Lenze 931W - Manual (Page 42)

Parameter channel (PCV mechanism)
Structure of the parameter characteristic value
Structure of parameter identification (PKE)
7

42 K-HB 13.0001-EN 2.1
7.2 Structure of the parameter characteristic value
When processing the PCV, a job identification, the corresponding PNU (parameter
number) and a value are transmitted. The job identification indicates if data of different
sizes are to be written or requested. The single job identifications are listed in Tab. 19. The
PNUs which are specified subsequently serve to define the object, the value to be changed
and the access. The PNU number (represented decimally) must be first converted into a
hexadecimal numerical format and can thus be processed directly or entered binary. Then
the basic structure of the PCV mechanism is shown. The procedure is to be explained using
an example.
Area Description
Parameter
characteristic
value (PCV)
PKE Parameter number (PNU) and job or response identification
IND Subindex and reserved area
PWE Since the higher-order bits (bits 16 ... 31) are not used, they must be set to ”0”. Lower-order
bits (bits 0 ... 15): Parameter values.
Tab. 15 Abbreviations - PCV mechanism
7.2.1 Structure of parameter identification (PKE)
The following table shows the binary structure of the PCV message:
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SPM
Job identification
Parameter number (PNU)
Tab. 16 Structure of parameter identification
Job identification Job or response identification (value range 0 ... 15)
SPM Toggle bit for spontaneous message processing
PNU Parameter number (value range 1 ... 1999)
7.2.2 Subindex
The subindex serves to ensure, e.g., an assignment to the correct parameter value in an
array
Bit 7 6 5 4 3 2 1 0
Value
Tab. 17 Subindex
7.2.3 Parameter value
The values of the individual objects are transmitted with the parameter value.
Byte 7 6 5 4 3 2 1 0
Value
Tab. 18 Parameter value