NORD Drivesystems BU0090 - Manual (Page 60)

NORDAC AS-Interface Manual
60 BU 0090 GB
Example of reading direct parameters:
In order to check whether the direct parameter has been correctly transferred, a plausibility check should be
performed. For this, the corresponding index must be sent with the function Write Parameter. For the start-up
time P102 in parameter set 1, this would be the Index 0054
hex
. Only the Index needs to be transferred, i.e. the
number of parameter Bytes is 2.
In order to read out the parameter value P102, proceed as follows:
• Transfer the Index with Write Parameter
• Then read out the parameter value with Read Parameter
After the successful completion of the Write order, start the Read order with command number 41.
The Index and the parameter value are then output to the reception buffer.
Data Byte
in DB13 Value in
hex Meaning / Note
DBB228 04 Number of parameter bytes, 0A4
hex
corresponds to 04
dec
DBB229 00 Index:
DBB230 54 Index: start-up time P102, parameter set 1
DBB231 03 Parameter value: takes the resolution 0.01 into account
DBB232 E8 Parameter value: takes the resolution 0.01 into account
If subsequently, i.e. without a further Write order being started in the meantime, one or more Read orders are
started consecutively, the AS interface reads the corresponding parameter values consecutively according to
the Index sequence of the direct parameter table. The AS interface automatically counts up the index.
Note: This automatic Index increase only applies to the direct parameter function.
As a result, after the next Read Parameter String order, the parameter value P102, start-up time, is read out
from parameter set 2 in the reception buffer.
Data Byte
in DB13 Value in
hex Meaning / Note
DBB228 04 Number of parameter bytes, 0A4
hex
corresponds to 04
dec
DBB229 00 Index:
DBB230 55 Index: start-up time P102, parameter set 2
DBB231 07 parameter value, taking the resolution 0.01 into account
DBB232 D0 parameter value, taking the resolution 0.01 into account
Data Byte
in DB13 Value in
hex Meaning / Note
DBB4 40 Write the command number for the parameter string
DBB5 01 Slave address
DBB6 02 Number of parameter Bytes, 02
hex
DBB7 00 Byte 0: Index
DBB8 54 Byte 1: Index, start-up time P102, parameter set 1
Data Byte
in DB13 Value in
hex Meaning / Note
DBB4 41 Read the command number for the parameter string
DBB5 01 Slave address