JPH03956B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention provides a method for processing a plurality of analog signals obtained from, for example, a plurality of distributed signal generation points at a signal input processing point separated (about 1 km) from the plurality of signal generation points. The present invention relates to a signal input processing device that selectively inputs and processes the plurality of analog signals at the signal input processing point.

BACKGROUND TECHNOLOGY A conventional signal input processing device of this type connects a number of analog signal transmission lines corresponding to the number of analog signals obtained at a plurality of signal generation points between a plurality of signal generation points and a signal input processing point. Wire each,
Multiple analog signals obtained at multiple signal generation points are individually transmitted to the signal input processing point via analog signal lines, and multiple analog signals (sensor output, etc.) are selectively input at the signal input processing point. It was configured to perform processing (A/D conversion, data collection, etc.).

Another signal input processing device installs A/D converters of the number corresponding to the number of analog signals obtained here at a plurality of signal generation points, and converts each analog signal to the A/D converter. It is configured to convert into digital values, transmit each digital value to a signal input processing point through a time division multiplex signal transmission line using a time division multiplex transmission method, and capture the transmitted data at the signal input processing point. Ta.

Problems to be Solved by the Invention Among the above-mentioned signal input processing devices, the former requires wiring from the signal generation point to the signal input processing point for the number of analog signals, resulting in extremely high wiring construction costs. There was a problem.

On the other hand, since the latter signal input processing device sends data by time division multiplex transmission, it is only necessary to wire a pair of time division multiplex signal transmission lines between the signal generation point and the signal input processing point. At each point, the same number of A/D converters as the number of analog signals is required, which poses a problem of complicating the configuration and increasing equipment cost.

Additionally, when installing an A/D converter at a signal generation point, it is necessary to A/D convert one analog signal with a resolution of 8 to 12 bits for accuracy, and multiplexing this requires an enormous amount of information. Therefore, there is a problem that the transmission speed per analog signal becomes slow.

SUMMARY OF THE INVENTION An object of the present invention is to provide a signal input processing device that can reduce wiring costs, reduce equipment costs, and increase signal transmission speed.

Means for Solving the Problems The signal input processing device of the present invention is a signal input processing device that selectively inputs and processes a plurality of analog signals obtained at a signal generation point at a signal input processing point separated from the signal generation point. an analog signal input processing section, a selection signal generator that generates a selection signal that selectively selects the plurality of analog signals, and a selection signal output from the selection signal generator that converts the selection signal into a time division multiplexed signal. a digital multiplexed signal transmitter installed at the signal input processing point, and a digital multiplexed signal receiver that receives the time division multiplexed signal transmitted from the digital multiplexed signal transmitter and reproduces and outputs the selected signal; A signal selector that selects any one of the plurality of analog signals according to a selection signal output from the digital multiplex signal receiver is installed at the signal generation point, and the digital multiplex signal transmitter and the digital multiplex signal selector are installed at the signal generation point. The present invention is characterized in that the signal receiver is connected with a selection signal transmission line, and the signal selector and the analog signal input processing section are connected with an analog signal transmission line.

Effect: The signal input processing device of the present invention includes an analog signal input processing section, a selection signal generator, and a digital multiplex signal transmitter installed at a signal input processing point, and a digital multiplex signal receiver and a signal selection at the signal generation point. The signal input processing point was When a selection signal is generated by the selection signal generator, this selection signal is converted into a time division multiplexed signal by the digital multiplex signal transmitter and transmitted to the digital multiplex signal receiver through the selection signal transmission line, As a result, the digital multiplex signal receiver regenerates the selection signal, and the signal selector selects an analog signal corresponding to the selection signal and sends it to the analog signal input processing section through the analog signal transmission line. As a result, the analog signal input processing section performs input data input processing (A/D conversion, etc.).

If the selection signal generated from the selection signal generator is sequentially changed, a plurality of analog signals will be sequentially selected at the signal generation point and input to the analog signal input processing section.

