Siemens SINAMICS G110D, Руководство по эксплуатации

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Functions
6.11 Operation in fieldbus systems
SINAMICS G110D
Operating Instructions, 07/2016, FW V3.63, A5E36768472B AB
181
Cyclic Data Transfer
The CTT2 cyclic data stream allows four bytes in each direction to be transferred on a
regular basis between master and slave. The message between master and slave is 5 bytes
in each direction, first the code byte (00 or 01 depending on direction) and then the four data
bytes. Four bytes is sufficient for any single value parameter to be transferred but where the
parameter to be transferred is of a type shorter than four bytes the data is padded as
described in the figure below.
Image 6-38 Cyclic data transfer
In the inverter the four bytes from the master appear in read only parameter rxxxx and the
four bytes to the master are the value of the parameter pointed to by Pyyyy.
Pxxxx is not connected to any function by default but can be connected to any BiCo
connector input as required – e.g. setting the value of P1070 to xxxx would connect the main
inverter setpoint to the AS-i cyclic data from the master.
Image 6-39 Cyclic data output
Pyyyy is a BiCo connector input and has a value by default of 27. This means that, by
default, it is connected to P27 which is the filtered value of motor output current. Setting
Pyyyy to the number of any other parameter which is a valid BiCo data source will make the
value of that parameter appear in the AS-i cyclic data to the master.
Image 6-40 Cyclic data input