5. PROFIBUS-DP Protocol
ALSPA PROFIBUS Field Bus Coupler
Page 5-2
Technical Manual
(09/06)
The fields are defined as 16 bit words. Two octets form one word.
PKW PZD
PKE
IND PWE PWE PZD1
STW
ZSW
PZD2
HSW
HIW
PZD3
PZD4 PZD5 PZD6
PPO Type 1: Length 12 octets.
PPO Type 2: Length 20 octets.
PPO Type 3: Length 4 octets.
PPO Type 4: Length 12 octets.
PPO Type 5: Length 28 octets.
PPO Type 5 continued ….
PZD7
PZD8 PZD9 PZD10
Figure 5-1 - Parameter process data objects
The abbreviations derive from the PROFIBUS definition of each and
are kept the same to correspond to the PROFIDRIVE terminology:
PKW
= Parameter ID/value
PKE
= Parameter ID
IND =
Sub-index
PWE
= Parameter value
PZD
= Process Data, cyclically transferred
STW
= Control word
HSW
= Main set point
ZSW
= Status word
HIW
= Main actual value
The MVS3007-4002 PROFIBUS card can be configured to any of
PPO types 1 to 5 to provide 2, 6 or 10 reference and monitor words
respectively.
It is recommended that PPO types 1 and 2 are not used as their use
will only consume PROFIBUS communication bandwidth
3
If at any time the PPO type is changed then it is necessary to power cycle the drive
for the change to take effect.