In this way, the selection signal is time-division multiplexed transmitted from the signal input processing point to the signal generation point via the selection signal transmission line, and a plurality of analog signal transmission lines are selected at the signal generation point based on the transmitted selection signal. Since the selected analog signal is directly transmitted to the signal input processing point via the analog signal transmission line, it is possible to obtain a signal at the signal generation point by simply installing two pairs of transmission lines between the signal generation point and the signal input processing point. A plurality of analog signals can be selectively input and processed at a signal input processing point, and as a result, wiring costs can be reduced. Furthermore, since there is no need to install an A/D converter at the signal generation point, equipment costs can be reduced.

Furthermore, since analog signals are sent instead of digital signals from the signal generation point to the signal input processing point, and the selection signal sent from the signal input processing point to the signal generation point is 1 bit for each analog signal. , the signal transmission speed can be increased.

Embodiment An embodiment of the present invention will be described based on FIGS. 1 to 4. This signal input processing device includes a first
As shown in the figure, dispersed signal generation points P ₁ ~ _{P N}
Digital multiplex signal receivers R ₁ to R _N and multiplexers MPX ₁ to MPX _N are respectively arranged at the respective terminals, and one control signal generator CT is installed at a signal input processing point Q which is remote from the signal generation points P ₁ to P _N. , digital multiplex signal transmitters T ₁ to _{T N} (corresponding to digital multiplex signal receivers R ₁ to _{R N} , respectively), and analog signal input processing unit (A/D converter, CPU, memory, etc.) and a PC. It is placed.

and a control signal generator CT, a digital multiplex signal transmitter _T1 ~ _TN , and a digital multiplex signal receiver R1 _~
R _N with selection signal transmission lines (2 lines) L ₁ , and connect the output terminals of multiplexers MPX ₁ to MPX _N and the input terminal of the analog signal input processing unit PC with analog signal transmission lines (2 lines) L ₂ . Connect analog signals 11 to 14, 21 to 24, ..., N1 to N4 to each of the four input terminals of multiplexers MPX ₁ to MPX _N.
I am trying to add each. Further, the digital multiplex signal transmitters T ₁ to _{T N} have analog signals to be transmitted 11 to 14, 21 to 24, ..., N1 to
A selection signal for selecting N4 is applied from a selection signal generator (such as a CPU) SS.

The control signal generator CT generates control signals (reset pulse RS, channel designation pulse CH) as shown in FIG. 2A for controlling time division multiplex transmission. In this case, the waveform in Figure 4A is changed to Figure 4B.
It is modulated as follows and sent to the selected signal transmission line _L1 (modulation frequency is 6.7KHz).

The digital multiplex signal transmitters T ₁ to _TN have channel numbers set for the first to Nth channels, respectively, and each digital multiplex signal transmitter T ₁ to _TN receives a control signal and sends a reset pulse.
Counts the channel specified pulse CH after RS occurs, and starts the start bit SB and data bit immediately after the count value reaches the value of the own channel number.
Each data of DB ₁ to _{DB 4} and parity bit PB is modulated (modulation frequency 14.7 KHz) as shown in FIG. 3 and sent out to the selection signal transmission line L ₁ in time series. As a result, multiplexed transmission signals as shown in FIG. 2B are transmitted on the selection signal transmission line _L1 . The data of the four data bits DB ₁ to _{DB 4} are analog signals 11 to 14, 21 to 24, ..., N1
-N4, and is given as 4-bit parallel data from a selection signal generator (such as a CPU) SS to each of the digital multiplex signal transmitters T1 _{to TN} .

The digital multiplex signal transmitters R ₁ to _RN have channel numbers set to the first to Nth channels, respectively, and the digital multiplex signal receivers R ₁ to _RN have channel numbers set to the first to Nth channels, respectively.
Receive control signals and reset pulses
After the channel designation pulse CH is generated after the RS is generated, immediately after the count value reaches the value of the own channel number, the delayed data bits DB ₁ to _{DB 4} and parity bit PB are taken in through the selection signal transmission line L ₁ . After performing a parity check, data bits _DB1 to _DB4 are output as 4-bit parallel data.

