User Manual

Basic Message Formats

Unless otherwise stated, values shown are in hexadecimal, and each block
shown represents one byte.
Reset Counters
Use this command to reset to zero all the diagnostic counters and timers in
an interface. Use the diagnostic status command to find the starting
address for a block of counters and timers. You can send this command to
any Data Highway II interface.
Command Format:
Success Reply Format:
Unless otherwise stated, values shown are in hexadecimal, and each block
shown represents one byte.
In "Application Fields," we described the Data Highway message fields
defined at the application layer. Here, we describe the format of each
specific type of basic command message and success-reply message at the
application layer. In each of these formats, we also show the Data
Highway fields to indicate where the application-layer fields fit in the
message packet. The basic command set includes commands that
generally can be executed by any programmable controller node on the
link, regardless of the type of controller. In some cases, switch settings on
the node interface can disable execution of a particular type of command
at that station. For more details, refer to the user's manual for the node
interface.
The basic commands are:
Protected Write Bit
Protected Write Block
Unprotected Read Block
Unprotected Write Bit
Unprotected Write Block
Chapter 8