Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual

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Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual Manual pdf 135 page image

A number of data bytes (variable, depending on the typeof telegram) follows.A data control byte (BCC) completes the telegram.STX LGE ADR DATA BCC195NA099.10Illustration 7.57.3.3 Telegram Length (LGE)The telegram length is the number of data bytes plus theaddress byte ADR and the data control byte BCC.Data Length4 data bytes LGE = 4 + 1 + 1 = 6 bytes12 data bytes LGE = 12 + 1 + 1 = 14 bytesTelegrams containing texts 101)+n bytesTable 7.31) The 10 represents the fixed characters, while the “n’” is variable(depending on the length of the text).7.3.4 Frequency Converter Address (ADR)Two different address formats are used.The address range of the frequency converter is either 1-31or 1-126.1. Address format 1-31:Bit 7 = 0 (address format 1-31 active)Bit 6 is not usedBit 5 = 1: Broadcast, address bits (0-4) are notusedBit 5 = 0: No BroadcastBit 0-4 = frequency converter address 1-312. Address format 1-126:Bit 7 = 1 (address format 1-126 active)Bit 0-6 = frequency converter address 1-126Bit 0-6 = 0 BroadcastThe slave returns the address byte unchanged to themaster in the response telegram.7.3.5 Data Control Byte (BCC)The checksum is calculated as an XOR-function. Before thefirst byte in the telegram is received, the CalculatedChecksum is 0.7.3.6 The Data FieldThe structure of data blocks depends on the type oftelegram . There are three telegram types, and the typeapplies for both control telegrams (master⇒slave) andresponse 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 toslave)- Status word and present output frequency (fromslave to master)ADRLGESTX PCD1 PCD2 BCC130BA269.10Illustration 7.6Parameter blockThe parameter block is used to transfer parametersbetween master and slave. The data block is made up of12 bytes (6 words) and also contains the process block.PKE INDADRLGESTX PCD1 PCD2 BCC130BA271.10PWEhigh PWElowIllustration 7.7RS-485 Installation and Set... VLT Automation Low Harmonic Drive Operating Instructions134 MG34O202 - VLT® is a registered Danfoss trademark77