FCM 300 / FCD 300 / VLT
®
2800 / DP V1 PROFIBUS
Profibus DP
■
DP communication relations
Communication according to PROFIBUS DP, i.e. EN
50170 part 3, is supported. Consequently a master
that supports PROFIBUS DP must be used.
By DP communication one of the parameter-process
data objects (PPO
’
s) described below must be used.
■
PPO description
A special feature of the PROFIBUS Profile for frequency
converters is the communication object called a PPO,
meaning
Parameter-Process Data Object
.
The PPO is well suited for fast cyclical data
transfer, and may, as the name implies, carry both
process data and parameters.
The selection of PPO type is made according
to the master configuration.
A PPO may consist of a parameter part and process
data part. The parameter part can be used for reading
and/or updating the parameters one by one. The
process data part consists of a fixed part (4 bytes)
and a parametrable part (8 or 16 bytes). In the fixed
part control word and speed reference are transfered
to the frequency converter while status word and
actual output frequency feedback are transfered
from the frequency converter. In the parametrable
part the user chooses which parameters have to
be transfered to (parameter 915) and which from
(parameter 916) the frequency converter.
PPO. Parameter-Process Data Object
By DP one of the following shown PPO
’
s must be used:
PCD:
Process Data
PCV:
Parameter-Characteristics-Value
PCA:
Parameter-Characteristics (Bytes 1, 2)
(PCA handling see section
PCA handling
)
IND:
Subindex (Byte 3), (Byte 4 is not used)
PVA:
Parameter value (Bytes 5 to 8)
CTW:
Control word see section
Control word
STW:
Status word see section
Status word
MRV:
Main reference value
MAV:
Main actual value (Actual output frequency)
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