The OMRON CPM2C-24EDTM is an Expansion I/O Unit designed for use with CPM2C Series programmable logic controllers (PLCs) . This unit provides a combination of 16 DC inputs and 8 sinking (NPN) transistor outputs, expanding the I/O capacity of the CPM2C CPU unit. It connects to the expansion connector on the right side of the CPM2C CPU via a ribbon cable .