JPH02123401A - Process control system - Google Patents

Abstract

PURPOSE:To make a plant operation safe by rewriting the contents of a security list or a security table in accordance with an operation format or a situation and setting up security in an object to be operated. CONSTITUTION:A key switch 3 outputs at least the 1st or 2nd positional signal indicating a key OFF or ON state. When a keyboard 2 or screen operation is executed, the positional signal is read out by a key switch reading means 4 to decide the position of the switch 3. In the key OFF state, a corresponding code is read out from the security list 5 on an operated display CRT and operation information regulated by the code is read out from the security table 6. At that time, the list 5 and the table 6 are rewritten at every operated object. The security code and operation information corresponding to the code are read out based on the output signal of the means 4, and when a security control means 7 permits operation, the operation is executed in accordance with the operation information. Since operation is processed at every information, safe plant operation can be attained.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a process control system that controls and monitors a plant, and more specifically, a process control system that displays various information for plant control on a display such as a CRT. display,
This is a control system that controls a plant (process) by operating a keyboard, pointing device, etc., and relates to improving security functions to prevent human errors.

<Prior art> In a control system in which various information for plant control is displayed on a display and the plant is operated by keyboard operations, incorrect keyboard operations can seriously affect plant control. become. Therefore, conventionally, this type of system has been configured to provide security by providing a mechanical switching key that enables or disables keyboard operations.

<Problems to be Solved by the Invention> However, as systems become more automated, the information displayed on the display becomes more complex and sophisticated, and it is necessary to use multiple displays or display multiple screens while sequentially deploying them. plant (process) while displaying or even displaying multiple operating instruments on one screen.
It is becoming common practice to drive and monitor vehicles.

Under these circumstances, there is a growing demand for security to be applied to each screen and each instrument displayed within the screen in accordance with their nature and form. That is, in normal plant operations, there are some instruments that it is safer to not allow operators to operate.

Additionally, there are screens or instruments that contain system data and require operation, but do not require operation under other operating conditions. This is because safer plant operation can be ensured by setting a security day for each operation target according to the operating form and operating situation.

An object of the present invention is to realize a control system having a security function that meets such demands.

Means for Solving the Problems> The present invention to solve the above problems is a control system that displays various information for plant control on a display and controls the plant by keyboard or screen operations. , a key switch that outputs at least a first position signal indicating a key-off state and a second position signal indicating a key-on state, and a key switch signal that reads the position signal of the key switch when a keyboard or screen operation is performed. a reading means, a security list defining a rewritable security code for each operated object, a security table defining rewritable operation information for the security code, and a signal from the key switch signal reading means. is input, and if the signal indicates the key-off state, the security code of the operated object is read from the security list, the operation information for this security code is read from the security table, and the operation according to the operation information is permitted. It consists of security management means.

<Operation> Even if the key switch is in the key-off state, it is possible to perform operations according to the operation information for the security code read from the security list determined for each operation target. This realizes a so-called user-friendly system while maintaining security.

Practical example Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In the figure, reference numeral 1 denotes a display such as a CRT, and a plurality of displays are used as necessary, on which various information for plant control, instrument diagrams, soft keys, and other operation objects are displayed. Reference numeral 2 denotes a keyboard, from which display requests, data input, etc. are performed using keys. These displays and keyboards are configured to function as a man-machine interface to control the plant by operating them.

3 is a key switch that outputs at least a first position signal that indicates the key-off (KEY' 0FF) state and a second position signal that does not indicate the key-on (KEYON) state; here, engineering is permitted in addition to this. Condition (E
A device that outputs a third position signal indicating NG) is used. This key switch 3 includes a key 31 for the operator.
A key 32 for the engineer is prepared, and the operator key can only move to the first and second positions, whereas the engineer key 32 can move to all positions. There is.

4 is a key switch signal reading means for reading the position signal of the key switch 3 when the keyboard 2 or the screen is operated; 5 is a key switch signal reading means for each operated object (for each plurality of displays,
A security list defines a security code for each screen displayed on the display (for each screen displayed and each instrument within the displayed screen), 6 is a security table that defines operation information for the codes defined in security list 5, and 67 is a key When a signal from the switch signal reading means 4 is input and the signal indicates a six-off state, the security code of the operated object is not read from the security list 5, and the operation information for this security code is stored in the security table 6. This is a security management means that reads information from the computer and permits operations according to the operation information. This security management means 7 is realized, for example, by an application program executed on a central processing unit (CPU).

