SU839022A2 - Relay trigger - Google Patents

Description

The invention relates to automation and telemechanics, pulse and: computer technology and, in particular, can be used in the construction of control systems for technological processes and units. According to the main author. St. No. 627563 is known for a relay trigger containing a remote switch, the windings of which are connected in series with. The cathodes of the diodes are connected to the key input. The switching contact of the remote switch is connected to the control input of the key and to the clock input of the trigger. The starting and closing contacts of the remote switch and two input buses 1 are connected to the windings, respectively. The disadvantage of this device is that the contacts of the remote switch can hang, i.e. low reliability of work. The purpose of the invention is to increase the reliability of the relay trigger. The goal is achieved by the fact that in a relay trigger containing a remote switch, the windings of which are connected in series with diodes whose cathodes are connected to the key input, the switching contact of the remote switch is connected to the first control input of the key and to the trigger input of the trigger, they are connected to the windings start respectively, the closing and disconnecting contacts of the remote switch and two input buses, the element I is entered, the inputs of which are connected to all the buses, and the output to the second control yuschemu entry key. The drawing shows the functional diagram of the relay trigger. The relay trigger contains a remote switch 1 with a closing lei and a pair of contacts, diodes 2 and 3, a key 4 and an element 5. The input buses 6 and 7 are the information inputs of the trigger, input 8 is clocking. . The operation of the trigger (when the clock pulses are not supplied) occurs as follows. In the initial state, shown in the drawing, and the signal at input 6, the trigger state cannot be changed, because the key 4 is closed on its first control input by a signal on the bus 6 through the disconnecting contact of the remote switch that

prevents current from flowing through the corresponding relay coil. When switching input signals, i.e. removing the signal from input 6 and giving the signal to 7, key 4 at the first control input opens. As a result, a current flows through the appropriate winding of the relay. The remote switch transfers its switching contact to form a closed circuit: input 7 - opening contact - switching contact key 4. Key 4 closes and de-energizes the winding of switch 1.

Similarly, the trigger returns to its initial state upon the subsequent arrival of a signal at input 6.

In the presence of clock pulses at the input 8, the key 4 is closed and at the time of the actuation of the pulses it blocks the information inputs, while maintaining the previous state of the trigger.

If a situation arises when there are signals on both inputs of the trigger and the contacts of the switch are frozen, the AND 5 and

closes the key 4 at the second control input. Simultaneously, the supply of voltage to both windings of the remote switch is eliminated, and for this reason the lags of the contacts are eliminated.

The application of the invention allows to eliminate the mode of operation that is not permitted for a remote switch, to increase the reliability of the trigger.

Claims (1)

1. USSR author's certificate No. 627563, - cl. H 03 K 3/286, 03.05.77 6o