[Problem]FX2N-2DA can't change the output

Hello
I'm using a FX1N-60MT and an extension FX2N-2DA. I have 2 output channels from 2DA to adjust my output voltage. The input range is 0-4000. The same code for both. However, only channel 1 can output any value I want. When I choose the input value with odd number ( Ex 1597, 2789,...), channel 2 will output the value and keep that value unchangeable after that. Can you tell me what error that is? Thank you so much.

http://www.plctalk.net/qanda/showthread.php?t=55961

http://dl.mitsubishielectric.com/dl/fa/document/manual/plc_fx/jy992d74901/jy992d74901g.pdf

It would help to have a view of your program. The above manual will show an example.
Regards,