Trying to store data from the front port of a Mitsubishi PLC (A series) via ActiveX app. I need to be able to periodically program the PLC thru the same port. Does anyone know of a multiplexer, port expander (something fairly inexpensive - we have many to do, want to try to avoid slot mount solutions) that would work?

 

see "www.moxa.com":http://www.moxa.com
They got comprehensive port expanders.