SU1265991A1 - Program time relay - Google Patents

Abstract

The invention relates to automation, to control devices of a technological process according to a program predetermined in time. The purpose of the invention is to simplify the relay. The relay contains a generator of 1 clock pulses, elements 2I-NOT 3 and 4, a counter 6 pulses, trigger 7 and elements 2I-NOT 8 and 9. The introduction of a generator 2 clocks and element 2 OR-HE 5 eliminates the decoder. 1 il. 2 (L to O5 joint venture with

Description

The invention relates to automation, to control devices of technological processes according to a program predetermined in time.

The purpose of the invention is to simplify the relay by eliminating the decoders.

The drawing shows the electrical circuit diagram of a software time relay.

The software time relay contains 1 and 2 clock pulse generators, logic elements 2 AND-HE 3 and 4, logic element 2 OR-NOT 5, counter 6 pulses, trigger 7, logic elements 2 EIA 8 and 9, and outputs 10 and 11 of the device. The outputs of the generators 1 and 2 clock pulses are connected to the first inputs of logic elements 2 AND-NOT 3 and 4, the outputs of which are connected to the inputs of logic element 2 OR-NOT 5, the output of which is connected to the input of the counter 6 pulses, the inverse output of which is connected to the second the input of the first logic element 2 AND-NOT 3, and direct - with the second input of the second logic element 2 AND-NOT 4, with the first inputs of logic elements 8 and 9 and with the counting input of the trigger 7, the outputs of which are connected to the second inputs of the elements 2 AND - NOT 8 and 9, the outputs of which are out Odes 10 and 11 devices.

Software time relay works as follows.

When the circuit is switched on, that clock generator starts operating at counting pulses, which has a logical 1 at the second inputs of elements 2 AND-NOT 3 and 4. The pulses from the second clock generator to the counter 6 pulses are not received, because the second input of the corresponding logic element 2 IS NOT the prohibiting level of the logic “O. After a predetermined time determined by the measured frequency of the generator

clock pulses, the first generator is disconnected from the pulse counter b, and pulses from the second clock generator begin to arrive at its input, the trigger 7 switches and the "Stop." signal appears at the output of the circuit. The next switching of the clock generators will give the signal “Rotation back, etc.

Changing the frequency of the generators allows you to smoothly change the ratio of the total rotation and stop time.

In general, the software time relay executes the following program:

forward rotation

HZ.

rotation back

Claims (1)

Invention Formula A software time relay containing a clock generator, a pulse counter, a trigger and four logic elements 2 AND-NOT, characterized in that, for the purpose of simplification, a second clock generator and logic element 2 OR-NOT whose inputs are connected to the corresponding outputs of the first and second logic elements 2 AND-NOT, the first inputs of which are connected to the corresponding “outputs of the first and second clock generators, the output of the logic element 2 OR — NOT connected to the input of the pulse counter, ersny output of which is coupled to a second input of the first NAND gate NAND 2 and the forward - with the second input of the second logical element 2 IS-NOT, the counting input of the trigger and the first inputs of the third and fourth logic elements 2 AND-NOT, the second inputs of which are connected to the corresponding outputs of the trigger, and the outputs are the device outputs.