IS200HSLAH2ADE Gas turbine electric

　　The principles of sending data are: The DSP’s DATs are updated, for example from PC program. The DSP data base is scanned and the data of the referenced DATs is written to the CDP. The data is then sent on the bus. Receiving data is performed the other way around. IDENT and STATION forms the signal identity which is the identifier of the DataSet Peripheral on the Advant Fieldbus 100. The signal identity must be equal on the sending and receiving DSPs. A signal identity must be unique for one DSP on one bus within one Advant Controller. On a bus a signal identity can be used by one sending only, and by several receiving DSPs. This gives the possibility to send data from one node and listen to it at several nodes, that is DataSet Peripherals are broadcasted on the bus

  The VALID flag is initially cleared 

and is set when data is sent or received. For receiving DSPs the VALID terminal specifies whether the current data of the DSP is valid or not. The VALID flag is cleared when no data has been received within the last four cycles (CYCLETIM) or when update data from the communication interface has failed. For sending DSPs the VALID terminal is set when the data has been written to the communication interface. VALID is cleared in case update to the communication interface has failed The ERR terminal specifies whether the DSP is in error state or not, typically caused by communication error between the DSP task and the communication interface or error in configuration of the CDP on the communication interface. As the DAT elements merely represent the interpretation of the data in the DSP and not the communication aspects, they will not be discussed further in this manual. An other function for transmission of data, DataSet (DS), exists. DS can only be used for communication between Advant Controller 110 stations. DS is quite similar DSP.

Defining DataSet Peripherals in the Advant Controller 400 Series

 When defining DSPs, the associated data base element is automatically given a unique name. The name can be changed by the user, and the associated DAT elements are automatically defined.The terminal CYCLETIM controls the transmission interval of a DSP (that is how often the CDP is transmitted on the Advant Fieldbus 100). The CYCLETIM range, in Advant Controller 400 Series, is 32, 64, 128, 256, 512, 1024, 2048 and 4096 ms.

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