Boundary Conditions - Siemens SINUMERIK 840Di Manual

16 840Di Specific Data and Functions
16.2 Expanded message frame configuration (SW 2.2 and higher)
16.2.4

Boundary conditions

Restrictions
Consistency check
If the number of process data expected from the NC set in the message frame (telegram) type pa-
rameter in the NC machine data:
is greater than the number of process data configured with STEP7: HW Config for the DP slave
drive:
or if the process data configuration determined at the drive-end from the drive parameters:
does not match the message frame type of the NC machine data, then the following alarm is issued:
No acyclic
communication
possible
then responsibility lies solely with the start-up engineer to perform a consistency check on the above
data.
16-508
The following restrictions are applicable with regard to the "expanded message
frame configuration" function:
S
Additional data can only be transferred from the drive to the SINUMERIK
840Di NC (actual value channel). You cannot transfer data in the other direc-
tion, i.e. from the NC to the DP slave drive (setpoint channel).
S
You can only have read access to the drive data stored in the system vari-
ables.
At SINUMERIK 840Di boot, the NC checks the consistency of the process data
configuration (PDA) of the parameters relevant to the cyclic PROFIBUS commu-
nication:
S
NC
– MD 13060: DRIVE_TELEGRAM_TYPE[n] (drive message frame type)
S
DP master (configuration)
– DP Slave Properties > Configuration > Setpoint: Length
– DP Slave Properties > Configuration > Actual Value: Length
S
Drive
– Parameter P0922 message frame selection
– Parameter P0915[x] PDA setpoint assignment
– Parameter P0916[x] PDA actual value assignment.
S
MD 13060: DRIVE_TELEGRAM_TYPE[n] (drive message frame type)
S
DP Slave Properties > Configuration > Setpoint: Length
S
DP Slave Properties > Configuration > Actual Value: Length
S
P0922 message frame selection
S
P0915[x] PDA setpoint assignment
S
P0916[x] PDA actual value assignment
S
Alarm 26015 "Axis axis identifier machine data $MN_DRIVE_TELE-
GRAM_TYPE[index] value not permissible".
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:
S
MD 13070: DRIVE_FUNCTION_MASK[n] (used DP functions)
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
06.03