Looking at the example on the forum:
https://forums.temcocontrols.com/t/network-programming-overview/316
I think it will work out to something like this in your application:
10 VAR2 = 31MB_REG40101.
Let me know how this works out for you. The staff are all off till Feb 2 for the local break, we will help out more later if this doesnt work.