SU676997A1 - Abnormal situation signalling device - Google Patents

Description

The output of the element OR is connected to the first input of the element BROTHER, the output connected to the first input of the memory unit, the first output of which is connected through a power amplifier with an indicator. The second outputs of the memory block of each alarm cell are connected to the corresponding inputs of the OR element, the output through the matching block is connected to the second input of the BANNER element of each alarm cell, and the test button and the signal pickup button are connected respectively to the second inputs of the OR element and memory block of each cell alarms.

The drawing shows a block diagram of the proposed device for signaling an emergency.

The device consists of a sensor 1, an OR element 2, an indicator 3, a BAN 4 element, a memory block 5, a power amplifier 6 constituting each of the signaling cells 7, and a matching unit 8, a test button 9, a signal removal button 10, an OR element eleven.

Sensor 1 and check button 9 are connected to the OR element 2, and the output of the OR element 2 is connected to the first (enabling) input of the BANNER element 4. The output of the BAN 4 element is connected to the first (enabled) input of the memory block 5, the first (direct) output which is connected to the input of the amplifier 6 power, and to the output of the amplifier 6 - indicator 3. The second (inverse) output of memory block 5 is connected through the element OR 11 to the input of the matching unit 8, the output of block 8 - to the second (prohibiting) input of the element BANKS 4 The button 10 removal of the signal is connected with the inverse off input block and 5 memories.

 The device works as follows.

A single signal from sensor 1, triggered on the alarm parameter, through the OR 2 element arrives at the enable input of the BAN 4. element. If there is no single signal at the prohibitory input of the BAN 4 element, then the logical 1 signal is output at its output. the switching input of the memory block 5 switches it to such a state that the logical output signal also appears as a "1" signal. This signal is amplified by the power amplifier 6, which turns on the indicator 3. Simultaneously from the inverse output of the memory block 5, the logical signal "O through the OR 11 element passes to the input of the matching unit 8. From the output of the 8 block, the logical signal" 1 is fed to the prohibiting inputs of the BANNER 4 elements of all the 7 signaling cells, blocking the passage of single signals from sensors that triggered later. ,

When the sensor that triggered first on the alarm parameter returns to its original position, the indicator remains in the on state. The return of the circuit to the initial state is possible only in the absence of single signals from the sensors and is carried out by applying a single signal with button 10 to the inverse shutdown input of memory block 5. At the same time

the inverse output of the memory unit is set to a logical "1" signal, and on the direct output - a logical "O signal Indicator 3 is turned off, and at the output of block 8 a logical "O,

which, entering the prohibitory inputs of the elements of the PROHIBITION of 4 alarms, gives permission for the passage of signals from the sensors during their subsequent operation.

The circuit check button 9 supplies a single signal to the inputs of all the cells simultaneously. In doing so, both the elements of the circuit and the indicators are checked.

Expansion of functionality and increased reliability, which means that the original cause of the operation of the process protection system is memorized

for an unlimited time and check of the device’s performance, it is possible to analyze the causes of the emergency situation, since the operator is given information specifically about the first parameter from which the development of the emergency situation began, and also at any time, in the absence of signals from the sensors, check the device’s performance .

Expansion of functionality, together with increased device reliability, leads to increased reliability of the entire alarm and protection system, shortens troubleshooting time, and consequently, simple

equipment.

Claims (2)

1. USSR author's certificate number 382212, cl. G 08 B 23/00, 1972. 2. USSR author's certificate number 375671, cl. G 08 B 25/00, 1971.