The multiplexers MPX ₁ to MPX _N each receive four signals output from the digital multiplex signal receivers R ₁ to R _N , respectively.
Four contacts S ₁₁ to S ₁₄ , S ₂₁ to S ₂₄ , ..., S _N1 to S _N4 correspond to "1" and "0" of the bit parallel data.
turn on and off. As a result, the contacts S ₁₁ to _{S 14} ,
S ₂₁ to _{S 24} , ..., analog signals 11 to 14, 21 to 2 corresponding to the one that is turned on among S _N1 to _{S N4}
4, . . . , any one of N1 to N4 is input to the analog signal input processing section PC.

For example, when inputting the analog signal 11 at the signal generation point _P1 , data of (1000) is given to the digital multiplex signal transmitter _T1 of the first channel, and the remaining digital multiplex signal transmitters _T2 to _TN are All you have to do is give (0000) data. As a result, the signal sent through the selection signal transmission line _L1 is
Only data bit DB ₁ of the first channel is “1”
, and all remaining data bits are "0". Therefore, the digital multiple signal receiver R ₁
will output data of (1000), and the remaining digital multiplex signal receivers R ₂ to R _N will all output data of (0000), and only contact S ₁₁ of multiplexer MPX ₁ will be on, and the rest are all turned off, and the analog signal 11 is input to the analog signal input processing unit PC through the analog signal transmission line _L2 , where input processing by the A/D converter and the like is performed.

For example, when inputting the analog signal 22 at the signal generation point _P2 , data (0100) is given only to the digital multiplex signal transmitter _T2 of the second channel, and data of (0100) is given to the other digital multiplex signal transmitters _T1 , _T3.
~T All (0000) data should be given to _N. The same applies when inputting other analog signals.

Next, the operation when sequentially inputting and processing, for example, analog signals ₁₁ , ₂₁ , . For the sake of simplicity, the following explanation will be made on the assumption that only one analog signal is input for each channel and that the number of data bits in FIG. 2B is only one bit.

First of all, the digital multiplex signal transmitter _T1 is connected to the third
When data "1" is given as shown in Figure B, this data is sent from the digital multiplex signal transmitter T ₁ to the digital multiplex signal receiver R ₁ as shown in Figure 3C. From the data t ₁ hour (T ₁ → R ₁
(time required for signal transmission to) data of "1" is output with a delay. When the digital multiplex signal receiver R ₁ outputs data "1", the multiplexer MPX ₁ is activated and turns on the contact S ₁₁ after a delay of t ₂ hours. As a result, the analog signal 11 of the first channel is sent to the analog signal input processing unit PC through the analog signal transmission line _L2 .
The analog signal input processing unit PC receives the analog signal 11 sent through the analog signal transmission line _L2 ,
Digital multiplex signal transmitter as shown in Figure 3A
_{(t 1 +
t2} ) After a time delay, the data is sampled, A/D converted, and stored in a memory or the like.

After inputting the analog signal 11 (after the fall of the pulse in FIG. 3A), the data given to the digital multiplex signal transmitter _T1 is set to "0".
Make it. Then, this "0" data is sent to the digital multiplex signal receiver _R1 , and the digital multiplex signal receiver _R1 outputs the "0" data t ₃ hours later than the data in Figure 3B. Become.

Thereafter, data of "1" is given to the digital multiplex signal transmitter _T2 as shown in FIG. 3D. This "1" data is sent to the digital multiplex signal receiver _R2 , and from the digital multiplex signal receiver _R2 , FIG.
As shown in , data "1" is output with a slight delay, which turns on the contact S ₂₁ and sends the analog signal 21 of the second channel to the analog signal input processing unit PC through the analog signal transmission line L ₂ . The analog signal input processing unit PC performs input processing of the analog signal 21.

