JP2007156847A - Process information input mechanism, and monitoring controller using process information input mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To configure a process information input mechanism capable of inputting a large quantity of processing information with fewer input circuits. <P>SOLUTION: The input mechanism is provided with an input processing part which comprises: a scanning switch for closing, opening, and scanning a plurality of information transmission circuits for process information signals for every circuit successively; a timing control circuit for outputting a scanning signal to the scanning switch; a signal processing part for extracting a process information signal for every process information in synchronization with the scanning signal from the process information serial signal; and a memory for storing the extracted process information signal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a process information input mechanism that inputs process information of each process of a monitoring control device of a plant facility such as a power plant or an industrial plant, and a monitoring control device that uses this process information input mechanism.

A process information input mechanism in a monitoring control device for plant equipment such as an electric power plant or an industrial plant is configured as shown in FIG. The process information generation unit 1 of each process of the plant equipment includes contacts A, B, C... M, and the contacts A, B, C... M receive the detection voltage from the detection voltage application line 2 and the contact signal is Input from the output circuit 3 to the process information input mechanism 5. In the process information input mechanism 5, input circuits 6a, 6b, 6c,... 6m provided for each of the contacts A, B, C. The data that is input to the signal processing unit 7 a of the input processing unit 7 and processed by the signal processing unit 7 a is stored in the memory 8.
As described above, the process information input mechanism 5 of the monitoring control apparatus according to the conventional concept has a configuration in which the input circuit 6 is provided for each process information, and the input circuit 6 is required in proportion to the quantity of the process information generating unit 1. The process information input mechanism 5 is large.

Another example of a conventional process information input mechanism is disclosed in Patent Document 1, for example.
In Patent Document 1, signal lines are arranged in a matrix of rows and columns, and both ends of each switch for outputting process information are connected to either of the rows and columns of signal lines arranged in a matrix. The signal lines in the column are connected to the process information input device, and the process information input device is connected to an input circuit corresponding to the signal line, and is input to the state change detection circuit and the signal processing unit of the input buffer via the input circuit. A process information input device is shown.
Thus, by arranging the signal lines in a matrix and connecting the switches for outputting process information to the rows and columns of the signal lines arranged in a matrix, there is an advantage that the number of signal lines can be reduced.
However, even in this configuration, an input circuit is required for each signal line, and an input circuit is required in proportion to the number of process information generation units. When there are many process information generation units, the process information input mechanism becomes large. .

Japanese Patent No. 2732585

  The process information input mechanism 5 according to the conventional concept shown in FIG. 8 requires one element input circuit 6 for one piece of process information, and in the configuration in which the signal lines of Patent Document 1 are arranged in a matrix. Each signal line requires an input circuit, and in any configuration, there is a problem that the process information input mechanism becomes larger in proportion to the amount of process information.

  The present invention has been made to solve the above-described problems, and the process information input mechanism of the monitoring and control apparatus is configured so that it can be input with a small number of input circuits even when the amount of process information is large. The purpose is to realize downsizing of the monitoring control device.

  The process information input mechanism according to the present invention sequentially inputs a process switch for each connected signal transmission circuit and a scanning switch that sequentially closes, opens and scans a plurality of process information signal transmission circuits for each circuit. And an input circuit for outputting as a process information serial signal arranged in the order of input.

  Scanning multiple signal transmission circuits for process information, fetching process information into the input circuit, and outputting it as a process information serial signal allows multiple process information to be input with a single input circuit. The mechanism becomes smaller, and effects such as a reduction in heat generation, improvement in mounting efficiency, and cost reduction can be obtained.

Embodiment 1 FIG.
FIG. 1 shows a circuit diagram of the process information input mechanism according to the first embodiment of the present invention.
FIG. 1 includes a process information generation unit 10 and a process information input mechanism 20.
The process information generation unit 10 includes contacts A, B, C,... M that generate process information, a detection voltage application line 12 that applies a detection voltage to each contact, and a contact state / non-contact of the contact A signal output line 13 for outputting a state signal is connected. The signal transmission circuit 15 includes a detection voltage application line 12, contacts A, B, C... M, and a signal output line 13.

