Download SINUMERIK 840Di Manual Release 03/2004

16 840Di–Specific Data
16.2 Expanded message frame configuration
16.2.4
03.04
Restrictions
Restrictions
The following restrictions are applicable with regard to the ”expanded message
frame configuration” function:
Additional data can only be transferred from the drive to the SINUMERIK
840Di NC (actual value channel). You cannot transfer data in the other direction, i.e. from the NC to the DP slave drive (setpoint channel).
You can only have read access to the drive data stored in the system
variables.
Consistency check
At SINUMERIK 840Di boot, the NC checks the consistency of the process data
configuration (PDA) of the parameters relevant to the cyclic PROFIBUS communication:
NC
–
MD 13060: DRIVE_TELEGRAM_TYPE[n] (drive message frame type)
DP master (configuration)
–
–
DP Slave Properties > Configuration > Setpoint: Length
DP Slave Properties > Configuration > Actual Value: Length
Drive
–
Parameter P0922 message frame selection
–
–
Parameter P0915[x] PDA setpoint assignment
Parameter P0916[x] PDA actual value assignment.
If the number of process data expected from the NC set in the message frame
(telegram) type parameter in the NC machine data:
MD 13060: DRIVE_TELEGRAM_TYPE[n] (drive message frame type)
is greater than the number of process data configured with STEP7: HW Config
for the DP slave drive:
DP Slave Properties > Configuration > Setpoint: Length
DP Slave Properties > Configuration > Actual Value: Length
or if the process data configuration determined at the drive–end from the drive
parameters:
P0922 message frame selection
P0915[x] PDA setpoint assignment
P0916[x] PDA actual value assignment
does not match the message frame type of the NC machine data, then the following alarm is issued:
Alarm 26015 ”Axis axis identifier machine data
$MN_DRIVE_TELEGRAM_TYPE[index] value not permissible”.
No acyclic
communication
possible
If acyclic communication is not supported by a drive, or if acyclic communication
was not explicitly deactivated for a drive via the axis–specific NC machine data:
MD 13070: DRIVE_FUNCTION_MASK[n] (used DP functions)
then responsibility lies solely with the start–up engineer to perform a
consistency check on the above data.
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 Siemens AG 2004 All Rights Reserved
SINUMERIK 840Di Manual (HBI) – Edition 03.04