JPH02189639A - Duplication switching device for control system - Google Patents

Abstract

PURPOSE:To prevent a data flow from being lacked or delayed by allowing a switching part included in an operation part to switch a driving system input part to a waiting system input device at the time of occurrence of abnormality in the driving system input part, and at the time of occurrence of abnormality in a driving system output part, allowing a switching part included in an output part to switch the driving system output part to a waiting system output part. CONSTITUTION:When abnormality is caused in the driving system input part 5, the abnormality is detected by an input data abnormality detecting means included in the operation part 1 and the driving system input part 5 causing the abnormality is switched to the waiting system input part 6 by the switching part 11 included in the operation part 1. When abnormality is caused in the driving system output part 2, the abnormality is detected by using an output data abnormality detecting means included in the output part 2 and the driving system output part 2 causing the abnormality is switched to the waiting system output part 3 by the switching parts 21, 31 included in the output parts 2, 3. Thus, a time delay due to switching is scarecely caused.

Description

[Detailed description of the invention] [Industrial application field]

The present invention provides two input sections for control target equipment, an operating system, and a standby system that are controlled by inputting a plurality of operation signals while outputting a plurality of detection signals. an input unit that sequentially executes a process of inputting a signal and converting it into the same serial digital input signal for each of the detection signals; a serial unit that performs predetermined arithmetic processing on the digital input signal to control the controlled device; a calculation unit that outputs a digital output signal; two output units, an active system and a standby system, each inputting at least the same digital output signal and converting it into the same operation signal; This invention relates to a redundancy switching device for switching the input part or output part from the active system to the standby system in a standby redundant type redundant control system equipped with an output part that is executed sequentially, and in particular, the processing switching time during the switching. The present invention relates to a duplex switching device that can be made as small as possible.In the following figures, the same reference numerals indicate the same or equivalent parts.

[Conventional technology]

FIGS. 2 and 3 are block circuit diagrams for explaining this type of conventional duplex switching system. In FIG. 2, (■) performs a predetermined calculation based on analog input data 7A from the controlled device 10, and digital output data 8 is used to control the controlled device 10.
The arithmetic unit that obtains B is equipped with a CPU (not shown). The input data 7A is analog data indicating the operating status of the controlled device, and is input to the plurality of detection units 7 (71 to 7n) of the controlled device 10.
are output respectively. Reference numerals 5 and 6 designate input units having the same configuration and including a CPU (not shown), each of which is a multiplexer (also abbreviated as MPX) 5 that switches analog input data 7A from a plurality of detection units 7 in synchronization with each other. 'C, 6G, and then A/D converter 5b, 6b.
Further, the A/D converted parallel digital data is converted into serial digital data 98 via parallel/serial converters 5a and 6a, and is transmitted to the arithmetic unit 1. These 5 and 6 constitute two systems: an active system and a standby system. In this example, it is assumed that one of 5 and 6 is used as an active system input section, and the other 6 is used as a standby system input section. 2 and 3 are output units having the same configuration and equipped with a CPU (not shown), each of which sequentially converts the serial to digital output data 8B of the calculation unit 1 into parallel digital data via serial/parallel converters 2a and 3a. After the conversion, this converted data is D/A converted via the D/A converters 2b and 3b, and the converted analog data is sent to the controlled device 10 via a multiplexer (MAX) that performs switching operations in synchronization with each other. The information is sequentially switched and transmitted to the plurality of operating units 4 (41 to 4n). Similarly to the input section described above, 2 and 3 constitute two systems, an active system and a standby system, and in this example, one 2 is used as the active system output section, and the other 3 is used as the standby system output section. shall be used. Reference numeral 12 denotes a switching unit between an active system and a standby system, which is provided in the calculation unit 1 and is capable of switching between an input unit and an output unit. When an abnormality occurs in the input section 5 or the output section 2 of the operating system, the abnormality is detected through an abnormality detection means for input data or output data (not shown) provided in the calculation section 1, and The switching unit 12 switches from the input unit 5 or output unit 2 of the active system where the abnormality has occurred to the input unit 6 or output unit 3 of the standby system. The only difference between the following Fig. 3 and Fig. 2 is that the switching section for switching between the active system and the standby system is provided on the input section and output section, respectively, on the side closer to the controlled device 10. , the active system input section 5 is provided with a switching section 51, the standby system input section 6 is provided with a switching section 61, the active system output section 2 is provided with a switching section 21, and the standby system output section 3 is provided with a switching section 31. ing. If an abnormality occurs in the input section 5 or output section 2 of the operating system, the abnormality is detected using an input data or output data abnormality detection means (not shown) provided in these input sections or output sections, and the abnormality is detected. The input section 5 or output section 2 of the generated operating system is switched to the switching sections 51.61 and 21.3 provided in these input sections 5, 6 and output section 2.3.
1 to switch to the standby input section 6 or output section 3.

