A coupler for a programmable logic controller connecting to an Ethernet network under the TCPIP protocol in order to communicate with various equipment. Before the relocation certain packet data information is transmitted between a terminal and a first network entity at least via a second network entity and via a third network entity. For example, first channelization may undergo down-clocking by a particular and desired ratio to generate a second channelization. The dielectric layer is made of fluoro type, polyester type or acrylic type resin binder. Using a network of ducts and holes on an intermediate plate situated just above the bottom place through which a stream of cool air is injected into said computer, the present invention makes it possible to effectively cool the dissipative areas and the identified hot spots on the electronic modules that it contains.