  The process information input mechanism 20 is provided at a portion connected to the process information generating unit 10 from a common line 29 that applies a detection voltage to a plurality of contacts A, B, C... M of the process information generating unit 10. , B, C,... M, the detection voltage application line 12 connected to each circuit is sequentially closed, opened, and scanned, and the contact information A, B, C,. The output signal line 13 for outputting contact signals is connected at once, the input circuit 22 for outputting the contact signals sequentially input as process information serial signals arranged in the input order, and the timing for outputting the scanning signal S to the scanning switch 24 From the input circuit 22 in synchronization with the significant time of each scanning signal Sa, Sb, Sc... Sm that closes the control circuit 25a and the signal transmission circuit 15 of each contact. A signal processing unit 25b that samples the required number of times from the process information serial signal and sequentially outputs it as the process information signal of contacts A, B, C... M, and stores the process information signal output from the signal processing unit 25b for each process information And an input processing unit 25 including a memory 26.

FIG. 2 is a timing chart expressing the data fetching method of the process information input mechanism 10 of FIG. 1 in time series. Each signal in the timing chart of FIG. 2 indicates the upper state as significant “1” and the lower state as involuntary “0”.
2, <process information> indicates the contact state / non-contact state of the contacts A, B, C ·· M of the process information generation unit 10.
<Scanning signal> is a scanning signal S to be input to the scanning switch 24. Sa is a contact A, Sb is a contact B, Sc is a contact C, and Sm is a contact M that sequentially closes and opens the signal transmission circuit 15. This is a scanning signal. The corresponding signal transmission circuit 15 is closed at the timing of significant “1” of each signal.
The <input circuit output signal> is an output signal of the input circuit 22 that is output from the input circuit 22 as a process information serial signal. When the contact is in a contact state, it is significantly “1”, and when the contact is in a non-contact state, it is “0”. Is a signal. The waveform shown below each output signal is the output waveform of the input circuit 22.
The <scanning signal output time> at the bottom indicates the time of each scanning operation as T1, T2, T3, T4, and T5.
The scanning signal Sa becomes significant-involuntary after the scanning signal Sm in the previous stage is involuntarily “0”, and the scanning signal Sb becomes significant-involuntarily after the scanning signal Sa becomes insignificant, and the scanning signals Sc... Sm, Sa , Sb, Sc... Sm..., And so on. The scanning signal S output from the timing control circuit 25a of the input processing unit 25 performs control such that the preceding scanning signal becomes significant after the previous scanning signal becomes insignificant. Done.

Next, the operation state of FIG. 2 will be described.
If the contact state / non-contact state of each contact point in the process information is the state indicated by <process information input signal>, the timing control circuit 25a of the input processing unit 25 sends the scanning switch 24 to the <scanning signal> column in FIG. The scanning signal S shown is output. In response to the scanning signal S, the input circuit 22 outputs a process information serial signal indicated by <input circuit output signal> from the input circuit 22. That is, the signal transmission circuits 15 of the contacts A, B, C... M corresponding to the scanning signals Sa, Sb, Sc. The contact signals of the contacts of the circuit 15 are sequentially input to the input circuit 22, and the contact signals of the respective contacts are output from the input circuit 22 as process information serial signals arranged in the input order.
For example, at the scanning time T1, since the contact M of the <process information> is “0”, the contact A is “0”, the contact B is “0”, and the contact C is “1”, the input circuit 22 at the scanning time T1 The process information serial signal of the output signal is “0001”.
The output signal of the input circuit 22 at the scanning time T2 is “0111”, “0010” at the scanning time T3, “1000” at the scanning time T4, and “1000” at the scanning time T5.

  The process information serial signal output from the input circuit 22 is input to the signal processing unit 25b of the input processing unit 25. Each time the scanning signal S is scanned, each scanning signal Sa, Sb, Sc. Synchronously, the process information is sampled from the serial signal as many times as necessary, fetched as a process information signal from the corresponding contact, and stored in the memory 26 separately for each process information.

  By configuring as described above and scanning and fetching a plurality of process information, a plurality of process information can be input by a single input circuit 22, thereby reducing the number of circuits. The heat generation amount is reduced by downsizing, and the monitoring and control apparatus using the same improves the mounting efficiency and leads to cost reduction.

The contacts A, B, C... M of the process information generating unit 1 may chatter at the time of contact to generate chattering noise. In addition, induction noise may be picked up by the detection voltage application line 12, the signal output line 13, and the like, and it is necessary to consider that these noises are not erroneously captured as signals.
FIG. 3 is a time chart that represents in time series a method for capturing and determining data in the process information input mechanism 20, and illustrates a case where the contact signal of the contact A of the process information generating unit 10 is captured. The first row shows the contact / separation state of the contact A of the process information input signal. The second stage shows the waveform of the scanning signal Sa for the contact A. The third stage shows the waveform of the input circuit output signal output from the input circuit 22 when the contact signal of the contact A is input to the input circuit 22. The fourth stage shows a state of sampling from the input circuit output signal of the contact A in the input processing unit 25b. The fifth row shows the fetched data of the signal processing unit 25b.

