There are many vendors and sources of PLCs: Automation Direct, FactoryMation, B&B Electronics, and yes, even eBay, among others. I will use the Click PLC available from Automation Direct as an example ...
CLICK Series stackable micro brick PLCs are now available from AutomationDirect with both Ethernet communications capabilities and analog I/O built-in. 12 new units provide both discrete and analog ...
Pricing starts at $69 and the unit has stackable I/O modules and free programming software. It features eight inputs and six outputs, available in four combinations of built-in I/O types. For ...