JPH08320702A - Data selecting method for double input board - Google Patents

Abstract

PURPOSE: To increase a selecting speed for data by selecting data from both input systems of an in-operation and a stand-by system through simple logical operation instead of switching the redundant input parts which are made redundant between the in-operation and stand-by system. CONSTITUTION: A controller is equipped with a control arithmetic part 2 which performs control arithmetic processing and an input part 3 equipped with two sets of one or plural input boards (4A and 4B) and (5A and 5B) which receive signals from external detection parts 4 and 5 and send and receive data to and from the control arithmetic part 2, and the control arithmetic part 2 is equipped with a selecting means for doubled input data which performs selective operation 2C for larger data by performing AND operation 2R between digital data D1 and D2 and comparing analog data At and A2 with each other among data sent from the doubled boards (4A and 4B) and (5A and 5B), and clears the data of an abnormal input board or sets the data to a miminum value (analog data) if the input board becomes abnormal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data input method for a dual input board of a control device having two sets of the same input boards and having redundant input signal reception systems.

[0002]

2. Description of the Related Art In order to improve the reliability and operating rate of a control device, an important control system is subjected to a duplexing process of the control device as needed. FIG. 4 shows a dual structure of the input / output unit of the control device, which is disclosed by the present inventor in Japanese Patent Laid-Open No. 2-189639 "Duplicate switching device of control system". In FIG. 4, the control system of the control system receives the input signal detected by the detection unit 4 from the controlled object in a redundant redundant manner at the input units 3A and 3B, and performs a predetermined calculation at the calculation unit 2. Output the output section 6
Control is performed by operating the operation unit 7 via A and 6B. In this control system, the input / output parts 3A, 3B, 6A, 6B are duplicated,
One of the input / output units operates as an operating system (input / output units 3A and 6A in the illustrated example), and the other operates as a standby system (input / output units 3B and 6B). Hereinafter, the operation system will be mainly described, and the functional members of the standby system will be indicated by the member numbers in parentheses.

The input section 3A (3B) shows an analog input case in the example shown in FIG. 4, and the input signals detected by the detection sections 41 to 4n are sampled by the multiplexer MPX 42a (42b), and A Converted to a digital value with the / D converter 41a (41b),
This digital value is then used by the parallel / serial converter P / S.
The data is converted into serial data at 31 (32), and the input signal on the operating system side is stored in the input buffer 81 by the switching unit 8 of the arithmetic unit 2. The data stored in the input buffer 81 is stored in advance in the calculation unit 2
Predetermined control arithmetic processing is performed in accordance with the procedure of the program installed in, and the arithmetic output is stored in the output buffer 82.

The output unit 6A (6B) converts the data stored in the output buffer 82 into parallel data by the serial / parallel converter S / P 61 (62), and the analog data by the D / A converter 71a (71b). Convert to a value and select the output signal on the operating system side with the switching unit 9A (9B),
The multiplexer MPX 72a (72b) distributes the data to output channels, and a sample and hold circuit (not shown) outputs analog data to the operation units 71 to 7m.

The switching of the input / output units 3A, 3B, 6A, 6B to the operating system and the standby system is performed by the switching unit 8 and the switching units 9A, 9B. When an abnormality occurs in the operating system input unit 3A, the abnormality is detected using an abnormality detecting means for input data (not shown) provided in the arithmetic unit 2, and the operating system input unit 3A in which the abnormality occurs is provided in the arithmetic unit 2. The switching unit 8 is switched to the standby system input unit 3B. Further, when an abnormality occurs in the output unit 6A, the abnormality is detected by using an abnormality detection means for output data (not shown) provided in the operating system output unit 6A, and the operating system output unit in which the abnormality occurs
6A is switched to the standby system output section 6B by switching sections 9A and 9B provided in the output sections 6A and 6B. With this configuration, by switching between the switching unit 8 and the switching units 9A and 9B, the A / D converter 41b and the parallel / serial converter P / of the standby input unit 3B are switched.
It is possible to almost eliminate the influence of the delay due to S 32 or the delay due to the serial / parallel converter S / P 62 and the D / A converter 71b of the output section 6B of the standby system.