Also, t1 shown in FIG. 3 is the chattering time of the input contact signal, Ts1 is the period of the scanning signal, ts is the time when one scanning signal is significant, t2 is the delay time of the entire input circuit, and t3 is This is a data determination time for determining data by matching the data acquired by sampling N times continuously.
The data determination time t3 is determined on the assumption that the input data is stable.

When the contact point A of the process information generating unit 10 is in a contact state, the contact signal of the contact point A is in an unstable state due to the initial chattering of t1, and the sampling of the signal processing unit 25b is “0” “ “0” “0” is read, and “1”, “1”,... Are read in accordance with the contact signal of the contact A after the time point when chattering disappears. When data that coincides with “1”, “1”... N times (three times in FIG. 3) continuously from the contact signal read by the signal processing unit 25b is read, the data of the contact A is “1”. To confirm.
When the sampling data immediately before the scanning signal Sa changes from significant to insignificant is “1”, “1” is stored in the memory. When the scanning signal Sa becomes involuntary, the sampling of the process information contact A stops. Again, the scanning signal Sa becomes significant after Ts1, but the contact signal at the contact A continues to be significant, and sampling during the rising time t2 of the output waveform from the input circuit 22 is “0” “0” “ “1” is read after “0”, and “1”, “1”, “1”... Are read N times consecutively, and new data of the contact A is “1”. Confirm as Also for the contacts B to M, process information signals are sequentially determined in the same manner by the scanning signal S and stored in the memory 26.
The stored process information signal is updated by storing the determined process information signal every time it is scanned.

  In this way, by sampling the input state at a fixed period during scanning of the contact signal of the process information and determining the data with the data that matches N times in succession, the rise of the process information input signal, etc. Incorrect data can be prevented during the unstable period.

Embodiment 2. FIG.
In the first embodiment, the scanning switch 24 is provided on the common line 19 side for supplying the detection voltage to the contact of the process information generating unit 10. However, in the second embodiment, the scanning switch 34 is connected to the contacts A, B, and C. ... arranged on the input side of the M contact signal.
FIG. 4 is a circuit diagram of the process information input mechanism 30 according to the second embodiment. The process information generation unit 10 is the same as that of the first embodiment, and the process information input mechanism 30 is configured to detect the contact points A, B, and B of the process information generation unit 10 from the common line 29 to which the detection voltage is applied through the detection voltage application line 31. The scanning switch 34 is connected to the input circuit 22 by connecting each contact signal of the signal output line 32 of the process information generating unit 10 to C. The input circuit 22, the input processing unit 25, the timing control circuit 25a, the signal processing unit 25b, and the memory 26 are the same as those in FIG.

In this configuration, the scanning switch 34 is arranged between the contact signal input part of the contacts A, B, C... M and the input circuit 22, so that the detection voltage is supplied from the common line 29 to the process information generating part 10. One detection voltage application line 31 may be supplied, and the number of control lines in this portion is reduced.

  With this configuration, the detection voltage application line 31 for supplying the detection voltage to the process information generation unit 10 is one, and the signal output line 32 is the same as that in the first embodiment, but in FIG. Compared to the configuration, the number of control lines between the process information generation unit 10 and the process information input mechanism 30 can be reduced.

Embodiment 3 FIG.
In the first embodiment and the second embodiment, the contact signal is directly input from the contacts A, B, C... M to the input circuit 22, but the contacts A, B, C. Inductive noise may enter chattering and signal transmission circuits during contact and separation.
In the third embodiment, a process information input mechanism 40 is configured by adding a noise filter 41 for removing noise included in a signal from the process information generation unit 10 to the configuration of FIG. 1 of the first embodiment.
FIG. 5 is a circuit diagram of the process information input mechanism 40 according to the third embodiment. In this configuration, the process information generation unit 10, the common line 29, the detection voltage application line 12, the signal output line 13, the input circuit 22, the input processing unit 25, and the timing control circuit 25a other than the noise filter 41 that removes noise are added. The signal processing unit 25b, the memory 26, and the scanning switch 24 are the same as those in FIG.

