Siemens SINAMICS DCM Manual page 630

Dc converter

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A list of all of the DCC blocks available for SINAMICS DCM and the required computation

times are listed in Appendix B.

Table 10- 63 CPU time load DCC blocks left-hand CUD.

This information applies to a left-hand CUD without additional options. These options increase the

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.

● The actual CPU time load of the CUD can be read out on r9976. Please refer to the "CPU

time load with the SINAMICS DCM" chapter for more information about the CPU load on

the SINAMICS DCM.

● To make own calculations, the above-illustrated CPU time loads can be taken as "linear".

This means that:

– half as many blocks in the same time slice generate half as much CPU time load, etc.

– the same number of blocks in time slices half as fast generate half as much CPU time

1. In the 1 ms time slice, 50 blocks generate about 30 % additional CPU time load. For that

reason, 50 blocks in the 2 ms time slice generate about 30 % × 0.5 = 15 % additional

CPU time load.

2. In the 7 ms time slice, (300 + 400) / 2 = 350 blocks generate about 30 % additional CPU

time load. That means 250 blocks generate 250 / 350 × 30 % = 21.5 % additional CPU

SINAMICS DCM DC Converter

Operating Instructions, 02.2015, A5E34763375/RS-AA/001

Number of blocks

ac.maher.co.ir

Descriptions of functions

10.36 Drive Control Chart (DCC)

CPU time load