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4-20
User Manual CM-CAN1
4 Setting the device parameters
4.7 Downloading
parameter data
sets
Problem:
A unified valid data set - that is, not just individual parameters - needs to
be transferred from the master computer to the device. On every transfer
of an individual parameter the drive controller checks whether the param-
eter matches its existing data set.
The check of the new parameter value in part adds existing parameter
values. This means it is possible that the drive controller may reject a
parameter, even though it originates from a valid parameter data set,
because the parameter is not yet complete in the device. Possible error
messages are:
Since a simple error reset may not eliminate the cause of the error, it may
be necessary to reset to the factory defaults.
Remedy:
The new parameter data set of the master computer is transferred to the
drive controller without individual checking of the parameter values. When
the upload is finished the drive controller checks the now complete new
data set for plausibility. If the data are not logical, the entire data set is
rejected and the old data set is reactivated.
This procedure requires a handshake, which is described in more detail in
the following.
Note: In this action only parameters having the attribute “Card-
Writeable” are changed. Consequently, the upload of a
parameter data set by way of the serial interface runs in the
same way as by way of the S
MART
C
ARD
. If, during the upload,
a Select telegram is transmitted to a parameter without the
“CardWriteable” attribute, the drive controller responds to the
telegram with “Acknowledge” but does not adopt the new
parameter value.
Error Cause
E-PLS Plausibility error Parameter settings mutually implausible (control
parameters)
E-PAR Parameter setting error Parameter settings mutually exclusive in the
reference structure