Good Idea but It only goes back to the 611 series mine is a 610. I did talk to siemens about this one and they believed it cold be done with some additional dac's. But there policy of no information and relying on closers.turned me pretty cold.I did find the pinout for the inverters,but it looks like they require a pwm for each phase (ac servos)So I'll have hack it somewhere else.The bookshelf Idea Is also good but the rest of the machine hard wire is in there.I just had a brain flash.I am thinking of useing small drives as a preamp to get the three pulses if I can find one that outputs pwm. thankyou I am open to any suggestions Al