NORD Drivesystems BU0090 - Manual (Page 51)

5 Data transfer / Parameter-string transfer
BU 0090 GB 51
5.5 Data transfer with USS reference data / Parameter range (PKW)
(only necessary for extended functionality)
The reference data (without telegram framework) correspond to the USS protocol.
Using the PKW mechanism, parameter processing can be carried out in the cyclical data traffic. For this the
master formulates an order and the inverter formulates the response to this.
In principle, the parameter range consists of a parameter identification, in which the type of order (Write,
Read etc.) and the relevant parameters are specified. Individual parameter sets or array elements can be
addressed with the aid of the Index. The parameter value contains the value to be written or read.
Note: A parameter order must be repeated until the inverter responds with the corresponding response
telegram.
5.5.1 Parameter label (PKE)
The order or response and the associated parameters are encrypted in the parameter label (PKE).
1 2 3 4
PKE IND PWE1 PWE2
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
AK PNU
SPM
The parameter label (PKE) is always a 16 bit value.
PNU: The bits 0 to 10 contain the number of the required parameter (PNU), or the number of the current
parameter in the response parameter of the inverter.
Note: For the inverter parameter numbers (PNU) please refer to the relevant operating instructions
for the inverter.
SPM: Bit 11 is the toggle-bit for spontaneous messages. This function is not supported!
AK: Bits 12 to 15 contain the order or response label.