Rockwell Automation 1794-APB/B FLEX I/O PROFIBUS Adapter Module User Manual - Manual (Page 94)

4–2 Configure the Adapter for Master/Slave Communication
Publication 1794ĆUM057B-EN-P - November 2001
Send parameter data is comprised of a string of octets (1–32) that
contain 244 bytes of data:
•
octets 1–7 contain data specific to the:
– PROFIBUS standard
– defaults contained in the database (GSD) file
•
octets 8–32 are user configurable and contain user parameter
data. User parameter data consists of these formats:
– auto configure
– condensed
– full
The following illustration shows the structure of the send parameter
data table.
Group
Ident.
Ident.
Number
Minimum
Station
Delay
Watchdog
Control
Station
Status
User Parameter Data
Watchdog
Control
Octet 1 Octet 2 Octet 3 Octet 4 Octets 5&6 Octet 7 Octets 8-32
You configure these values using your
software configuration tool.
These values are defined by the PROFIBUS
standard. The defaults are provided by
the GSD file.
User Parameter Data
The first byte of the user parameter data is the flags byte. This byte
selects the appropriate format and also specifies adapter behavior.
The flags byte is defined in the following table:
Send Parameter Data Flags Byte
Bit Position Name Description
0-1 Format Selection 00 = Auto Configure
01 = Reserved
10 = Condensed
11 = Full
2-3 Fault Action 00 = Reset to zero
01 = Hold Last State
10 = Use Safe State
11 = Reserved
4 Format Selection 0 = Reset inputs to
zero
1 = Hold Last Value
5-7 Reserved Reserved bits must
be zero
Entering User Parameter
Data