New! 20-sim 4.7

20-sim 4.7 has been released on March 2, 2018. Read all about this new version here.

We’re adjusting pricing on March 1

We’re adjusting pricing on March 1st

Controllab will be adjusting the prices for 20-sim and 20-sim 4C beginning March 1. The average price raise in euros will be 5%. This reflects the cumulative inflation since we have last raised our prices in 2014.
If you want to lock in on our old pricing before the change is made? You can purchase new software or renew your annual maintenance contract before March 1 and we’ll honor our old prices. Just send us a PO before March 1st.

If you are interested in upgrading to a newer version of 20-sim, we'd be happy to honor our previous pricing till the mentioned date.
Do you have any questions or concerns? Just send us an email. We’ll get back to you quickly.
Thanks always, 
The Controllab Team

20-sim 4.6.4

20-sim 4.6.4 has been released. This build is a maintenance release with the following fixes:

4.6.4 (build 8004, July 26, 2017)

3D Animation

  • Fixed: Range issue in Spot Angle.

Code Generation

  • Fixed: Directly mapping to an R(ate)-variable if a submodel takes the integral/previous of an input.
  • Fixed: Initial equations in a FMU cannot influence initial states.
  • Fixed: Crash when running a generated FMU in a FMI 1.0 master simulator.
  • Fixed: FMU 2.0 Export: Table2D implementation for source code FMU does not work on Linux/MacOSX


  • Reference Manual: Fixed: Unclear statement about 'while do' and 'reapeat until'.
  • Reference Manual: Fixed: Orientation of Euler angles in 3D animation window (ZXZ instead of XYZ).


  • Fixed: Not saving a model when closing 20-sim during a simulation.
  • Fixed: A issue when writing a data file of multiple run results (parameter sweep).
  • Fixed: A issue that unnamed nodes can generate instructions for a continuous time block instead of the corresponding discrete block.
  • Fixed: A crash during a multiple run simulation with parameter sweep.

New! 20-sim 4.6

20-sim 4.6 has been released on December 9, 2015. Read all about this new version here.


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