Simulink mod function not working

I am trying to generate an angle between 0 and 2pi using a ramp input into the modulus with 2pi being the second input. The output of the mod block just saturates around 2pi. This has worked in the past.

[Arnab Sen]

Please refer to the following link:

http://www.mathworks.com/matlabcentral/answers/213275-linkaxes-much-slower-in-2015a?s_tid=answers_rc1

[Guillaume]

How is that link remotely relevant to the question?