Alarm interface circuit

Alarm interface circuitry. As shown, the two-color light-emitting diode display. When LAi is high level t and LBi is low, the green light-emitting diode display; on the contrar

y, LAi low + LBi is high, LED display red; if both are high, showing yellow. Each system LED indicates a furnace, the temperature is normal green, high in red was in yellow t fall below the upper limit value. Thus, the operator can at any time according to the color-color LED display, find out whether or not each block annealing furnace is working properly. Display colors are controlled by the said C-8255A (PCO ~ PC7) and 8031 Pl port (P17 ~ P10) to complete.

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