Emerson SI-PROFIBUS

Unidrive M SI-PROFIBUS User Guide 85
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
Table 14.10 CT Single Word Bit Positions
Table 14.11 CT Single Word Bit Definitions
14.6 Reading parameters using CT Single Word
To read 32-bit parameters using the non-cyclic channel, the following “telegrams” must
be transmitted to construct the final message:
• Telegram 1 - define menu number
• Telegram 2 - define parameter number
• Telegram 3 - request high data byte
• Telegram 4 - request mid-high data byte
• Telegram 5 - request mid-low data byte
• Telegram 6 - request low data byte
b15 b14 b13 b12 b11 b10 b9 b8
READ ERR Reserved 32-BIT Stamp Number
b7 b6 b5 b4 b3 b2 b1 b0
Data Byte
Bit Function Values Description
0 to 7 Data 0 to 255
Depending on the stamp number of the telegram, this
byte contains the menu, parameter or data byte.
8 to 11
Stamp
number
0 to 6
Indicates the stamp number of the word. This shows
which part of the message is currently in progress.
Setting the stamp number to 0 resets the internal
non-cyclic state machine.
12 32-BIT
0 = 16-bit
data
1 = 32-bit
data
Specifies whether a 16-bit or 32-bit data value is to be
written to or read from the drive. If 32-BIT is set,
telegrams 5 and 6 will be used to transfer the
additional data bytes.
13 Reserved 0 Reserved for future use. Always set to 0.
14 ERR
0 = Data
OK
1 = Error
Indicates the success or failure of the message.
Failure could occur if the parameter does not exist, or
is a read-only or write-only parameter. This bit will
also be set if the parameter value is out of range in
16-bit mode.
15 READ
0 = Write
1 = Read
Defines whether the data word is part of a READ or
WRITE cycle.
Setting the stamp number to 0 resets the internal non-cyclic state machine. Allowing a
new message to be started.
CT Single Word non-cyclic data uses only one word of data, when using this with data
alignment set to 32 requires two 16-bit words. In this mode only the least significant word
of the 32-bit word is used.
NOTE
NOTE