Mitsubishi Denki Kabushiki Kaisha

Hiroyuki Kagami

Tatsumi Yabusaki

Kouichi Itou

Hideaki Morita

Kumiko Funahashi

Motohiro Kaga

Takashi Nonoyama

Hiroki Sugamata

Eijiro Nakajima

A CPU unit comprising a microprocessor for controlling a controlled system according to a stored sequence program and predetermined data, and a memory area where the sequence program and predetermined data are stored and a second sequence predetermined data both used by a preset operation proxy controlled unit are stored, wherein when the microprocessor detects an abnormality of the operation proxy controlled unit, the microprocessor controls the operation proxy controlled unit according to the second sequence program and second predetermined data after the microprocessor ends the predetermined processings of the unit.

CPU unit and run alternative control method of programmable controller

A system ROM stores a control program for measuring an internal operation state of a CPU unit, and a data RAM stores a measured internal operation state of the CPU unit. The internal operation measuring control program enables the internal operation state of the CPU unit to be measured in response to a monitor processing request from an external peripheral device, and a measurement result to be sent to the external peripheral device, to thereby allow the external peripheral device to monitor the internal operation state of the CPU unit.

Programmable controller allowing an external peripheral device to

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Tokyo, Japan

Hiroyuki Kagami