| 摘要 |
PURPOSE:To maintain the function, performance and reliability of a redundancy system by estimating the rise of temperature of a control device and resetting the operation of the system to a degenerated operation mode or a normal mode based on the estimated temperature rise. CONSTITUTION:The analog signals of a temperature sensor 7 attached at the outside of a housing are periodically fetched by a process signal input/output part 331 in a control device 13. The peripheral temperature of the sensor 7 and this temperature rise rate are calculated by a controller part 332. Then the rise transition of the peripheral temperature of the device 13, i.e., the peripheral temperature of the device 13 to be set after a fixed time is estimated by knowing previously the information on the calculation of the part 332 as well as the information on the heat value generated within the housing, the heat transmission delay time to the housing, etc. The part 332 cuts off the power supply line of each subsystem by digital output signals 81 and 82 received from an input/output part in its own subsystem in response to the estimated temperature in case the temperature is liable to rise within the housing and this temperature rise may possible affect adversely the device 13. While the power is supplied to the subsystem when the estimated temperature T rises up to a normal level at the periphery of the device 13 and the operation is reset to a normal redundancy system.
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