newbie: 90-20 to rslogix5000

so is there a way to convert the program from logicmaster 90-20 to rslogicx5000 or do I have to rewrite the code in rxlogicx5000?

To my knowledge there is no automatic conversion utility for the program. You will have to rewrite the code in RS 5000.
Note: Keep in mind that the 90-20 scanned the I/O synchronously and the RSLogix 5000 is asynchronous. Move the I/O to internal memory then use the internal memory locations in your logic.

Regards,

http://accautomation.ca/understanding-the-plc-program-scan/

The above will explain the scan of I/O.