Now there is a replacement, which is the CU240E-2. However, it does not include an encoder input. So my ownly other option would be to use four CU305's. However, it adds 600 dollars per machine. and we have a total of 4 machines to retrofit. Which then adds $2,400 for the entire project. 

So, the question being, is there another drive system/setup that would be more cost effective than having to use four 305's. Now, I probally can return the PM's but not the PLC's. (the PLC's were purchased a long time ago now)

I've looked into using a CU320, but after the controller, line module, and drive modules, plus an S7-300 and TIA V11 Proff. The cost gets way to high. 

Then I looked at doing a D425, but same issue, plus have to then add three SM modules for the encoder evaluation from the third party motors to the drive units. So again, the price gets far to out of control.

So I hope theres someone out there who knows more than I do!

Thanks in advanced!