Siemens SINAMICS Series Operating Instructions Manual page 662

Descriptions of functions
10.35 CPU time load with SINAMICS DCM
10.35.2 Computation examples
Example 1:
Project A is a single drive in a control cabinet. An AOP30 is located in the control cabinet
door. The motor has a pulse encoder, which is connected through the pulse encoder input
X177.41-48
Base load
AOP30
Internal encoder
Calculated CPU time load =
Approx. 24% remain free for use by the free function blocks and/or DCC blocks.
Example 2:
Project B is a single drive connected to an S7 via PROFINET. 3 TM31 modules are used for
terminal expansion. The sampling rates of the TM modules (p4099) are set to 4000 ms. In
addition, a configured DCC application in the drive is running, which comprises 50 blocks
and runs in the 6 ms time slice.
Base load
CBE20
3 × TM31 with p4099[1,2,3] = 500
DCC application: 50 blocks @ 1 ms
Calculated CPU time load =
The CUD is 82% utilized.
Note
The available CPU time can be expanded by equipping the SINAMICS DCM with a 2nd CUD
(right-hand mounting slot). See Chapter "Expanding the SINAMICS DCM to include a
second CUD (Page 628)".
660
70%
+4%
+2%
76%
70%
+1%
+6%
+5%
82%
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A