[0006]

As described above, according to the method of the prior art, the input section forming the redundant system is switched to the active system and the standby system by the switching section, and this switching is performed by the input section of the operating system. Since the input data is selected and used by determining whether the operation is normal / abnormal, there is a problem that it takes time to select the data. In particular, when the operating system input unit itself determines an abnormal operation of the operating system input unit, it is necessary to notify the arithmetic unit 2 of the switching command between the operating system and the standby system by using transmission means, and only the transmission time is switched. There is a problem that the operation is delayed.

The present invention has been made in view of the above points, and an object thereof is to solve the above-mentioned problems and to switch the input section constituting a redundant system to an active system and a standby system separately. The purpose of the present invention is to provide a data selection method for a dual input board that speeds up the data selection speed by performing a logical sum operation or comparison of the data corresponding to the duplication from both input sections and selecting the larger data to perform the control operation processing. .

[0008]

In order to achieve the above object, in the present invention, a control arithmetic unit having a control arithmetic board for performing control arithmetic processing, and a control arithmetic unit for receiving a signal from an external detection unit are provided. In a data selection method for a redundant input board of a control device, comprising: an input unit comprising two sets of one or more input boards for transmitting and receiving data, and a redundant input board configuration, a control arithmetic board or a transmission board. One of the two boards selects the redundant input data from the digital data transmitted from the redundant input board and performs the logical sum operation between the digital data corresponding to the redundant operation and uses this logical sum data as the operation input data of the control operation board. A means is provided for clearing the data of the abnormal input board when an error occurs in one of the dual input boards. To.

Further, a control arithmetic unit having a control arithmetic board for performing control arithmetic processing and two sets of one or more input boards for receiving signals from an external detection unit and exchanging data with the control arithmetic unit are provided. In the data selection method of the redundant input board of the control device, which comprises the input unit and the redundant input board, one of the control arithmetic board and the transmission board is the analog data transmitted from the redundant input board. Of the dual input boards, one of the two input boards is equipped with a dual input data selection means that compares the analog data corresponding to the duplex and selects the larger analog data and uses this data as the operation input data of the control operation board. When an abnormality occurs in the above, the data of the relevant abnormality input board shall be set to the minimum value.

Further, the control arithmetic unit includes a control arithmetic board,
A transmission board connected to this control arithmetic board is provided, and the transmission board is provided with means for selecting duplicated input data.

[0011]

With the above structure, the digital data transmitted from the duplicated input board is subjected to the logical sum (OR) operation between the duplicated corresponding digital data, and this logical sum data is used as the arithmetic input data of the control arithmetic board. It is not necessary to switch the input section constituting the redundant system to the operating system and the standby system, and it is possible to immediately select the input digital data. In particular, when an error occurs in one of the redundant input boards, the normal side input data can be selected and supplied to the control operation unit by clearing the data of the abnormal input board.

Of the analog data transmitted from the redundant input board, the analog data corresponding to the redundant operation is compared, the larger analog data is selected, and this data is used as the operation input data of the control operation board, whereby redundancy is achieved. It is no longer necessary to switch the input section forming the system into the active system and the standby system, and it is possible to immediately select the input analog data. Especially, when an error occurs in one of the redundant input boards, the input data on the normal side can always be selected and supplied to the control operation unit by setting the data of the abnormal input board to the minimum value. it can.

When the control arithmetic unit is provided with a transmission board, the transmission board is provided with means for selecting duplicated input data, so that the load on the CPU of the control arithmetic board can be reduced and the input data of the transmission board can be reduced. The selection processing time can also be shortened. Here, the control arithmetic board, the transmission board, or the input board has a CPU to detect its own internal abnormality. For self-diagnosis of hardware, input disconnection check, parity check, watchdog timer check, memory sum So-called RA such as check or read / write check
The S function is checked, and the abnormality check between the control operation board, the transmission board, and the input board is carried out during the fixed period because the data between these functional members are communicated at a fixed cycle. Abnormality can be detected by determining that there is no access.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a control device for explaining a data selection method of a duplex input board according to an embodiment of the present invention, FIG. 2 is a logic diagram for explaining a duplicate input data selecting means, and FIG. 3 is input data. 3 is a time chart for explaining a selection state of. The control device has various configurations depending on the number of input / output points, control monitoring purpose, processing capacity, etc., but here, for simplification, a predetermined control is provided according to the procedure of a program loaded with a CPU and a memory function. A control arithmetic board that performs arithmetic processing, and a transmission board that gives the scale of the control device, the number of input / output points, or the flexibility of the control device,
Consider the relationship between an input board having two sets of one or a plurality of input boards in a redundant configuration. (1) In a small-scale controller with relatively few input / output points,
Some input boards have a CPU function and some do not. (2) In a control device with a relatively large number of input / output points and a medium scale or more, a transmission board is usually provided, and a control calculation section having a control board and a transmission board and an input section composed of a plurality of input boards are separately configured.

