NORD Drivesystems BU0020 - Manual (Page 83)

7 Data transmission
BU 0020 GB-2612 83
7.5 Parameter range (PKW)
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. The parameter
area is only used for transfer with PPO type 1 and PPO type 2.
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.
WARNING
The maximum number or write cycles on the EEPROM of the frequency inverters is limited
to 100,000 cycles. Continuous writing to the EEPROM therefore results in the destruction
of the EEPROM.
Writing to the RAM of the frequency inverter should therefore be used for writing
parameter data. The setting for this is made in parameter P560 of the frequency inverter.
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7.5.1 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
SPM
PNU
The parameter label (PKE) is always a 16 bit value.
PNU Bits 0 to 10 contain the number of the required parameter (PNU), or the number of the
current parameter in the response telegram of the frequency inverter.
Note
For the inverter parameter numbers (PNU) of the particular inverter series please refer
to the relevant operating instructions.