ABB NIBA-01 Installation And Startup Manual

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ABB NIBA-01 Installation And Startup Manual Manual pdf 25 page image

NIBA-01 Installation and Start-up Guide6-1Chapter 6 – CommunicationOverview This chapter describes the messaging used in InterBus-Scommunication. Further information is available from the host controllerdocumentation, Phoenix Contact (http://www.phoenixcontact.com),and the INTERBUS Club (http://www.interbusclub.com).Interbus-SMessage FrameThe Interbus-S system employs so-called summation frames. The hostcontroller cyclically sends a message frame that includes the processdata for every module on the bus. The frame is constructed by the hostcontroller using the configuration data entered previously for eachmodule on the bus.As the message frame is relayed through the system, each device onthe bus stores the information addressed to it in a buffer and respondsby writing a response message into the same position in the frame. Asthe message frame returns to the host controller, it is checked againstthe original message.Figure 6-1 InterBus-S message frame.LOOPCHECKPROCESSDATAMODULE 1 MODULE 2 MODULE 3 MODULE n-1 MODULE nFRAMEPROCESSDATAPARAM-ETERHEADERSERVICEINDEXVALUECONTROLPARAM-ETERHEADERSERVICEINDEXVALUEPROCESSDATAPROCESSDATA2nd CYCLE3rd CYCLE4th CYCLE5th CYCLEINOUTBYTE 8BYTE 7BYTE 6BYTE 5BYTE 4BYTE 3BYTE 2BYTE 1PCP CHANNEL*PCP CHANNEL*DATA SET 1 DATA WORD 2 (DW 1.2)REFERENCE 1 (REF1)DATA SET 1 DATA WORD 1 (DW 1.1)CONTROL WORD (CW)DATA SET 1 DATA WORD 3 (DW 1.3)REFERENCE 2 (REF2)DATA SET 2 DATA WORD 1 (DW 2.1)STATUS WORD (SW)DATA SET 2 DATA WORD 2 (DW 2.2)ACTUAL VALUE 1 (ACT1)DATA SET 2 DATA WORD 3 (DW 2.3)ACTUAL VALUE 2 (ACT2)2 BYTES 2 BYTES 4 BYTES 4 BYTES 8 BYTES 2 BYTES 2 BYTES 2 BYTESCHECKSEQUENCEPROCESSDATA*USED IN PCP MODE ONLY.SEE PCP SERVICESSUPPORTED BY NIBA-01BELOW.