JPH05100704A - Control device - Google Patents

Abstract

PURPOSE:To construct a dual system in accordance with plural control units through very simple constitution. CONSTITUTION:Intervals between one management unit 3 and plural control units 2 (2A, 2B, 2C) are connected through an internal communication line 1. Besides, one backup control unit 5 to operate at the time when abnormality occurs in any control unit 2 is connected to the internal communication line 1. A switching circuit 4 is arranged between each control unit 2 and the backup control unit 5. The management unit 3 detects the control unit 2 in which the abnormality occurred on the basis of data from each control unit 2. It switches the contact of the switching circuit 4 corresponding to the corresponding control unit 2 to a backup control unit 2 side on the basis of this detection so that the backup control unit 5 operates in place of the abnormal control unit 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a system in which a plurality of adjusting units manage data by a management unit via an internal communication line, and a thermocouple, a resistance temperature detector, a DC voltage, a DC which are taken as inputs. A control device capable of urgently responding to an abnormality such as a failure of an adjustment unit when a signal such as an electric current is control-calculated based on setting data such as PID and the calculated result is sent as a control output. Is.

[0002]

2. Description of the Related Art For example, in a sequence control device for controlling reading and writing of various data by a CPU, constituent parts (CPU, R) having the same function as a duplication system.
It is known that two sets (AM, ROM, etc.) are arranged in one housing from the beginning. That is, in this control device, if one component fails, data is not read or written normally, and an operation error occurs and an error signal is output, the other component that functions the same will immediately operate. Switching between the corresponding components is performed as described above.

[0003]

However, in this type of control device, in order to construct a dual system,
There are two components that function the same in the same housing.
Since the sets are arranged one by one, there is a problem that not only the hardware structure in the apparatus becomes complicated but also the apparatus itself becomes expensive. Further, since each component is arranged in the same housing, it is not possible to immediately incorporate it into a ready-made device as needed and simply configure it.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a control device capable of constructing a duplex system corresponding to a plurality of adjusting units with an extremely simple structure. To do.

[0005]

In order to achieve the above object, a control device according to the present invention transmits data mutually between a plurality of adjusting units 2 and a management unit 3 which are connected via an internal communication line 1. Then, in the control device in which each of the adjusting units processes an input signal based on the data from the management unit or its own setting data and sends an adjusting output, a backup adjusting unit 5 connected to the internal communication line, A backup adjusting unit and a switching circuit 4 disposed between the adjusting units are provided, and the management unit is applicable when any abnormality of the adjusting units is detected based on the data from the adjusting unit. The contacts 9c and 10c of the switching circuit corresponding to the adjusting unit are switched to the backup adjusting unit side. It is set to.

[0006]

[Function] The management unit 3 and each adjustment unit 2 (2A, 2
B, 2C) and data is transmitted to and from each other, and each adjusting unit 2 processes an input signal based on the data from the management unit 3 or its own setting data and sends an adjusting output. When an abnormality occurs in the adjustment unit 2 (for example, 2A) of the above, the management unit 3 detects this abnormality from the data of the adjustment unit 2A transmitted via the internal communication line 1, and the management unit 3 backs up the backup adjustment unit. After sending the setting data and the adjustment control data of the adjusting unit 2A to 5, the contacts 9c and 10c of the switching circuit 4 corresponding to the corresponding adjusting unit 2A are switched to the backup adjusting unit 5 side and replaced with the abnormal adjusting unit 2A. The backup adjustment unit 5 operates.

[0007]

1 is a block diagram showing an embodiment of a control device according to the present invention, and FIG. 2 is a block diagram showing a relay changeover switch circuit in the control device. The control device according to this embodiment includes a plurality of adjustment units 2 (2A, 2B, 2C) and a management unit 3 via an internal communication line 1.
Are connected to each other, and the management unit 3 transmits / receives data to / from each adjustment unit 2 through the internal communication line 1 and collectively stores the data of each adjustment unit 2 to a host computer (not shown). It is transmitting.

