WAGO and Controls [India] Ltd. Offers Programmable Fieldbus Controller for Ethernet. 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 Programmable Fieldbus Controller for Ethernet has Peripheral equipment that can be controlled directly, resulting in faster system response times. The programmable fieldbus controller for Ethernet combines the fieldbus coupler for Ethernet with the functionality of a PLC. The use of decentralized control can better support a PLC or PC.