Parameters In Cyclic Communication (Dp) - ABB NPBA-12 Installation And Startup Manual

Chapter 6 – Communication
Parameters in Cyclic
Communication (DP)
6-10
In cyclic PROFIBUS-DP communication, parameter data is transferred
in PPO message types 1, 2 and 5 (see
Identification part consists of eight bytes (see below).
Parameter
Identification
ID IND VALUE
15 14 13 12 11 10
Request Label
Response Label
*Request Signal
*
Not used (=0)
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
*5 Change description element
*6 Request parameter value (array)
*7 Change parameter value (array word)
*8 Change parameter value (array double word)
*9 Request number of array elements
*Not supported by NPBA-12 SW version V1.0
Figure
Process Data
CW REF
(PD1, PD2...)
SW ACT
9 8 7 6 5
Parameter Number
NPBA-12 Installation and Start-up Guide
6-1). The Parameter
4 3 2 1 0
Response Labels
Ackn. (+) Ackn. (-)
0 –
1, 2 7
1 7, 8
2 7, 8
3 7
3 7, 8
4, 5 7, 8
4 7, 8
5 7,8
6 7