  When the noise filter circuit 41 is provided in the contact signal input unit of the process information input mechanism 40 as described above, induction noise and contact chattering noise are reduced, and noise can be prevented from being taken in as a signal.

  In the configuration of FIG. 4 according to the second embodiment, the same effect can be obtained by disposing the noise filter 41 between the scanning switch 34 and the input circuit 22.

Embodiment 4 FIG.
In the first to third embodiments, each signal transmission circuit at the contact point of the process information generating unit is sequentially connected to output a scanning signal for scanning to the scanning switch, and each input circuit output signal from the input circuit is scanned for each scanning. Although the input control unit is provided with a timing control function for sampling in synchronization with the significant time of the signal, the fourth embodiment has a configuration in which a timing control circuit is provided separately from the input processing unit.

  FIG. 6 is a circuit diagram of the process information input mechanism according to the fourth embodiment. In the configuration of FIG. 6, a timing control circuit 53 is provided between the input circuit 22 and the input processing unit 55 of the process information input circuit 50. The difference from FIG. The input processing unit 55 is provided with a timing control circuit 53, and the input processing unit 55 includes a signal processing unit 55b and a memory 26. Other detection voltage application line 12, signal output line 13, input circuit 22, scanning switch 24, and memory 26 are the same as those in FIG.

  When the timing control circuit 53 is separated from the input processing unit in this way, the configuration of the input processing unit 55 is simplified, and the timing control circuit 53 can be easily configured according to the process information amount of the monitoring control device. Thus, the effect of increasing the degree of freedom of design is obtained.

Embodiment 5. FIG.
In the first to fourth embodiments, the scanning signal of the process information input mechanism is output for each circuit of the process information. However, when the amount of process information is large, the scanning signal is output for each circuit. In a configuration in which process information is obtained by a single input circuit, the period for scanning each process information becomes longer, and the time lag of the captured process information becomes larger than the actual process information. For this reason, process information cannot be taken in correctly, the data fetching accuracy of the process information input mechanism is lowered, and the monitoring control apparatus using this has a problem that the monitoring control accuracy is lowered.
In the fifth embodiment, even when the amount of process information is large, a process information input mechanism that can keep the time lag between the actual process information and the captured process information within a practically acceptable range is provided with a small number of input circuits. The purpose is to configure.

FIG. 7 is a circuit diagram of the process information input mechanism according to the fifth embodiment.
The process information generating unit 60 having this configuration is configured to divide the contact points of the target process information into m groups having n contacts per group, and to capture contact signals of n contacts in one group. .

The process information generating unit 60 divided into n m groups per group, the A group 61 is the contacts A1, A2... An, the B group 62 is the contacts B1, B2... Bn,. The contacts M1, M2,.
The process information generator 60 and the process information input mechanism 70 are connected by a detection voltage application line 66 for each group so that the detection voltage can be switched and applied for each group. The group 60 of the unit 60 is connected to the process information input mechanism 70 through a signal output line 67 from each of the groups A, 61, 62,. A signal transmission circuit 68 is constituted by the detection voltage application line 66, the contacts A1, A2... An, B1, B2,... Bn,.

The process information input mechanism 70 is connected to a common line 79 that applies a detection voltage to each contact of the process information generation unit 60, and each contact of the process information generation unit 60 is sequentially connected for each group to apply a detection voltage. A switch 74 is provided, and a signal output line 67 from each contact of the process information generating unit 60 collectively connects the output side of the contacts in the same arrangement order of each group, and the noise filter circuit 71 (71a, 71b for each same arrangement order). 71m), an input circuit 72 (72a, 72b,... 72m), and a timing control circuit 73 are connected and connected to the input processing unit 75 by a bus 77. The input processing unit 75 includes a signal processing unit 75 b and a memory 76. As shown in an enlarged manner, the memory 76 includes a memory 76 that stores process information divided into groups.
The timing control circuit 73 sequentially closes and opens the signal transmission circuit 68 of each contact of the process information generation unit 60 for each group, outputs the scanning signal S to the scanning switch 74, and determines whether each scanning signal S is significant. The timing control for taking in the contact signal and outputting it to the input processing unit 75 is performed in synchronization with this time.

In the process information fetching operation in FIG. 7, the process information is fetched in the order of closure of the process information transmission circuit 68 scanned and closed by the scanning signal S from the timing control circuit 73 in the arrangement order of each group. Noise is reduced by the noise filter 71 for each rank and input to the input circuit 72, output as a process information serial signal for each array from the input circuit 72, transmitted through the bus 77, and distinguished for each array to the input processing unit 75. input.
In the input processing unit 75, the signal processing unit 75b determines the process information signal by sampling from the input process information serial signal for each array by the method described in FIG. Information signals are stored in the memory 76 separately for each array of process information.

