CLICK PLC is the latest Great PLC from Koyo Electronics which compliments an already stellar line-up of PLCs.
With a starting price of $69 for a discrete controller w/ 8 built-in digital inputs & 6 built-in digital outputs,
this stand alone, Micro Brick PLC is by far the most practical PLC for the money.

Choose from seven CPU Models with various I/O types
Optional Power Supplies and Option Modules allow expansion for up to 142 I/O points