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SYNAX 5.4 The fieldbus interface Profibus 5-3 Configuration of the real time channel In section 4.6 the configuration of the real time channel was generally discussed. If the parameter channel in Profibus is activated, then the first six words in the process data channel are reserved for this. Fig. 5-1 shows typical bus assignments for SYNAX applications. TVSGIWWHEXEGLERRIP ZEVMEFIP TEVEQIXIVGLERRIP IKJSVXVERWQMWWSRSJ HEXEEXTVSHYGXGLERKI GEQWXEVKIX TSWMXMSRW VIEPXMQIHEXEGLERRIP JSVXVERWQMWWMSRSJ G]GPMGEPHEXE <-3WQEWXIV E\MWTSWMXMSR JMIPHFYWGSRXVSP WXEXYW[SVH QYPXMTPI\GLERRIP JSVXVERWQMWMWSRSJ G]GPMGEPHEXE TSWMXMSRGSQQERH SJJWIXSJE\IW QYPMXTPI\GSRXVSP WXEXYW[SVH Fig. 5-1: Typical assignment of the 16 words in the process data channel 5.5 Multiplex channel The general features of the multiplex channel have already been described in section 4.7. This section decribes the bus-specific features of the multiplex channel with Profibus. Bus-specific are • the administration of the multiplex levels, • bit assignment of the multiplex control and status words and • the sequence in the multiplex channel with a level change. Administering multiplex levels With multiplexing are inside SYNAX active -according to the active index• the currently received data via the fieldbus entered in a data matrix (data direction PLC -> CLC) and • the data to be sent copied out of the data matrix onto the bus (data directiom CLC -> PLC). The administration of the data matrix and thus the multiplex index within SYNAX is possible with Profibus and DPF as well as on CLC. It is set via the SynTop dialog "fieldbus settings“ (correspond with bit 13 in "fieldbus control word" (C-0-0129)). Note: DOK-SNAX*-SY*-06VRS**-FK01-EN-P With the current hardware the administration of the mutliplex on the CLC is easier and faster for the user. Multiplex administration o the DPF is therefore hardly ever used anymore.
