Hitachi, Ltd.

Hitachi Information & Control Solutions, Ltd.

Yasuyuki Furuta

Masakazu Ishikawa

Eiji Kobayashi

Masahiro Shiraishi

Shin Kokura

Satoru Funaki

Naoya Mashiko

Akihiro Onozuka

Masamitsu Kobayashi

Tatsuyuki Ootani

Takashi Umehara

Akira Bandou

Yuusuke Seki

Takenori Kasahara

Manabu Kubota

Akira Bando

Wataru Sasaki

Hiromichi Endoh

Yusaku Otsuka

Yasuhiro Kiyofuji

Katsumi Yoshida

Akihiro Ohashi

Yu Iwasaki

Hisao Nagayama

Atsushi Nishioka

Hisashi Terae

Akihiro Nakano

Shoichi Ozawa

Syuichi Nagayama

Fujiya Kawawa

Hidechiyo Tanaka

Takao Imazawa

Tatsuyuki Otani

In a control apparatus which transmits/receives data from a central processing unit via a serial transfer channel to a communication control unit, and groups/distributes data of input/output units from the communication control unit via a parallel transfer channel, the control apparatus initiates a diagnosing unit of the parallel transfer channel in response to an instruction issued from the central processing unit, and diagnosis the input/output units subsequent to the diagnosis of the transmission channel. Data input/output timing of the input/output unit is also instructed from the central processing unit, so that the central processing unit can suppress lowering of response speeds caused by the diagnoses, and can maintain the periodicity of the data input/output.

Control apparatus, control method and control program

A fault diagnosis apparatus and method capable of simultaneously detecting the fault of a multiplexer and the fault of an A/D converter and isolating and identifying causes of these faults, the multiplexer and the A/D converter being used in a multi-channel analog input/output circuit. Test-voltage values are inputted from a diagnosis-voltage input unit into the multiplexer and the A/D converter constituting an analog-signal conversion unit, the multiplexer having plural channels, the A/D converter converting outputs from the multiplexer into digital signals, the test-voltage values being different from each other for each channel of the multiplexer. Comparisons are made between the digital voltage values and the test-voltage values inputted, the digital voltage values being outputted for each channel of the multiplexer. From this comparison result, it is judged whether the multiplexer is at fault or the A/D converter is at fault.

Fault diagnosis apparatus and fault diagnosis method of multi-channel analog input/output circuit

A receiving device including: a receiver receiving two frames, each including substantially same data attached thereto with a data error detection code, a frame error detection code, and safety flag information indicating a safety function or not, respectively; a first detector connected to the receiver for performing error detection of the frames by use of the frame error detection code, respectively; a second detector connected to the receiver for performing error detection of the data by use of the data error detection code, respectively; and a Direct Memory Access Controller (DMAC) connected to the first and second detectors for outputting one among the data included in the two frames under a condition of the safety function in the two frames when no error is detected in the frame and data error detections.

Sending device, receiving device, communication control device, communication system, and communication control method

A programmable electronic controller in which one central arithmetic processing unit and a plurality of input devices and output devices are connected by means of a parallel bus, the controller being basically configured to activate a self-diagnostic function and a diagnostic test of the input devices and the output devices with an instruction from a microprocessor of the central arithmetic processing unit; and to judge the result with the microprocessor of the central arithmetic processing unit, by using the microprocessor installed in the central arithmetic processing unit also as a processor for tests (diagnostic tests) of the self-diagnostic function of the input devices and output devices and conducting tests of the self-diagnostic function of the plurality of input devices and output devices with the central arithmetic processing unit.

Communication control system and communication control method

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Naka, Japan

Yasuyuki Furuta