SU430423A1 - MULTI-CHANNEL TRANSMITTING DEVICE OF MECHANICS - Google Patents

Description

one

The device relates to the field of telemechic and can be used for information support in automated control systems (ACS).

The multichannel telemechanic transmitter allows the transmission of several parameters of the control object over a single communication channel, reduces the cost of the ACS and provides an increase in the amount of information collected at the central point of the control system. In the known transmitting multichannel telemechanic devices, the values of the parameters of the control object (telemetry, TI) are transmitted only cyclically. Thus, the value of a certain parameter, even if it does not change, is transmitted over the communication channel, is received and processed by the computing complex installed at the central point of the control system. Normally, in the normal mode, the object's parameters change slowly compared to the transfer rate of these parameters in multichannel telemechanics devices (these transfer rates are selected based on the maximum possible rate of change of parameters). The cyclic TI transmission mode leads to a significant increase in the load on communication channels due to the transmission of unnecessary information about the changing values of the parameters. In addition, on average, a large part of the mask time of the computing complex installed at the central point is spent on receiving and processing unnecessary information (about unchanged parameter values).

The proposed device allows sporadic transmission of telemetry.

In the sporadic mode of transmitting telemetry, a new parameter information is transmitted if, by the time of this transmission, the parameter change from the previous transmitted value of this parameter exceeds the certain value (e) in absolute value. Sporadic telemetry transmission allows to significantly reduce the communication channel load, significantly save the computing complex time and, consequently, increase the amount of information transmitted over communication channels, and provide real-time reception and processing of a significantly larger number of parameters than during cyclic telemetry transmission. .

This is achieved by adding an additional counter, shift registers and keys to the device, and the first counter is reversible, the sign and pulse outputs of the comparator being connected to the corresponding inputs of the reversing counter, the pulse output of the comparator to an additional counter, the output of which is connected to the output key . The outputs of the reversible counter are connected via keys to the inputs of the respective shift registers, and the outputs of the latter to the corresponding installation inputs of the reversible counter and to the other inputs of the keys.

The block diagram of the device is shown pa drawing.

It contains the unit / control, switch 2, comparator 3, reversible counter 4, analog-digital converter 5, transmission unit 6, the output of which is connected to communication channel 7, shift registers 5, keys 9, additional counter 10 and output key 11.

The device works as follows.

Let on the i-M sub-cycle (1 t p, where n is the number of podkapalov), switch 2 connects to the input of the comparator 3 the t-th tele measurement parameter. At the same time to the installation inputs of the reversible counter 4 from the outputs of the shift registers 8 receives the transmitted parallel code i-ro TI.

Thus, before starting the coding in the reversible counter, an initial value is set equal to the previous value of the coded parameter transmitted to the communication channel. Then it is encoded in an analog-to-digital converter. The pulse output of the comparator 3 generates pulses that are simultaneously transmitted to the input of the reversing counter 4 and the additional counter 10. The voltage level at the sign output of the comparator determines the counting direction in the reversing counter 4. The pulse output of the comparator produces pulses until the coded analog value supplied to the input of the comparator through the switch is not balanced by the analog value at the output of the analog-digital converter 4, i.e. the analog equivalent of the TI code, sod Equipped in a reversible counter 4.

Before starting the coding of the i-th tele-measured value, the additional counter 10 is set to the zero state. Therefore, by the end of the coding, the code of the absolute value of the increment of the encoded TI value in relation to the initial value entered into the reversible counter from the outputs of the shift register 8 is formed in the additional counter. The TI code from the output of the reversible counter enters also into the transmission unit 6, where after a time of time, the time interval set by the unit / control is converted from parallel to serial.

The serial code is transmitted to the communication channel only if the content of the high bit of the additional counter is equal to "1, i.e. if the parameter increment exceeds a predetermined value e. This is achieved by controlling the output key 11 at the output of the transmission block from the high additional counter If the transmitted value of the rth TI is received by the receiver and the reception confirmation signal is received, the code from the output of the reversible counter is entered into the shift registers through the keys 9 as a new value of the rth TI, the control unit shifts in the shift registers, in a reversible counter is set from the outputs of the shift registers the initial value of the (i + 1) -th TI. The switch goes to the (i + l) -e position, the additional counter is reset, and the (i + 1) -th subcycle starts (encoding and, if necessary, sending (i + 1) -th TI), if the same acknowledgment signal i- ro TI is not received, then not the inputs of the reversible counter are connected to the inputs of the shift register through the keys 9, but the outputs of the shift registers. Thus, as the initial value of the 1st TI in the shift registers, the same value that was entered into the counter at the beginning of the 1st sub-cycle is stored.

Further work of the scheme is as follows. However, after a cycle, if the value of the; -th parameter does not change, the same value of the rth TI is generated in the counter as in the previous cycle. Thus, a cyclic

transmission of each TI until confirmation of its receipt. Obviously, if the change in the rth parameter since the first transmission of its value does not exceed (e), then upon receipt of the acknowledgment signal, the transmission

that TI is stopped until the increment of the parameter reaches (c).

Subject and title

A multichannel telemechanic transmitter device containing a control unit, a switch whose output is connected to the first input of a comparator, the second input of which is connected to the output of an analog-to-digital converter, a counter whose outputs are connected respectively to the inputs of the analog-to-digital converter and to the inputs of a transmission unit whose output is connected communication channel, characterized in that, in order to unload the communication channel and increase the speed of the device, the locker is reversible in it and additional counter, shift registers and keys, the sign and pulse outputs of the comparator are connected to the corresponding inputs of the reversible counter, the pulse output of the comparator is connected to an additional counter whose output is connected to the output key, the outputs of the reverse counter are connected to the inputs of the corresponding shift registers whose outputs are connected with the corresponding installation inputs of the reversible counter and with other inputs

keys.

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