A system for conducting communication in a facility with equipment in hazardous and safe areas, the system comprising: a hazardous area and a safe area of the facility; a first field device and a second field device in the hazardous area of the facility; one or more controllers, located in the safe area of the facility, for managing the first and second field devices; and a field barrier, between the safe and hazardous areas, to limit at least electrical energy, which is supplied to the first and second field devices, at or below an electrical energy threshold in the hazardous area; characterized in that the system further comprises: a bus system to supply electrical energy across the field barrier to the first and second field devices using electrical wiring, and to enable Ethernet communication between all of the first field device, the second field device and the one or more controllers using one or more fiber optic cables, wherein each of the first and second field devices includes: a transmitter being configured to output a light signal onto one of the one or more fiber optic cables to be sent to the other one of the first and second field devices, or sent to one of the one or more controllers across the field barrier; and a receiver being configured to receive a light signal from one of the one or more fiber optic cables, originated from the other one of the first and second field devices, or originated from one of the one or more controllers across the field barrier. a hazardous area and a safe area of the facility; a first field device and a second field device in the hazardous area of the facility; one or more controllers, located in the safe area of the facility, for managing the first and second field devices; and a field barrier, between the safe and hazardous areas, to limit at least electrical energy, which is supplied to the first and second field devices, at or below an electrical energy threshold in the hazardous area; characterized in that the system further comprises: a bus system to supply electrical energy across the field barrier to the first and second field devices using electrical wiring, and to enable Ethernet communication between all of the first field device, the second field device and the one or more controllers using one or more fiber optic cables, wherein each of the first and second field devices includes: a transmitter being configured to output a light signal onto one of the one or more fiber optic cables to be sent to the other one of the first and second field devices, or sent to one of the one or more controllers across the field barrier; and a receiver being configured to receive a light signal from one of the one or more fiber optic cables, originated from the other one of the first and second field devices, or originated from one of the one or more controllers across the field barrier. a bus system to supply electrical energy across the field barrier to the first and second field devices using electrical wiring, and to enable Ethernet communication between all of the first field device, the second field device and the one or more controllers using one or more fiber optic cables, wherein each of the first and second field devices includes: a transmitter being configured to output a light signal onto one of the one or more fiber optic cables to be sent to the other one of the first and second field devices, or sent to one of the one or more controllers across the field barrier; and a receiver being configured to receive a light signal from one of the one or more fiber optic cables, originated from the other one of the first and second field devices, or originated from one of the one or more controllers across the field barrier. a transmitter being configured to output a light signal onto one of the one or more fiber optic cables to be sent to the other one of the first and second field devices, or sent to one of the one or more controllers across the field barrier; and a receiver being configured to receive a light signal from one of the one or more fiber optic cables, originated from the other one of the first and second field devices, or originated from one of the one or more controllers across the field barrier.