Danfoss FCM 300 Operating Instructions Manual

Also see for VLT 2800: Manual Instruction manual Quick guide Design guide Installation instructions

Contents

Danfoss FCM 300 Operating Instructions Manual Manual pdf 21 page image

FCM 300 / FCD 300 / VLT ® 2800 / DP V1 PROFIBUSProfibus DP■ DP communication relationsCommunication according to PROFIBUS DP, i.e. EN50170 part 3, is supported. Consequently a masterthat supports PROFIBUS DP must be used.By DP communication one of the parameter-processdata objects (PPO’s) described below must be used.■ PPO descriptionA special feature of the PROFIBUS Profile for frequencyconverters is the communication object called a PPO,meaning Parameter-Process Data Object.The PPO is well suited for fast cyclical datatransfer, and may, as the name implies, carry bothprocess data and parameters.The selection of PPO type is made accordingto the master configuration.A PPO may consist of a parameter part and processdata part. The parameter part can be used for readingand/or updating the parameters one by one. Theprocess data part consists of a fixed part (4 bytes)and a parametrable part (8 or 16 bytes). In the fixedpart control word and speed reference are transferedto the frequency converter while status word andactual output frequency feedback are transferedfrom the frequency converter. In the parametrablepart the user chooses which parameters have tobe transfered to (parameter 915) and which from(parameter 916) the frequency converter.PPO. Parameter-Process Data ObjectBy DP one of the following shown PPO’s must be used:PCD: Process DataPCV: Parameter-Characteristics-ValuePCA: 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 wordSTW: Status word see section Status wordMRV: Main reference valueMAV: Main actual value (Actual output frequency)MG.90.A5.02 - VLT is a registered Danfoss trademark20