When the transmission board is provided, the duplication input data selection means is often executed by the transmission board according to the procedure of the processing program of the transmission board for the reason to be described later, and when the transmission board is not provided, it is controlled. It is executed according to the procedure of the processing program of the arithmetic board. Also, when the input board has a CPU function, the input board itself detects abnormalities in the input board, and when the input board is a digital input signal, the output data of the abnormal input board is cleared and the input board analog input. If it is a signal, set the output data of the abnormal input board to the minimum value. Also, when the input board does not have a CPU function,
The abnormalities of the input board are detected by the transmission board or the control arithmetic board. When the input board is a digital input signal, the L level data is read from the abnormal input board to the redundant input data selection means. When the input board is an analog input signal, the reading of the input data to the duplication input data selecting means is performed by reading the predetermined minimum value data,
Clear the input data or set to the minimum value.

Therefore, the configuration of FIG. 1, which has the largest system scale as a control device, will be mainly described below. When the transmission board is not provided or when the input board is not provided with a CPU function, the corresponding portion will be described. Should be read instead. In FIG. 1, the control device 1 includes a control arithmetic unit 2 including a control arithmetic board 11 that performs control arithmetic processing, a transmission board 21, and a transmission board 31 connected to the transmission board 21 via a transmission path 33. An input section 3 comprising two sets (4A, 5A ...), (4B, 5B ...) of one or more input boards for receiving analog signals or digital signals from external detection sections 4, 5. It is equipped with. In the illustrated example, the analog signal from the detector 4 is connected to the input boards 4A and 4B, and the digital signal from the detector 5 is input boards 5A and 5B.
The input signal system is redundantly configured. Further, when a redundant configuration including the transmission path 33 is performed, a transmission board 32 shown by a dotted line is added to the input unit 3, and the transmission board 21 and the transmission board 32 are connected by the transmission path 34 to provide a redundant configuration. be able to.

The operation will be described with reference to FIGS. In the above-mentioned configuration, the transmission board 21 of the control calculation unit is provided with the duplicated input data selecting means, and the duplicated input board 5 is provided.
Of the digital data transmitted from A and 5B, (B) in Fig. 2
As shown in, duplicated digital data
The logical sum operation 2R between D1 and D2 is performed, and this logical sum data is input to the control arithmetic board 11 as selection data. In such a configuration, the input boards 5A and 5B have the CPU function and the abnormality detection function of their own input boards. Of FIG.
In (B), when one of the redundant input boards 5A and 5B has an abnormality, the abnormality detection function of the input board 5B detects the abnormality and the data of the abnormal input board is set to L level. To clear. Selective outputs are both input boards
Since it is an OR operation of 5A and 5B, the digital data D1 is selected and normal data can be input to the control operation board 11. As a result, as shown in the digital input data selection time chart of FIG. 3 (B), even if one input board fails, the other input board can be input and the normal control arithmetic processing can be performed. You can continue. Here, the function of the OR operation 2R is
Any one of the transmission board 31, the transmission board 21, and the arithmetic board 11 may have the function.

The analog data A1 and A2 transmitted from the duplicated input boards 4A and 4B are compared with the analog data A1 and A2 corresponding to the duplicated data by the comparison operation 2C as shown in FIG. By comparison, the larger analog data is selected, and this data is used as the input data of the control arithmetic board 11. In such a configuration, as shown in FIG. 3 (A), when one of the redundant input boards 4A and 4B has an abnormality, the abnormality detection function of the input board 4B has an abnormality. Detect and set the data of the abnormal input board to the minimum value. Since the selected output selects the larger analog data of both input boards 4A and 4B, analog data A1
Is selected, and normal data can be input to the control arithmetic board 11. As a result, as shown in the (A) analog input data selection time chart of FIG. 3, even if one input board fails, the other input board can still input, and normal control calculation processing continues. You can continue. The function of the comparison calculation 2C is the transmission board 3
1, any of the transmission board 21 and the arithmetic board 11 may have the function.

