Abstract: In one embodiment, a multiplex control device includes three or more control modules to execute same operations for same input signals, and a majority decision module to output an output signal that matches majority of output signals outputted by the control modules. Each control module includes an input module to convert an input signal into an input value, a first determination module to obtain input values from input modules of respective control modules to determine whether majority of input values among the obtained input values match, an operation executing module to execute an operation using the matched input value to generate an output value, a second determination module to obtain output values from operation executing modules of respective control modules to determine whether majority of output values among the obtained output values match, and an output module to convert the matched output value to generate an output signal.

Abstract: In one embodiment, a multiplex control apparatus includes first to Nth input modules to convert input signals to input values, where N is an integer of three or more, and first to Nth operation modules to operate the input values to generate output values. The apparatus further includes first to Nth output modules to convert the output values to output signals outputted to a majority decision module, and first to Nth power supply modules to supply power to the first to Nth input, operation and output modules, respectively. An Xth output module is configured so that an output signal line between the Xth output module and the majority decision module is placed in an open state that is a safe-side status, if power supply from an Xth power supply module to the Xth output module is at a stop, where X is an integer from 1 to N.

Abstract: A communication system includes a plurality of communication devices that transmits shared data in turn through wireless communication. Each of the communication devices includes a shared memory, a transmission processor, a reception processor, and a data comparator. The shared memory is capable of storing shared data for each of the communication devices. The transmission processor transmits the shared data of the communication device stored in the shared memory to a second communication device as another communication device. The reception processor monitors data as the shared data received by the second communication device from the communication device and transferred to a third communication device as another communication device other than the second communication device, and receives the data as monitored data. The data comparator compares the received monitored data with the data previously transmitted to the second communication device.

Abstract: In one embodiment, a multiplex control device includes three or more control modules to execute same operations for same input signals, and a majority decision module to output an output signal that matches majority of output signals outputted by the control modules. Each control module includes an input module to convert an input signal into an input value, a first determination module to obtain input values from input modules of respective control modules to determine whether majority of input values among the obtained input values match, an operation executing module to execute an operation using the matched input value to generate an output value, a second determination module to obtain output values from operation executing modules of respective control modules to determine whether majority of output values among the obtained output values match, and an output module to convert the matched output value to generate an output signal.