Emerson SI-PROFIBUS

Unidrive M SI-PROFIBUS User Guide 91
Issue Number: 3
Safety
information
Introduction
Mechanical
installation
Electrical
installation
Getting
started
Parameters
GSD
Files
Cyclic data
Non-cyclic
data
Control and
status words
Diagnostics
PROFIdrive
profile (V4)
Advanced
features
Legacy
features
Glossary of
terms
Index
TELEGRAM 1
The first telegram from the PROFIBUS-DP master indicates a WRITE cycle by setting
the R/W bit to 0. The stamp number is set to 1. The data byte contains the menu
number for the parameter that is to be written to.
Example telegram
Data word = 0x1101
Stamp number = 1
Menu = 1
When the first telegram has been received and processed in the slave node, it is
mirrored in the non-cyclic IN word. This is the signal to the master controller program
that the first telegram of the message has been received and understood and the
second telegram can be transmitted.
TELEGRAM 2
The second telegram from the PROFIBUS-DP master also indicates a write cycle, but
the stamp number is now set to 2. The data byte would contain the parameter number
for the parameter that is to be written to
Example telegram
Data word = 0x1215
Stamp number = 2
Parameter = 21
When the second telegram has been received and processed in the slave node, it is
mirrored in the non-cyclic IN word. This is the signal to the master controller program
that the second telegram of the message has been received and understood and the
third telegram can be transmitted.
TELEGRAM 3
The third telegram from the PROFIBUS-DP master has the stamp number set to 3. The
data bits contain the high data byte for the parameter being written to.
Example telegram
Data word = 0x1300
Stamp number = 3
Data high byte = 0x00
When the third telegram has been received and processed in the slave node, it is
mirrored in the non-cyclic IN word. This is the signal to the master controller program
that the third telegram of the message has been received and understood and the fourth
telegram can be transmitted.
Bit b15-b12 b11-b8 b7-b4 b3-b0
Value 0001 0001 0000 0001
Bit b15-b12 b11-b8 b7-b4 b3-b0
Value 0001 0010 0001 0101
Bit b15-b12 b11-b8 b7-b4 b3-b0
Value 0001 0011 0000 0000