To effectively prevent an erroneous signal from being transported when transporting a signal in a communication apparatus.

A communication apparatus includes: an output means (100) capable of outputting at least two signals, in parallel, containing information identical to each other as a signal for controlling a conveyance system; a plurality of transmission lines (210, 22) provided for output signals, respectively, for transporting the output signals, respectively; a plurality of filter means (310, 320) provided for the plurality of transmission lines, respectively, each for detecting an error in an output signal, passing a signal, as it is, in which no error is detected, and passing the error detected signal after deleting information; and a combination means (500) for combining the signals passed through the plurality of filter means into one signal, and outputting it.