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Parameter handling in cyclic communication (DP)
In cyclic PROFIBUS DP communication, parameter data is
transferred in PPO message types 1, 2 and 5 (see
Parameter Identification part consists of eight bytes (see below).
The Request Label is used by the master when transmitting data
to the slave, while the Response Label is used by the slave as a
positive or negative acknowledgement. The tables below show the
Request/Response functions.
Request labels (from Master to Slave)
Request Function
0
No task
1
Request parameter value
2
Change parameter value (word)
3
Change parameter value (double word)
4
Request description element (not supported) 3
5
Change description element (not supported) 3
6
Request parameter value (array)
7
Change parameter value (array word)
8
Change parameter value (array double word) 5
9
Request number of array elements
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Parameter
Identification
ID
IND
VALUE
15 14 13 12 11 10
Request Label
Response Label
*Request Signal
*Not used (=0)
Process Data
CW REF
(PD1, PD2...)
SW ACT
9
8
7
6
5
Parameter Number (PNU)
Ackn. (+) Ackn. (-)
0
1, 2
1
2
4, 5
4
6
DP-V0 communication
51
Figure
6.). The
4
3
2
1
0
Response labels
–
7
7, 8
7, 8
7
7, 8
7, 8
7, 8
7,8
7
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