Logic Circuits (Alarm and Status Modules) cont'd

TM 5-6350-262-14/9

NAVELEX 0967-466-9090

TO 31S9-4-32-1

state.

If a new alarm occurs, the resulting output

When the RESET/ACK switch is placed

from the impedance detector sets the set/reset latch B

momentarily in the RESET position, the set/reset latch A

which activates the audible signal buss and turns the

is reset. With both set/reset latches in the reset

oscillator and the output amplifier on. This causes the

condition, the oscillator and amplifier outputs are steady

lamp driver to flash the alarm lamps.

After

highs, and the lamp driver and alarm lamps are turned

acknowledging an alarm condition with the RESET/ACK

off. A reset can be accomplished only after an alarm

switch, and if the alarm condition changes to a no-alarm

has been acknowledged and the alarm condition no

condition, the impedance detector will not produce an

longer exists.

output and the circuits will remain in the acknowledged

6-5