Chapter 6 – Communication
6-10 NPBA-12 Installation and Start-up Guide
Parameters in Cyclic
Communication (DP)
In cyclic PROFIBUS-DP communication, parameter data is transferred
in PPO message types 1, 2 and 5 (see Figure 6-1). The 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
Response Labels
Ackn. (+) Ackn. (-)
0No task 0 –
1 Request parameter value 1, 2 7
2 Change parameter value (word) 1 7, 8
3 Change parameter value (double word) 2 7, 8
*4 Request description element 3 7
*5 Change description element 3 7, 8
*6 Request parameter value (array) 4, 5 7, 8
*7 Change parameter value (array word) 4 7, 8
*8 Change parameter value (array double word) 5 7,8
*9 Request number of array elements 6 7
*Not supported by NPBA-12 SW version V1.0
ID IND VALUE
15 14131211109876543210
Request Label
Response Label
*Request Signal
Parameter Number
Process Data
Parameter
Identification
*Not used (=0)
CW REF
(PD1, PD2...)
SW ACT
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