Need help mapping analog output

Hello all,

I am currently trying to configure an analog output on EtherNet/IP in robotware 6.02. It is connected to a beckhoff module used for controlling the speed of a dc motor. the dc motor is for a wirefeeder. analog output is 16bits long. 0 to 647.47902 inches per minute needs to correspond to 0 to 255. the beckhoff module used is an EL7342 (Motor Controller). 

current configuration:

Max Logical = 647.47902
Max Physical = 255
Max Physical = 255
Max Bit Value = 255

All Min's are 0

I have tried different configurations and none of them yield proper scaling. Any help would be much appreciated
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