Thank you for the Idea of using a newer PLC but does the USD 100 includes software to? For spares I always have a unit on hand if I have a failure at a customer even if I robb my own home of a working Plc.elevmike said:The problem with using an obsolete PLC on a newer project is what will you do if/when the PLC fails?? It's probably best to use them for paperweights, and use a current model for new applications. Something like the DL05 cost ~$100.00 USD with the same I/O.