[Problems to be Solved by the Invention] However, the above-mentioned method has the following problems. First, in the method shown in FIG. 2, there is an abnormality in the active output section 2, and when switching to the standby output section 3 by the switching section 12 in the calculation section 1 as described above, the output section of the standby system output section 3 from the calculation section 1 Since there is a time delay based on the processing of the serial/parallel converter 3a, D/A converter 3b, etc., an abnormality occurs and the output data 8B is not sent to the operation unit 4 after the switching of the switching unit 12 is completed. It takes a certain period of time for the data to flow, and during that period, output data is missing. On the other hand, in the method shown in FIG. 3, there is an abnormality in the operating system input section 5.
When switching to the standby system input section 6, in this method, the input section 5
, 6, but the standby system input section 6
Because there is a time delay between the input terminal of the A/D converter 6b, parallel/serial converter 6a, etc. due to the processing of the A/D converter 6b, parallel/serial converter 6a, etc., the input to the calculation unit 1 will occur after an abnormality occurs and the switching is completed. A certain period is required for the data 78 to flow, and input data is missing during that period. Therefore, the problem of the present invention is to prevent data loss caused by time delays caused by various conversion processes between the input section and the calculation section or between the calculation section and the output section when switching from the active system to the standby system. An object of the present invention is to provide a redundant switching device for a control system that eliminates the problem.

[Means to solve the problem]

In order to solve the above-mentioned problems, the double switching device of the present invention outputs a plurality of detection signals (input data 78, etc.) (outputted from the detection section 7, etc.) and also outputs a plurality of operation signals. (4A, etc.) to control target equipment (10, etc.), an active system, and a standby system, each of which receives at least the same detection signal and receives the same serial digital input. An input unit (5,
6, etc.), a calculation unit (1, etc.) that performs predetermined calculation processing on the digital input signal and outputs a serial digital output signal (output data 8B, etc.) for controlling the device to be controlled;
, an output unit (2, 3, etc.), the control system is provided between the calculation section and the input section, the digital input signal is always input to the calculation section from the operation system input section, and the input section a first switching means (switching section 11, etc.) that switches input from the standby system input section when an abnormality occurs; A second switching means (switching section 21, 31, etc.) that outputs an output from the output section and switches the output from the standby output section when the output section is abnormal.

[For use]

The same signal is output to the input terminals of the operating system input section and the standby system input section to the calculation section, respectively, and the output terminal of the operating system output section to the switching section and the output terminal of the switching section of the standby system output section Since the same signal is output to both, even if these are switched from the active system to the standby system due to an abnormality in the input section or output section, there is almost no time delay in processing due to this switching.

