Jtekt Corporation

Toyoda Koki Kabushiki Kaisha

Hidetoshi Kato

Hiroyuki Takahara

Yasunori Tsuboi

Tsuyoshi Yamashita

Masaharu Fujisaki

Tomohisa Kaneta

A programmable controller includes forward switching units and backward switching units. The forward switching units electrically disconnect forward communication wirings if a module is mounted on a slot connector, and electrically short-circuits the forward communication wirings if no module is mounted on the slot connector. The backward switching units electrically disconnect backward communication wirings if the module is mounted on the slot connector, and electrically short-circuits the backward communication wirings if no module is mounted on the slot connector.

Programmable controller

In a monitor apparatus for a sequential-function-chart-type programmable controller, a standard value of an active time of an arbitrary step in a sequential-function-chart program is stored, and the active time of the arbitrary step is measured during execution of the program. An anomalous state of the arbitrary step is detected through comparison between the measured active time and the reference value. Further, data indicating whether each step in the sequential-function-chart program has been executed are stored. The program is displayed such a manner that an anomalous step, a step or steps which have been executed, and a step or steps which have not yet been executed are distinguished from one another.

Monitor apparatus for sequential-function-chart-type programmable controller

Growing community of inventors

Kariya, Japan

Hidetoshi Kato