Watch-dog timer circuit

Details Watch-dog timer circuit Watch-dog timer circuit

G - Physics

05

B

342/19.7

G05B 15/02 (2006.01) G06F 11/00 (2006.01) G06F 11/07 (2006.01) G06F 11/14 (2006.01) H03K 17/296 (2006.01)

Patent

CA 1190307

Watch-Dog Timer Circuit Abstract A watch-dog timer monitor for the control system of a power plant including a pulse monitor which measures the length of time between successive con- trol pulses from an output port of a computer. In the event that any control pulses exceeds the pre- selected time interval, the pulse monitor sends a disable signal through a latch to the buffers in the path of the control signals. The buffers instan- taneously transition to a blocked condition pre- venting any subsequent control pulses from reaching the control system of the power plant. A reset button is toggled to reset an initializer which restarts the program in the computer. A start-up delay is also provided to insure that no spurious control pulses reach the control system of the power plant during a warm-up period when the digital logic circuits are settling out.

408571

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