The duplicated input data selecting means in the transmission board 21 temporarily stores, for example, the input data A1 (D1) transmitted from the input board 4A (5A) in the buffer memory and then transmits it from the input board 4B (5B). The input data A2 (D2) to be input and the input data A1 (D1) previously stored in the buffer memory are selectively operated by the logical operation 2C or 2R, and the selected data is input previously assigned to the control operation unit 2. The selected data is stored in the memory area of the control operation board
Can be handed over to 11. In addition, the input data selection means by the control arithmetic board 11 is such that both input boards 4A, 4B, (5A, 5
The input data A1, A2, (D1, D2) transmitted from (B) is temporarily stored in the buffer memory, and then the control operation board 11 calls these data and performs a selective operation with the logical operation 2C or 2R to obtain the data. Make a selection. Therefore, the redundant input data selection by the transmission board 21 can shorten the input data selection time and the load on the control calculation board 11 as compared with the input data selection means by the control calculation board 11.

In the data selection method of the dual input board according to the present invention, the abnormality of the input board of the operating system according to the prior art is detected and compared with the number of program steps for switching this, the logical sum operation and the analog input are performed in the case of the digital input signal. In the case of a signal, only the arithmetic processing that compares and outputs the larger data is needed, and the load of the program processing in the steady state is small. Further, as compared with the prior art, it is not necessary to detect an abnormality and transmit the abnormality to switch it, so that the switching time at the time of abnormality can be shortened.

[0021]

As described above, according to the present invention, the data selection of the dual input board can be performed only by a simple logical operation. As a result, in the conventional technology, the input unit that constitutes the redundant system is divided into the active system and the standby system, and in comparison with the method of judging the input board failure and switching from the active system input board to the standby system input board, It is possible to reduce the regular program processing and to shorten the switching time in the event of an abnormality.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a control device for explaining a data selection method of a dual input board according to an embodiment of the present invention.

FIG. 2 is a logical diagram illustrating a means for selecting duplicated input data.

FIG. 3 is a time chart explaining a selection state of input data.

FIG. 4 is a diagram showing a control device of a conventional example.

[Explanation of symbols]

 1 control device 11 control operation board 2 control operation unit 21, 31 transmission board 2C comparison operation 2R logical OR operation 3 input unit 33 transmission path 3A, 3B, 6A, 6B input / output unit 4A, 4B, 5A, 5B input board 4, 41 to 4n, 5, detection unit 71 to 7m Operation unit 8, 9A, 9B switching unit 81, 82 Buffer A1, A2 analog signal D1, D2 digital signal

Claims (3)

[Claims] 1. A control arithmetic unit having a control arithmetic board for performing control arithmetic processing, and two sets of one or more input boards for receiving signals from an external detector and exchanging data with the control arithmetic unit. In the method of selecting data for a redundant input board of a control device having a redundant input board, the control operation board or the transmission board is a board for digital data transmitted from the redundant input board. Of the redundant input boards, one of the two input boards has an error.The logical OR operation is performed between the digital data corresponding to the redundant operation and the logical OR data is used as the operation input data of the control operation board. When the error occurs, the data of the abnormal input board is cleared, and the data selection method of the redundant input board. 2. A control arithmetic unit having a control arithmetic board for performing control arithmetic processing, and two sets of one or more input boards for receiving signals from an external detector and exchanging data with the control arithmetic unit. In the method of selecting data for a redundant input board of a control device having a redundant input board, the control computation board or the transmission board is a board for analog data transmitted from the redundant input board. Among them, the analog data corresponding to the duplex is compared, the larger analog data is selected, and this data is used as the computation input data of the control computation board. When a board error occurs, the data of the error input board is set to the minimum value. Data selection method. 3. The data selection method for a duplicated input board according to claim 1 or 2, wherein the control operation section includes a control operation board and a transmission board connected to the control operation board. A method for selecting data for a duplicated input board, characterized in that the transmission board is provided with a means for selecting input data.