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 D ata 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 pa rt. 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 feedbac k are transfered
from the frequency converter. In the parametrable
part the user chooses which parameters have to
be transfered to (parameter 915) and w hich from
(parameter 916) the frequency converter.
PPO. Parameter-Process Data Object
By DP one of the following shown PPO’smustbeused:
PCD: Process Da
ta
PCV: Parameter-
Characteristics-Value
PCA: Parameter-C
haracteristics (Bytes 1, 2)
(PCA handling s ee 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)
MG.90.A5.02 - VLT is a registered Danfoss trademark
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