DCC and blocks

Technology Team

Hello Dikonis,

no, such a table is not available. The computing time load of the DCC blocks are slightly different because the code is of course not the same internally. I recommend to program the DCC chart, insert all blocks that you need, download the project to SINAMICS and then select a runtime group at p21000[0]. Afterwards you can see the whole computing time load of the DCC chart at r21005[0].

Hello,

technicalwise yes, each block (depending on the complexity) needs a certain amount of CU utilization (computation load).

But to make it easier for the user there is a rule of maximum 1500 blocks calculated on one device (CU320-2) in sum (e.g. 1000 blocks at a Servo + 500 blocks at a Line Module). (see DCC programming manual)

Of course the CU utilization highly depends on the selected DCC cycle times. It make a BIG difference whether the blocks are calculated in 1ms or in 32ms cycle time. The resulting utilization comes additionally to the load that is already given by the number of drive objects on the device (number of drives, cycle times for the drives, …)

So a general information cannot be given as there are so many dependencies for the utilization of the CU. For example check DCC example applications like DCC synchronism...There are a lot blocks used for calculation and in the documentation you can find example utilizations for the CU for certain amount of axes.

https://support.industry.siemens.com/cs/ww/en/view/109757232

Technology Team

Hello Dikonis,

no, such a table is not available. The computing time load of the DCC blocks are slightly different because the code is of course not the same internally. I recommend to program the DCC chart, insert all blocks that you need, download the project to SINAMICS and then select a runtime group at p21000[0]. Afterwards you can see the whole computing time load of the DCC chart at r21005[0].