Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1997-09-22
2000-02-08
Jackson, Stephen W
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361 62, 361 78, 361 93, 361115, H02H 500
Patent
active
060233990
ABSTRACT:
In a decentralized control system configuring a network between plural field devices for measuring and controlling the controlled objects and plural upper-level apparatus for communicating data to the field devices and controlling the field devices, and forming a control loop among the devices, in which the field device has a normal communication means for communicating with other devices in a normal operation mode, and an emergency communication means for communicating with other devices in an emergent operation mode, in which the normal communication means and the emergency communication means use their own communication signals and the emergency communication means operates in an asynchronous communication mode. In addition, on the network, a shutdown control means is formed for transmitting a shutdown command signal to the shutdown target control device if necessary by detecting the abnormal state of the individual devices.
REFERENCES:
patent: 4604693 (1986-08-01), Chadima
patent: 4634812 (1987-01-01), Hornburger
Hitachi , Ltd.
Jackson Stephen W
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