Communication device for an industrial communication network which can be operated in a redundant manner, having - at least one first and one second transmitting and receiving unit (11, 12) each having an interface for a network connection of the industrial communication network, both transmitting and receiving units having an identical network address and an identical device identifier, - a signal processing unit connected to the first and second transmitting and receiving units for bumplessly transmitting data inside the industrial communication network, the signal processing unit having a multiplexer unit for forwarding data packets to be transmitted to both transmitting units in a parallel manner and a redundancy handling unit for processing data packets received by both receiving units, and the redundancy handling unit comprising a filter unit which is set up to detect received redundant data packets, - in which at least one network connection connected to the signal processing unit via a coupling element for an automation device, characterized in that - the first and/or second transmitting and receiving unit(s) is/are set up for bumpy and bumpless data transmission inside the industrial communication network and can be selectively changed over to a bumpy or bumpless transmission mode, each data packet only being duplicated in the bumpless transmission mode by a transmitting communication device and being sent to a receiver on two different paths, - an evaluation unit is connected to the first and/or second transmitting and receiving unit(s) and is set up to detect data packets to be transmitted in a bumpy or bumpless manner inside the industrial communication network, a data packet to be transmitted in a bumpy or bumpless manner having an identification for a respective transmission mode at least in a predetermined data field, - the redundancy handling unit and the filter unit are deactivated when a data packet to be transmitted in a bumpy manner is detected, - is the redundancy handling unit set up to forward data packets received by both receiving units to the coupling element without buffering, - a memory unit is assigned to the first and/or second transmitting and receiving unit(s) and is set up to buffer at least one data packet to be transmitted in a bumpy manner during a predefined period of time in the bumpy transmission mode. - at least one first and one second transmitting and receiving unit (11, 12) each having an interface for a network connection of the industrial communication network, both transmitting and receiving units having an identical network address and an identical device identifier, - a signal processing unit connected to the first and second transmitting and receiving units for bumplessly transmitting data inside the industrial communication network, the signal processing unit having a multiplexer unit for forwarding data packets to be transmitted to both transmitting units in a parallel manner and a redundancy handling unit for processing data packets received by both receiving units, and the redundancy handling unit comprising a filter unit which is set up to detect received redundant data packets, - in which at least one network connection connected to the signal processing unit via a coupling element for an automation device, - the first and/or second transmitting and receiving unit(s) is/are set up for bumpy and bumpless data transmission inside the industrial communication network and can be selectively changed over to a bumpy or bumpless transmission mode, each data packet only being duplicated in the bumpless transmission mode by a transmitting communication device and being sent to a receiver on two different paths, - an evaluation unit is connected to the first and/or second transmitting and receiving unit(s) and is set up to detect data packets to be transmitted in a bumpy or bumpless manner inside the industrial communication network, a data packet to be transmitted in a bumpy or bumpless manner having an identification for a respective transmission mode at least in a predetermined data field, - the redundancy handling unit and the filter unit are deactivated when a data packet to be transmitted in a bumpy manner is detected, - is the redundancy handling unit set up to forward data packets received by both receiving units to the coupling element without buffering, - a memory unit is assigned to the first and/or second transmitting and receiving unit(s) and is set up to buffer at least one data packet to be transmitted in a bumpy manner during a predefined period of time in the bumpy transmission mode.