WAGO and Controls [India] Ltd. Supplies TCP/IP Eco Fieldbus Coupler. WAGO and Controls [India] Ltd. Supplies Connectors and Terminal Blocks, PCB Type Connectors, Power Supplies, Male-Female Connectors, Din Rail, Markers, Relay-Cards etc. The TCP/IP Eco Fieldbus Coupler is capable of supporting all I/O modules. The Bus coupler automatically configures, creating a local process image which may include analogue, digital or specialty modules. Analogue and specialty data is sent via words and/or bytes, digital data is sent bit by bit.