Similarly, the digital multiplex signal transmitter T ₃
As shown in Figures F and H in Figure 3, data of "1" is given to _N in sequence. As a result, the digital multiplex signal receivers R ₃ to _RN sequentially output data "1", contacts S ₃₁ to S _N1 are sequentially selectively turned on, and analog signals 31 to N1 are sequentially output to the analog signal input processing section.
It will be input to the PC.

In addition, a third digital multiplex signal transmitter T ₁ to T _N
The time intervals for sending data "1" in Figures B, D, and H are times t ₁ , t ₂ , t ₃ and the analog signal input processing unit PC.
It is necessary to determine the time required to input and process one analog signal. Furthermore, the data input order is not limited to the example shown in FIG. 3, and can be arbitrarily determined.

In this way, the signal input processing device of this embodiment time-division multiplex transmits the selection signal from the signal input processing point Q to the signal generation points P ₁ to P _N via the selection signal transmission line L ₁ and transmits the selected signal. Select multiple analog signals at signal generation locations P ₁ to P _N based on the selection signal,
Since the selected analog signal is directly transmitted to the signal input processing point Q via the analog signal transmission line _L2 , the two pairs of transmission lines _L1 and _L2 are connected to the signal generation points _P1 to _PN and the signal input processing point. By simply providing a signal between the point Q and the signal generating point P 1 to P _N , a plurality of analog signals obtained at the signal generation points P ₁ to P N can be selectively input and processed at the signal input processing point Q, and as a result, wiring costs can be reduced. Furthermore, since it is not necessary to install A/D converters at the signal generation points _P1 to _PN , equipment costs can be reduced.

Furthermore, it is not a digital signal that is sent from the signal generation points P ₁ to P _N to the signal input processing point Q, but an analog signal is sent, and there is a selection of sending an analog signal from the signal input processing point Q to the signal generation points P ₁ to P _N. The signal is also 1
Since it is 1 bit for each analog signal,
Signal transmission speed can be increased.

Effects of the Invention According to the signal input processing device of the present invention, a plurality of analog signals obtained at the signal generation point can be transmitted to the signal input processing point by simply providing two pairs of transmission lines between the signal generation point and the signal input processing point. As a result, wiring costs can be reduced. Furthermore, since there is no need to install an A/D converter at the signal generation point, equipment costs can be reduced.

Furthermore, since analog signals are sent instead of digital signals from the signal generation point to the signal input processing point, and the selection signal sent from the signal input processing point to the signal generation point is 1 bit for each analog signal. , the signal transmission speed can be increased.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, FIGS. 2 and 3 are timing diagrams of each part thereof, and FIG. 4 is an explanatory diagram of the modulation method. P ₁ to P _N ...Signal generation point, Q...Signal input processing point, _R1 to R _N ...Digital multiplex signal receiver, MPX ₁
~MPX _N ...Multiplexer (signal selector), PC...
Analog signal input processing section, T ₁ to T _N ...Digital multiplex signal transmitter, SS...Selection signal generator.

Claims (1)

[Scope of Claims] 1. A signal input processing device that selectively inputs and processes a plurality of analog signals obtained at a signal generation point at a signal input processing point separated from the signal generation point, comprising: an analog signal input processing section; , a selection signal generator that generates a selection signal that selectively selects the plurality of analog signals; and a digital multiplex signal transmitter that sends out the selection signal output from the selection signal generator as a time division multiplex signal. a digital multiplex signal receiver that is installed at a signal input processing point and receives the time division multiplex signal sent from the digital multiplex signal transmitter and reproduces and outputs the selection signal; and a selection output from the digital multiplex signal receiver. A signal selector that selects one of the plurality of analog signals according to the signal is installed at the signal generation point, and the digital multiplex signal transmitter and the digital multiplex signal receiver are connected by a selection signal transmission line. and the signal selector and the analog signal input processing section are connected by an analog signal transmission line.