Leroy-Somer digitax st User Manual page 43

8.8.2 PPO 4 Word protocol
Table 8.8 shows the data structure required on the OUT data to implement PPO 4 Word
request.
Decimal point information is inserted automatically when the data value is written to the
NOTE
drive and removed when the data value is read. Hence the number of decimal places of
the target parameter must be known. Writing a value of 1234 to a parameter with two
decimal places will produce a value of 12.34 in the target parameter. Similarly reading a
value of 12.34 will return a 32-bit integer value of 1234.
Table 8.8 PPO 4 Word OUT data structure
OUT data
word
OUT word 0
OUT word 1
OUT word 2
OUT word 3
The PPO 4 Word protocol is controlled by the TASK ID and RESPONSE ID; the TASK
ID specifies the transaction required and the remainder of the data words carry the data
for the transaction. Table 8.9 lists the possible TASK ID codes.
Table 8.9 TASK ID codes
TASK ID
0
1
2
3
4
5
6
7
8
9
SM-PROFIBUS DP-V1 User Guide
Issue : a
b15-b12 b11
TASK ID 0
PARAMETER
Function
No task
Fieldbus specific
Fieldbus specific
Fieldbus specific
Not implemented
Not implemented
Request parameter
value
Change parameter
value (16-bit)
Change parameter
value (32-bit)
Request last parameter
reference
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Function
b10-b8
MENU
Reserved
DATA HIGH word
DATA LOW word
Description
No non-cyclic transaction required
Reserved
Reserved
Read parameter value from drive.
Specify MENU and PARAMETER, set DATA HIGH word
and DATA LOW word to 0.
Write 16-bit parameter value to the drive.
Specify MENU, PARAMETER and DATA LOW word. (Any
value in DATA HIGH word will be discarded.) This function
can be used to write to 32-bit drive parameters, but the
range of values is limited to 16-bits.
Write 32-bit parameter value to the drive.
Specify MENU, PARAMETER, DATA HIGH word and
DATA LOW word. This function can also be used to write
to 16-bit drive parameters, but if DATA HIGH word is not
set to 0, a value over-range error will be reported.
Returns the last parameter for the specified menu.
Specify MENU. (Values in PARAMETER, DATA HIGH
word and DATA LOW word will be discarded.)
b7-b0
43