baracuta61
Member
I have a siemens s7-200 plc with an EM235 analog I/O unit with one analog output. At the moment this output is controlling the frequency of one allen Bradley 160ssc VFD. I want to control another 160ssc so that it mirrors the frequency of the first one. There is no analog output on the 160ssc that I can use to cascade the second VFD and I don't have another analog output on the PLC, is it ok to use the same anlog output from the EM235 for both VFD's? or does each one need its own output? (I think it would work ok linking the same output to both VFD's, but I want to know if it is acceptable practise to do this)