Each adjusting unit 2 is composed of, for example, a digital program controller and is connected in parallel to the internal communication line 1. The input terminal portion 2a and the output terminal portion 2b of each adjusting unit 2 are connected to the switching circuit 4. .. Each adjusting unit 2 can incorporate a plurality of types of program patterns according to the control target, and a setter that selects the program pattern, sets the number of steps, and sets various parameters such as measured values, set values, operation output values, and PID constants. 2 c and an arithmetic control unit (microprocessor) 2 d for performing signal processing such as display and PID arithmetic based on the setting data from the setting unit 2 c or the setting data from the management unit 3. In addition, any one of a thermocouple, a resistance temperature detector, a DC voltage, and a DC current is input as an input signal to the input terminal portion 2a of each adjustment unit 2. Further, the output control section 2b for transmitting the adjustment output signal-processed by the operation control section 2d includes the operation control section 2b.
The current output, the on / off pulse type output, or the SSR drive pulse type output, which is the output result of the control calculation of the PID or the like, is sent out as the control output by d.

Further, in the internal communication line 1, a backup adjustment unit 5 having an input terminal section 5a, an output terminal section 5b, a setting unit 5c and an arithmetic control section 5d is arranged in parallel with the adjustment unit 2 as in each adjustment unit 2. It is connected to the. The backup adjusting unit 5 operates in place of the adjusting unit 2 having an abnormality when an abnormality occurs due to a failure of any of the adjusting units 2. The backup adjusting unit 5 has an input terminal portion 5a and an output terminal. The section 5b is connected to the switching circuit 4, and the output value of the output terminal section 5b is normally set to 0%.

The management unit 3 transmits and receives data to and from each of the adjustment units 2 connected in parallel via the internal communication line 1, and collects information of each adjustment unit 2 at a constant cycle. .. More specifically, instead of the setting device of each adjustment unit 2, setting data for selecting a program pattern, setting the number of steps, setting measurement values, setting values, operation output values, setting various parameters such as PID constants is adjusted. The data is transmitted to each unit 2, and various data such as set values, measured values, output values after control calculation of PID, etc. for each adjustment unit 2 are collected and managed. Further, when an abnormality occurs in the adjusting unit 2 due to a failure or the like, the management unit 3 detects an error signal output from the corresponding adjusting unit 2, and a coded predetermined signal indicating the adjusting unit 2 in which the abnormality has occurred. A switching command signal of the number of bits (for example, 3 bits) is output to the switching circuit 4. Further, when the management unit 3 detects an abnormality in the adjustment unit 2, the management unit 3 transmits the output value immediately before the abnormality in the adjustment unit 2 to the backup adjustment unit 5 via the internal communication line 1, which will be described in detail later. After the abnormal adjustment unit 2 is switched to the backup adjustment unit 5 by the switching circuit 4, the setting data and adjustment control data of the abnormal adjustment unit 2 are transmitted to the backup adjustment unit 5.

The switching circuit 4 includes a decoder section 6, a relay section 7,
The changeover switch unit 8 is provided. The decoder section 6 is provided when an abnormality occurs in any of the adjustment units 2,
The encoded switching command signal from the management unit 3 is decoded and output to each relay unit 7. The relay section 7 is provided corresponding to the number of the adjustment units 2, and drives the contacts 8a in each changeover switch section 8 on and off based on the decode signal from the decoder section 6. Changeover switch section 8
Are provided corresponding to the number of adjustment units 2 and are provided with an input side changeover switch 9 and an output side changeover switch 10. One end 9a of the input side changeover switch 9 is connected to the input terminal portion 2a of each adjustment unit 2. The other end 9b is connected to the input terminal portion 5a of the backup adjustment unit 5. Further, one end 10 a of the output side changeover switch 10 is connected to the output terminal portion 2 b of each adjustment unit 2, and the other end 10 b is connected to the output terminal portion 5 b of the backup adjustment unit 5.

In the above structure, normally, the setting data is transmitted from the management unit 3 to each adjusting unit 2, and each adjusting unit 2 processes the signal input from the input terminal section 2a based on the setting data. , The value of the result of control calculation such as PID is sent from the output terminal section 2b as the adjustment output. Further, various data indicating the setting and output information in each adjusting unit 2 at this time is periodically transmitted to the managing unit 3 for each adjusting unit 2, and the managing unit 3
Transmits the data from each adjustment unit 2 to the host computer in a lump.

