So you're using 24vdc relays to transfer the limit switches back to the computer
Yes, I have 24v coils and have 5v on the contacts.
and modbus out to the plc for communicating pulse and direction?
No, the Step/Dir are from either the parallel port if you use one or I use a SmoothStepper as it allows me to have a higher pulserate which means I dont have to use electronic gearing in my servo drive.
I'm incredibly familiar with Automation Direct as we have been going through a progressive process of eliminating AB PLCs and replacing them with various series from AD. And I'm also familiar with AC servo drives for more classic industrial solutions, so matched sets are my friend anyways.
I use the D0-06DR PLC from Automation Direct on my lathe and mill. I use it for signals such as enables and reset to drives and also signals from drives such as fault etc I also use it for FRO and SRO pots and all the switches I have on my panels.
Do you happen to have any good resources for breakout boards that you like and make integrating relatively easy?
I use the PMDX 122 but if doing another I think I would look at the PMDX 126 as its a dual port board and the SmoothStepper fits onto it and also I think it can handle 24v inputs, so 24v limits could go direct instead of through relays.
And other than that do you have drives and motors that you particularly like?
I have only ever used Allen Bradley DSD or Giddings and Lewis DSA drives, they are identical just a different name. As for motors I use Allen Bradley/G&L H series, F series, N series and MPL series. I have bought them all seconhand the most I have paid was £180 for a 22KW drive and £250 for a 12.5KW motor
Oh and as a side note, you use the PLC to communicate to the 24vdc to the drive, but your pulse and direction runs through your line driver into the master encoder input?
Step/Dir goes from computer to SmoothStepper (Via USB) to PMDX 122 breakout then line drivers then drive.
Hood