【Example】

FIG. 1 is a block circuit diagram showing one embodiment of the present invention.
This corresponds to FIG. In Figure 1, 1
is a calculation unit that performs a predetermined calculation based on the input data 7A from the controlled device 10 and obtains output data 88 for controlling the controlled device 10, and this calculation unit 1 includes the switching unit shown in FIG. 12 is replaced by a switching section 11 that only switches between the active system input section 5 and the standby system input section 6, and the switching section 11 is provided in place of the switching section 12, which only switches between the active system input section 5 and the standby system input section 6. The structure is similar to the one shown in the figure. The input data 7A is analog data that indicates the operating status of the controlled device 10, and the input data 7A is analog data indicating the operating status of the controlled device 10.
71 to 7n), respectively. Operating system input section 5
and the configuration and operation of the standby system input section 6, and this input 5.
, 6 and the detection unit 7 are exactly the same as in the case of FIG. In addition, the connection between these inputs 5 and 6 and the detection unit 11 is also connected to the second
The connection between the input section 5.6 and the switching section 12 in the figure is exactly the same. In addition, the operating system output section 2. The configuration and operation of the standby output section 3 and the connections between this output section 2.3 and the calculation section 1 and the operation section 4 are exactly the same as in FIG. Note that each switching section 21.31 is connected to at least this output section 2゜3.
It is assumed that the serial and digital output data 8B is converted into an operation signal 48 and placed therein. Therefore, in this example, the switching units 21.31 are provided between the D/A converters 2b, 3b and the multiplexers 2G, 3G, respectively. With this configuration, when an abnormality occurs in the operation system input section 5, the abnormality is detected using the input data abnormality detection means (not shown) provided in the calculation section l, and the operation system in which the abnormality has occurred is detected. The system input section 5 is switched to the standby system input section 6 by the switching section 11 provided in the calculation section 1, but the input data 7A has reached the standby system input section 6 (that is, the input section 6 is switched to the standby system input section 6). (The same serial digital data 9A is output to the entrance of the switching unit 11), so there is almost no time delay due to switching. In normal standby redundant redundant computer systems, the standby system is not operating (it is operating normally, but only the data is stored in the active system, and the data in the standby system is This is because the input data 78 has reached the output end of the standby system input section 6 because it is reserved.Furthermore, if an abnormality occurs in the active system output section 2, the input data 78 has reached the output terminal of the standby system input section 6. An abnormality is detected using an abnormality detection means of output data outside, and the operating system output unit 2 in which the abnormality has occurred is output 2.
However, the output data 8B has reached the switching unit 31 of the standby output unit 3 (that is, the output unit 3 has reached the switching unit 31 of the standby output unit 3).
(The output part 2 outputs the same output signal to the output terminal of the calculation part 1 of the switching part 21 as the output terminal of the calculation part 1 side of the switching part 21.) Therefore, there is almost no time delay due to switching. do not have. In the above embodiments, it is assumed that the controlled device 10 sends and receives analog data, but even if the controlled device 10 directly sends and receives parallel digital data (therefore, the A/D converter 5b. 6b It is clear that the present invention can be applied even if the D/A converters 2b and 3b are omitted).

【Effect of the invention】

According to the present invention, when an abnormality occurs in the active system input section, the switching section provided in the calculation section switches to the standby system input section, and when an abnormality occurs in the active system output section, the switching section provided in the output section By switching to the standby output section using the switching section, the lack of data at the time of switching is eliminated, and data flow is prevented from being lost or delayed. This eliminates disturbances in the operation of the equipment to be controlled, and is particularly effective for devices that require various types of precise operational control, such as plant control that requires precise operational control.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing one embodiment of the present invention, and FIG.
3 and 3 are conventional block circuit diagrams corresponding to FIG. 1, respectively. i-1111 calculation section, 2---active system output section, 3-1--standby system output section, 2a, 3a --- serial/parallel converter, 2b, 3b ---D /A converter, 4 (41 to 4n) Operation section, 5 --- Active system input section, 6 --- Standby system input section, 5a, 6a
---Parallel/serial converter, 5b, 6b--A
/D converter, 20~6C: Multiplexer, 7 (71~
7n) ---Detection unit, 8--1---Output buffer, 9-----Each buffer, 10--1--Controlled device, 11.21.31--Switching section ,7A
-・Input data, 12: 7I Jukusha p

Claims (1)

[Scope of Claims] 1) A device to be controlled which is controlled by inputting a plurality of operation signals while outputting a plurality of detection signals, two input sections of an active system and a standby system, each of which has at least the same an input unit that sequentially executes a process of inputting the detection signal and converting it into the same serial digital input signal for each of the detection signals, and controlling the device to be controlled by performing predetermined arithmetic processing on the digital input signal; an arithmetic unit that outputs a serial digital output signal; and two output units, an active system and a standby system, each inputting at least the same digital output signal and converting it into the same operation signal. A control system comprising an output section that sequentially executes signals separately, the control system being provided between the arithmetic section and the input section, the digital input signal being always input to the arithmetic section from the operating system input section. , a first switching means for switching input from the standby system input section when the input section is abnormal; and a first switching means provided on the output side of the output section, which normally sends the operation signal to the control target device from the active system output. 1. A redundant switching device for a control system, comprising: second switching means for switching output from the standby output section when the output section is abnormal.