Siemens 6RA7086-6KS22 Operating Instructions Manual

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Function descriptions 05.059-24 SIEMENS AG 6RX1700-0AD76SIMOREG DC Master Operating InstructionsUSS:A maximum of 32 nodes can be connected in the bus configuration (i.e. 1 master and max. 31 slaves).The bus connector must be activated on the two bus nodes which form each end of the bus circuit.Peer-to-peer:Up to 31 other drives can be connected in parallel to the transmit cable of one drive. With a "parallelconnection", the bus connector must be activated on the last connected drive.9.13.1 Serial interfaces with USS® protocolSpecification for the USS® protocol: Order No. E20125-D0001-S302-A1The SIEMENS USS® protocol is implemented in all digital converter devices supplied by SIEMENS. Itcan be used to provide a point-to-point or bus-type link to a master station. Any mixture of convertertypes can be connected up to the same bus line. The USS protocol makes it possible to access allrelevant process data, diagnostic information and parameters of the SIMOREG converter.The USS protocol is a pure master-slave protocol. In this case, a converter device can only everfunction as slave. Converter devices will transmit a telegram to the master only if they have receivedone from it first. In other words, converters linked via the USS protocol cannot exchange data directlywith one another (they can do this only via a peer-to-peer link).Useful data which can be transferred via the USS protocolSheets G170 to G172 in Section 8 show how useful data can be interconnected and list theparameters relevant for configuring USS interfaces.If parameters need to be read and/or written via the USS interface, then "Parameter data length"(P782, P792, P802) must be set to 3, 4 or 127 (select setting 4 only if double word parameters need tobe transferred). If parameters do not need to be transferred, the "Parameter data length" must be setto 0.The number of process data words to be transferred is basically identical for the transmit and receivedirections and can be set in "Process data length" (P781, P791, P801). Numeric representation "100%equals 4000h = 16384d" applies to all connectors.Transfer of double-word connectors:In the receive direction, the values of any two adjacent connectors (K) are combined to form a double-word connector (KK) (e.g. K2002 and K2003 to KK2032). These double-word connectors can beconnected in the usual way to other function blocks. For details of how to connect with double-wordconnectors, see Section 9.1, subsection "The following rules apply to the selection of double-wordconnectors".In the transmission direction, a double-word connector is applied by entering the same double-wordconnector at two contiguous indices of the selection parameter.Examples:.04.01.03.02P78432401K0032KK9498KK9498K0401WordL-WordWordH-Word94989498KKKK.04.01.03.02P784WordH-WordWordH-Word2 differentdouble-word connectorsK0032KK9498KK9499K04013240194989499KKKK