Cpu Time Load Through Dcc - Siemens SINAMICS DCM Operating Instructions Manual

● Step 5
● Step 6
● Repeat steps 5 and 6 on additional SINAMICS DCM drives.
10.31.2

CPU time load through DCC

Calculating the DCC blocks requires CPU time. If the CPU time becomes meager, you have
to check whether all the activated blocks are required and whether all the function blocks
used need to be computed within the same sampling time.
The CPU time load can be reduced by either deactivating blocks or assigning used blocks to
a runtime group with a longer sampling time.
A list of all of the DCC blocks available for SINAMICS DCM and the required computation
times are listed in Appendix B.
Table 10- 38 CPU time load DCC blocks left-hand CUD.
Time slice
1 ms
2 ms
4 ms
6 ms
8 ms
16 ms
This information applies to a left-hand CUD without additional options. These options increase the
1)
basic load of the CUD and reduce the available CPU time for the DCC blocks. Please refer to the
"CPU time load with the SINAMICS DCM" chapter for more information about the CPU load.
In this information, an average complexity of the blocks being used is assumed. If only highly
complex or very simple blocks are computed, the stated limit shifts accordingly.
SINAMICS DCM Control Module
Operating Instructions, 06.2010, C98130-A7067-A1-02-7619
Insert the Memory Card into the switched-off drive and switch on (POWER ON). The DCB
library is copied into the non-volatile memory (ROM) in the drive during power-up. The
process is complete as soon as the power-up has ended (operating state 7.0 reached).
Switch device off/on (POWER OFF / POWER ON). After the new power-up, the DCC is
ready.
Note
If DCC is installed in the drive, the power-up time increases by approx. 10 s.
Note
This procedure does not transfer the STARTER parameter assignments into the unit. In
order to transfer the parameter assignments from STARTER into the drive, the "Load into
the target system" function must be run in STARTER.
Number of optimized
blocks
50
100
200
300
400
800
Number of non-
optimized blocks
1)
10
20
40
60
80
160
Descriptions of functions
10.31 Drive Control Chart (DCC)
CPU time load
+30 %
+30 %
+30 %
+30 %
+30 %
+30 %
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