Siemens Sinumerik 840DiE sl - Constraints

01/2007
18.2 Expanded message frame configuration/evaluation of internal drive variables
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© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
18.2.6 Constraints
Die NC always occupies an entire slot. The data of the slot not used by the
NCK, e.g. data from the extended message frame configuration, cannot by writ-
ten by the PLC user program.
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 sl NC (actual value channel). You cannot transfer data in the other
direction, 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.
When the SINUMERIK 840Di sl boots, the NCK checks the consistency of the
parameters relevant to the process data configuration of the cyclic PROFIBUS
communication:
S NC
– MD 13060: DRIVE_TELEGRAM_TYPE[n] (drive message frame type)
S DP master (configuration)
– DP slave properties: Setpoint: Length
– DP slave properties: Actual value: Length
S Drive
– Message frame selection
– PDA setpoint assignment
– PDA actual value assignment
If the number of process data expected from the NCK set in the message frame
type parameter in the NC machine data:
S 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:
S DP slave properties: Setpoint: Length
S DP slave properties: Actual value: Length
or if the process data configuration for the drive parameters does not match the
message frame type for the NCK machine data, the following message is dis-
played:
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 NCK machine
data:
S MD13070: $MN_DRIVE_FUNCTION_MASK[n] (used DP functions)
then responsibility lies solely with the commissioning engineer to perform a con-
sistency check on the above–mentioned data.
Slot assignment
Restrictions
Check consistency
No acyclic
communication
possible
18 840Di–s
p
ecific Data and Functions