Siemens sinamics dcp Operating Instructions Manual page 261

CPU time load through DCC
Calculating the DCC blocks requires CPU time.
The following table shows a guide value for how many blocks can be computed in a single
time slice.
In this information, an average complexity of the blocks being used is assumed. If only highly
complex or very simple blocks are computed, the value decreases or increases accordingly.
Time slice
1 ms
2 ms
4 ms
6 ms
8 ms
16 ms
● The actual CPU time load of the CUD can be read out on r9976.
● 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 a half as fast time slice generate half as much CPU
Memory load through DCC
The DCC blocks require storage space.
The following table shows a guide value for how many DCC blocks are permitted when only
a single drive object contains a DCC chart.
Drive Object
CU_DCP
DCP_CTRL
The final limits are determined by the total memory available on the CUD. If the above-
mentioned maximum limits are exceeded, this can result in errors during upload or download
(e.g. fault F1105: CU memory insufficient) and the SINAMICS DCP can no longer be
switched on; a Power OFF/ON must be performed.
Note
In most cases, the CPU time load of the CUD is the limiting factor, not the memory load.
SINAMICS DCP
Operating Instructions, 05/2016, A5E34382853K
time load, etc.
8.15 Drive Control Chart (DCC) for SINAMICS DCP
Number of blocks
50
100
200
300
400
800
Number of DCC blocks
800
600
Operation
261