Dear @Matthew.Hall,
Hope you are doing well. I have some questions regarding MoorDyn module.

When i run OpenFast, i notice that fairlead tensions converged to 1% after 24 seconds. However, when i couple MoorDyn with MATLAB, and for the same position of the platform at t=0, the fairlead tensions converged to 1% after 16 seconds. Could you please explain to me why there is this difference in convergence knowing that, i am using the same input file (same parameters) ?

Does MoorDyn in OpenFast takes any other parameter than the platform position ? In fact, for the same platform position, OpenFast gives tension in mooring lines different for those given by MoorDyn when coupled with MATLAB. The following figure shows the fairlead tension obtained when coupling MATLAB with MoorDyn:
The following figure shows the fairlead tension obtained from OpenFast for surge equals 5 m at t=0:
 I read in MoorDyn user manual that it is possible to get the net forces on each connection (fairlead) like “con3fX” . I have tried in MATLAB the following command:
It gives me the following error:
Could you please tell me how should i write the syntax in MATLAB in order to tell MoorDyn to give me the net forces at each fairlead ?
Best Regards,
Riad