  When process information is input from a large number of process information generation units, the process information generation unit is divided into m groups of every n pieces, and data is acquired by performing m scans with n input circuits. When a large amount of process information data can be captured without increasing the scanning time interval, the time lag between the actual process information and the captured process information is reduced, and there are many process information generation units. In addition, a highly accurate process information input mechanism can be configured, and when this process information input mechanism is used, a small-sized monitoring control apparatus with high monitoring accuracy can be configured.

FIG. 2 is a circuit diagram of a process information input mechanism according to the first embodiment. It is the timing chart which expressed the data acquisition method of the process information input mechanism in time series. 4 is a time chart that represents a method for capturing and determining data in a time series in a process information input mechanism. FIG. 10 is a circuit diagram of a process information input mechanism according to the second embodiment. FIG. 10 is a circuit diagram of a process information input mechanism according to the third embodiment. FIG. 10 is a circuit diagram of a process information input mechanism according to a fourth embodiment. FIG. 10 is a circuit diagram of a process information input mechanism according to a fifth embodiment. It is a circuit diagram of the process information input mechanism comprised by the conventional concept.

Explanation of symbols

10 process information generator, 12 detection voltage application line, 13 signal output line,
15 signal transmission circuit, 20 process information input mechanism, 22 input circuit,
24 scanning switch, 25 input processing unit, 25a timing control circuit,
25b signal processing unit, 26 memory, 29 common line, 30 process information input mechanism,
31 detection voltage application line, 32 signal output line, 34 scanning switch,
40 process information input mechanism, 41 noise filter, 50 process information input mechanism,
53 timing control circuit, 55 input processing unit, 55b signal processing unit,
60 process information generation part, 61 group A, 62 group B, 6m group M,
66 detection voltage application line, 67 signal output line, 68 signal transmission circuit,
70 process information input mechanism, 71 noise filter, 72 input circuit,
73 timing control circuit, 75 input processing unit, 75b signal processing unit, 76 memory,
77 bus, 79 common lines.

Claims (9)

A scanning switch that sequentially closes, opens and scans a plurality of process information signal transmission circuits for each circuit, and sequentially inputs the process information for each connected signal transmission circuit, and processes information serials arranged in the order of input. A process information input mechanism comprising: an input circuit that outputs a signal. A timing control circuit that outputs a scanning signal to the scanning switch; a signal processing unit that extracts a process information signal for each process information in synchronization with the scanning signal from the process information serial signal; and the extracted process information 2. The process information input mechanism according to claim 1, further comprising an input processing unit comprising a memory for storing signals. 3. The process information input mechanism according to claim 1, wherein the scanning switch is arranged on a detection voltage application side of the signal transmission circuit for the plurality of process information. 3. The process information input mechanism according to claim 1, wherein the scanning switch is arranged between the signal transmission circuit for the plurality of process information and the input circuit. The process information input mechanism according to claim 1, wherein the timing control circuit is provided independently of the input processing unit. A large number of process information generation units and signal transmission circuits for transmitting process information signals of the respective process information generation units are divided into a plurality of groups, and the process information generation unit and the signal transmission circuit for each divided group are grouped. The scanning switches that are sequentially closed, opened, and scanned, and the output sides of the same arrangement order of the signal transmission circuits of the plurality of groups are connected together, connected to the parts connected together, and divided as described above. A plurality of input circuits that sequentially input the process information having the same arrangement order of each group and output the process information serial signals arranged in the input order for each same array, and a timing control circuit that outputs a scanning signal to the scanning switch , Process for each process information from the above process information serial signal Signal processing unit for extracting an information signal, the extracted process information input mechanism, characterized in that an input processing unit comprising a memory for storing the process information signals. The process information input mechanism according to claim 1, wherein a noise filter for removing a noise component is provided on an input side of the process information of the input circuit. The extraction of the process information signal performed in synchronization with the scanning signal from the process information serial signal output from the input circuit determines the data when the sampling data coincides with a predetermined number of times continuously. A process information input mechanism according to any one of claims 2 to 7. A monitoring and control apparatus, wherein at least one process information input mechanism according to any one of claims 1 to 8 is used in a process information input section.

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