Here, when an abnormality occurs in the adjusting unit 2A due to a failure or the like, the management unit 3 receives an error signal from the corresponding adjusting unit 2A on the basis of the data transmitted from each adjusting unit 2, and the abnormality occurs. To detect. As a result, the management unit 3 outputs to the switching circuit 4 a coded switching command signal indicating the adjusting unit 2A in which the abnormality has occurred. In the switching circuit 4, the coded switching command signal is decoded by the decoder unit 6, and the decoded signal causes the contacts 10c of the input-side switching switch 9 and the output-side switching switch 10 corresponding to the adjustment unit 2A in which an abnormality has occurred to be backed up. Switching to the adjustment unit 5 side.

Further, in parallel with the above-mentioned operation, the management unit 3 transmits the setting data and the adjustment control data of the adjusting unit 2A immediately before the abnormality occurs to the backup adjusting unit 5 via the internal communication line 1. Then, the backup adjustment unit 5 processes the signal input to the input terminal portion 2a based on the setting data or the like instead of the abnormal adjustment unit 2A, and sends the result of the control calculation to the output terminal portion 2b as the adjustment output. This operation is performed until the abnormal adjustment unit 2A returns to the normal state, and when the adjustment unit 2A returns to the normal state, the input side changeover switch 9 and the output side changeover switch 10 corresponding to the adjustment unit 2A in the changeover circuit. The contact 10c of is switched to the adjustment unit 2A side. This return operation is performed by a manual switch operation from the outside or a signal based on another detecting means.

Therefore, in the above-described embodiment, one management unit 3 includes a plurality of adjustment units 2 (2A, 2B, 2).
C) Data is transmitted to and from the control unit 2 to grasp the state of each control unit 2, and when an abnormality occurs in any of the control units 2, the management unit 3 detects this abnormality, Since the switching circuit 4 is switched to the backup adjusting unit 5 side instead of each adjusting unit 2 based on the switching command signal to operate, it is necessary to dispose a component for duplicating each device as in the prior art. Instead, the entire system can be configured at low cost and simply by using one backup adjusting unit 5 and the switching circuit 4, and a duplex system can be constructed corresponding to the plurality of adjusting units 2. Further, since the switching circuit 4 only performs wiring connection between each adjustment unit 2, the management unit 3, and the backup adjustment unit 5, only the important parts of the plurality of adjustment units are duplicated, or each adjustment unit is replaced. It is possible to immediately deal with the case where the system is expanded after installation to improve the system.

By the way, in the above-mentioned embodiment, in order to simplify the structure, only one backup adjusting unit 5 is provided, and one adjusting unit 2 (2A, 2B, 2C), the case where the backup adjustment unit 5 is operated has been described. However, when an abnormality occurs in a plurality of adjustment units at the same time, the adjustment unit connected to the highest order side with respect to the management unit. Has priority.

Further, since the control device in this embodiment requires a certain amount of time (several seconds) to switch the adjusting unit 2 in which an abnormality has occurred to the backup adjusting unit 5, a control with slow response such as temperature control is performed. It is particularly effective when applied to the target.

[0018]

As described above, according to the control device of the present invention, since one backup adjusting unit and the switching circuit are added, the constituent components for duplication are provided in the same housing as in the conventional case. The entire system can be simply configured at low cost without arranging two sets each and complicating the configuration, and a dual system can be constructed corresponding to a plurality of adjusting units.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing an embodiment of a control device according to the present invention.

FIG. 2 is a block configuration diagram of a switching circuit in the control device.

[Explanation of symbols]

 1 Internal communication line 2 Adjustment unit 3 Management unit 4 Switching circuit 5 Backup adjustment unit 9 Input side changeover switch 9c contact 10 Output side changeover switch 10c contact

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ikuo Matoba 32-8, Kumano-cho, Itabashi-ku, Tokyo

Claims (1)

[Claims] 1. Data transmission mutually between a plurality of control units (2) and a control unit (3) connected via an internal communication line (1), each control unit from the control unit. In a control device for processing an input signal based on data or its own setting data and outputting a regulated output, a backup regulating unit (5) connected to the internal communication line, and the backup regulating unit and each regulating unit. A switching circuit (4) disposed in the control unit, the management unit corresponding to the corresponding adjustment unit when any abnormality of the adjustment unit is detected based on the data from the adjustment unit. A control device characterized in that the contacts (9c, 10c) of a switching circuit are switched to the backup adjustment unit side.