Danfoss VLT FC 360 Design Manual

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Danfoss VLT FC 360 Design Manual Manual pdf 46 page image

3.4.6 The Data FieldThe structure of data blocks depends on the type of telegram. There are three telegram types, and the type applies for bothcontrol telegrams (master⇒slave) and response telegrams (slave⇒master).The 3 types of telegram are:Process block (PCD)The PCD is made up of a data block of 4 bytes (2 words) and contains:- Control word and reference value (from master to slave)- Status word and present output frequency (from slave to master)ADRLGESTX PCD1 PCD2 BCC130BA269.10Illustration 3.4 Process BlockParameter blockThe parameter block is used to transfer parameters between master and slave. The data block is made up of 12 bytes (6words) and also contains the process block.PKE INDADRLGESTX PCD1 PCD2 BCC130BA271.10PWEhigh PWElowIllustration 3.5 Parameter BlockText blockThe text block is used to read or write texts via the data block.PKE IND130BA270.10ADRLGESTX PCD1 PCD2 BCCCh1 Ch2 ChnIllustration 3.6 Text Block3.4.7 The PKE FieldThe PKE field contains two subfields: Parameter commandand response (AK) and Parameter number (PNU):15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0130BB918.10PKE IND PWE high PWElowAK PNUParametercommandsand repliesParameternumberIllustration 3.7 PKE FieldRS-485 Installation and Set... VLT® AutomationDrive FC 360 Design Guide44 MG06B202 - VLT® is a registered Danfoss trademark33