SU468278A1 - Device for recording attendance of classes - Google Patents

Description

(54) DEVICE FOR REGISTRATION ATTENDANCE OF ACTIVITIES

 Iequirente refers to tele-i control systems and can be used, in particular, to attendance of students in educational institutions.

f The devices for monitoring occupancy are known - 5; the total audience and attendance of students, the containing blocks of peripheral sensors, which include decadal keys, one. Nameless contacts of which are connected in parallel and connected to the corresponding inputs of the code converter and cathodes of digital BbDc lamps of the memory block, a multiwire communication line connected between the auditorium and the memory block.

 However, the design of these devices is a slit} 5 on, which is due to the parallel transmission of information, which causes the need to bridge the use of a multicore cable, large numbers etc. 11cort | we will have time for addressing and informatization from each 20; the audience being audited to the corresponding cell of the memory blr and. etc.,

In the proposed device introduced highlight; underwater, switch and c. sensor blocks g relays, and the windings of the relay. are connected inter-; 25

are connected to the B1 1 input of the delay unit and to the control inputs of the counters of units and tens and the switch; not so, the inputs of the ten-day switches of units and tens in the sensor blocks are connected to the outputs of the switching contact of the relay, the common terminal of which is connected to the corresponding output of the switch the scan switch inputs are connected to a four-wire communication line, one group of switch outputs is not connected to the unit counter, the other is connected to the counter ten, and the input of the delay unit i is connected to switch yuigam vyho; house oprova switch.

The drawing shows a functional diagram of the proposed device.

 It contains sensor blocks 1 - i, cx &

1 switch 2 polls, switch 3 reads, counters 4, 5 units and tens, decoders 6, 7 units and tens, qi (| I level indicators 8, 9 units, and tens, I totalizer 1о, block 11 of totalizer indicator , delay block 12, block 13 | 15, 15; encoders and tens, decade switches 16 17-- 17y, units and tens, switching contact 18., - 18 relays, 19.-19, four-wire line 20 w Nodes 14, 15, 1.6, 17, 18, 19 are included in the composition of each sensor block 1-1. The sensor blocks 1-1 are located in controlled auditoriums and in each of them there is a relay 19c switching contact 18, which commutates in time the inputs of two diode encoders 14 and 15. Shifters 14 and 15 convert the decimal codes set by the corresponding decade switches 16 and 17 into parallel binary codes. all encoders are connected and form a four-wire communication line 20 common for all sensors with subsequent nodes. The resulting information from each monitored audience is as follows. The interrogation switch 2 supplies the corresponding sensor unit l | j with a positive field voltage p-. It goes through the opening contact 18 to the decade unit switch 16, which is fed to one of the units of the encoder unit 14 installed on the switch, which causes In a four-wire line binary code. The code value corresponds to the decimal single-digit number set on the encoder of units 14. This code through the read switch 3 is stored in the counter 4 parallel code units. Then, using the decoder of units 6, the binary code is transformed into a decimal one and enters the display device on a digital indicator of units 8, which serves to represent the discharge of units of the monitored number of the missing ones. In a similar way, the reading of the discharge of tens is carried out. Reading of this bit is performed with a delay after setting the number of units. For ET01U, the signal of the delay unit 12 connects the negative field voltage to the common power wire of the windings, the relay of all sensors. As a result, the switching contact 18 is connected to the switch 17 and the code corresponding to the discharge of tens of the monitored number is fed to the input of the timing switch 3. Using the switch read 3 at the time of arrival of the signal from the delay block 12, the inputs of the unit and tens counters, 4 and 5 are switched and information is entered into the counter of tens 5 and then into the decoder of tens 7. From the output of the decoder of tens of 7 information presented The decimal code enters the digital indicator of the decimal 9. Thus, on the indicators 8 and 9, a two-digit decimal number will be displayed corresponding to the number set on the decade switches of the audience sensor 16 and 17. The system will remain in this state until the signal to switch polling switch 2 (call to a different audience) follows. When the switch of polling switch 2 is switched on, a fault signal is generated, which reset blocks 4, 5, 12, and therefore read switch 3. The control unit 13 changes the operating mode of switch 2, cyclical or selective polling of sensors. In the case of selective polling, the control unit 13 generates a signal that disables the adder 1O. The latter is provided to eliminate the distortion of statistical data (the total number of students who are absent from classes) during repeated selective polling. The specified device using a four-wire communication line allows for monitoring 1O audiences, while providing selective and statistical control of audience occupancy and attendance. The subject of the invention. A device for recording attendance of occupations, containing sensor blocks, each of which consists of ten-day unit and tens switches, the outputs of which are connected to the inputs of encoder units and tens, respectively, the same-name outputs of all encoders are interconnected and connected to four-wire communication lines, control unit, one output of which is connected to the input of the polling switch, the other - to the control input of the adder, the first two inputs

which are connected to the outputs of the counters of units and tens, respectively, and the output; the adder is connected to the display unit of the adder, the outputs of the counters, the units a and dv. with the appropriate unit and the decoupler units are connected to the first indicators of the units and tens, characterized in that, in order to simplify and increase the reliability work, it introduced the delay unit, the switch. readout and sensor blocks - relays, the relay windings are interconnected and connected to the output of the delay unit and to the control inputs of the counters of units and distances: from the switchboard switch, the inputs of the ten-day switches of units and tens in the blocks of sensors are connected to the terminals {Switch contact the relay, the common output of which is connected to the corresponding output of the polling switch, the inputs of the link switch are connected to the four-wire communication line, one group of outputs of the read switch is connected to the counting unit, another - a tens counter and the input of delay .bloka connected to a switching output switch oavos