Probus DP V1 Agile 06/201032
Handling of the Objects
16.2.1 Operation Mode "Standard"
A parameter is accessed by its parameter number and data set number. The valid range for parameter
number is 0 … 1599, the range of data set number is 0 … 9.
Note: For the handling of data set selection see chapter 16.1.4 "
Parameters, Data Set Selection
and Cyclic Writing".
The standard mode uses the direct setting of Profibus node ID,
slot
and
index
. With the setting of the
two 8 bit objects
slot
and
index
the selection of parameter number and data set number for
read/write is done. The number of bytes to be transferred (read/write) depends on the parameter's
data type. In the case of a write cycle and an invalid number of bytes the CM-PDPV1 protoc
with an error message.
Calculation of slot and index:
Calculate an "application data index" ADI as a 16 bit unsigned integer with
ADI = (Parameter number + 1) + (2000 * (Data Set number + 1))
Calculate the value of
slot
and
index
with
slot = (ADI – 1) / 255
index = (ADI – 1) modulo 255
Example:
Parameter number = 480
Data Set number = 3
ADI = (480 + 1) + (2000 * (3 + 1)) = 8481
slot = (8481 - 1) / 255 = 33
index = (8481 - 1) modulo 255 = 65
The parameter data structure is explained above.
Access to Systembus:
The Standard Mode also offers a special functionality to obtain access to additional inverters via the
Systembus. For example, there exists one inverter with CM-
PDPV1 and several additional inverters
coupled to the first one via the Systembus.
This function can be implemented with CM-PDPV1 via the virtual parameter 1600.
After power on/reset this virtual parameter 1600 is set to zero. With 1600
accesses by V1 channel are allocated to the inverter with CM-PDPV1 itself.
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