SI-INTERBUS User Guide
47
Issue Number: 1
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Introd
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Table 8-7 Ten cyclic words with PPO 4 Word non-cyclic data mapping
8.2.2
PPO 4 Word protocol
The PPO 4 Word protocol uses the first four words (IN and OUT) of the non-cyclic
channel.
All parameter values are written as signed 32-bit data values. Decimal point information
is inserted automatically when the data value is written to the 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 2 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.
The PPO 4 Word protocol format is shown in
Table 8-8 PPO 4 Word OUT data structure
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.
The possible TASK ID codes are shown in
Mapping
Parameter
Before format change
(Pr 17.005 = 6)
After format change
(Pr 17.005 = 210)
Value
Mapping
Value
Mapping
Pr
17.010
1040
Pr
10.40
,
Status Word
6151
Pr
61.51
,
PPO 4 Word non-
cyclic mode 2
Pr
17.011
201
Pr
2.01
,
Post Ramp
Reference
1040
Pr
10.40
,
Status Word
Pr
17.012
0
User Defined
201
Pr
2.01
,
Post Ramp
Reference
Pr
17.013
0
Not available
0
User Defined
Pr
17.014
to
Pr
17.019
0
Not available
0
Not available
Pr
17.020
642
Pr
6.42
,
Control Word
6151
Pr
61.51
,
PPO 4 Word non-
cyclic mode 2
Pr
17.021
121
Pr
1.21
,
Preset Reference 1
642
Pr
6.42
,
Control Word
Pr
17.022
0
User Defined
121
Pr
1.21
,
Preset Reference 1
Pr
17.023
0
Not available
0
User Defined
Pr
17.024
to
Pr
17.029
0
Not available
0
Not available
Out Data Word
Function
b15 to b12
b11
b10 to b8
b7 to b0
OUT Word 0
TASK ID
0
MENU
OUT Word 1
PARAMETER
Reserved
OUT Word 2
DATA HIGH word
OUT Word 3
DATA LOW word
