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User Manual CM-CAN1
4-13
4 Setting the device parameters
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4.5 Telegram
execution and
verification
Data transfers are acknowledged by reply telegrams containing the same
data content and the parameter number. Only data byte 2 of the reply dif-
fers, no longer containing the transfer mode but the STATUS instead.
The STATUS byte indicates whether the transfer was successful or what
problems occurred (see also section 4.5, Parameter channel).
Generally a reply is sent only after successful entry of the new parameter
value in the drive unit.
Mode-related access restrictions
If bit 6 (hexadecimal value 40 H) in the STATUS byte is set in a reply tele-
gram, write access to the parameter concerned was refused irrespective
of the transmitted value.
This in turn does not necessarily mean the parameter is generally write
protected. It may be that write access was refused merely based on the
current operating state of the device.
Note: For details of which parameters are writable when, refer to
the Application Manual.