Date Added: Nov 2009
Now-a-days, in the people highly automated, high-tech society, programmable logic controllers PLC are as common as their personal computers or laptops. They are more resilient and more compact than conventional computers, they can be programmed to be very specific tasks and they can be used in all kind of environments. The paper presents one of the built-in technologies that stand behind the remote operation capability of PLCs, namely the Ethernet module. A low cost flexible platform is build around this module. Two case studies are provided: a remote monitoring and control system for passive greenhouses and a PLC matrix for industrial applications.