FIG. 2 is a diagram showing an example of the security list 5. As shown in FIG. Here, it is assumed that a plurality of displays (CRTs) are used, and a CRT security list driver 1, a screen security list 52, and a security list 53 of instruments displayed on the screen are provided. CR'
In the l' security list 51, a security code is determined for each CR'I', such as 'OJ, r2', etc., and in the screen security list 52, a security code is determined for each screen name, such as roJ, rlJ, etc. The security list 53 of the instruments displayed on the screen includes "0" for each tag number attached to each instrument.

It is set as ``2''.

FIG. 3 is a diagram showing an example of a security table that defines operation information for security codes defined in the security list 5.

Also provided here are a CRT security table 61, a screen security table 62, and a security table 63 for instruments displayed on the screen. And for example C
In the case of "R'T", security operations such as whether to allow display, confirmation, or operation are set as "1" to allow, and "0" to disallow.
data is specified.

Here, the security list 5 shown in FIG. 2 and the security table 6 shown in FIG. has been done.

The operation of the system configured in this way will be explained next.

FIG. 4 is a flowchart showing an example of the operation. Here, the case where the instrument diagram displayed on the screen is operated is shown.

Now, in the instrument diagram displayed on the display screen,
For example, when attempting to change a set value by operating a key on the keyboard 2 corresponding to the instrument diagram, the key switch signal reading means 4 first reads the signal from the key switch 3 to determine the current position of the key. Determine whether the switch is placed. Here, if the key is in the key-on state or the engineering (ENG) state, the operation and display according to the instrument diagram on the operated display screen is executed.

On the other hand, if the key is off, first the security code corresponding to the currently displayed and operated CR'I' is read out from the CRT security list 51. Subsequently, the operation information specified in the read security code is read from the CRT security table 61.

Here, if the operation information is "0" indicating that display or operation is not permitted, "The operation is not allowed on this CRT."
An error message saying "This operation cannot be performed" is displayed and the process ends.

On the other hand, if the operation information is "1" indicating that display or operation is permitted, then the security code is read from security list 5 for the screen or instrument diagram that was displayed or operated first. However, the operation information corresponding to this security code is then read from the security day table 6.

If this operation information is "1" indicating that display or operation is permitted, display or operation of the operated screen or instrument diagram is executed. Further, if the operation information is "0" indicating that display or operation is not permitted, an erroneous operation message is displayed saying "that operation cannot be performed on this screen (or instrument diagram)" and the process ends.

In this embodiment, when the key switch 3 is placed in the key-on (ON) position, normal operations and monitoring for controlling the plant from each CRT, each screen, and each instrument diagram are permitted. , also an engineer (
If it is placed in the ENG) position, system creation, system maintenance, etc. are permitted.

<Effects of the Invention> As described in detail above, according to the present invention, by rewriting the contents of the security list and security table according to the driving style and driving situation, fine-grained security can be provided for each operation target. This makes it possible to create a process control system that is user-friendly and can guarantee safe plant operation.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram showing one embodiment of the present invention, and FIG.
3 is a diagram showing an example of a security list, FIG. 3 is a diagram showing an example of a security table defining operation information for security codes defined in the security list, and FIG. 4 is a flowchart showing an example of the operation. DESCRIPTION OF SYMBOLS 1...Display, 3...Key switch, 4...Key switch signal reading means, 5...Security list, 6...Security table, 7...Security management means, 2...Keyboard ,

Claims (1)

[Claims] A control system that displays various information for plant control on a display and controls the plant by keyboard or screen operations, the control system comprising at least a first position signal indicating a key-off state; , a key switch that outputs a second position signal indicating the key-on state; a key switch signal reading means that reads the position signal of the key switch when a keyboard or screen operation is performed; and a key switch signal reading means that can be rewritten for each operated object. A security list that defines security codes, a security table that defines rewritable operation information for the security codes, and a signal from the key switch signal reading means are input, and the signal indicates a key-off state. A process control system comprising: a security management means for reading a security code of an operated object from a security list, reading operation information for this security code from a security table, and permitting an operation according to the operation information.