KR100956321B1 - Plant control system - Google Patents

Abstract

Program editing means 10 for creating a control program including an interlock condition and an interlock diagnosis, a plant control means CONT1 for executing a program object in the control program, and a function equivalent to the plant control means CONT1. It has a plurality of plant control means (CONT2, CONT3, ..., CONTn), a logic operation unit and a display unit, and update and display the establishment / failure or the latest non-establishment time at a predetermined time point before the current point of the interlock condition, Moreover, even if the interlock circuit is provided in multiple stages, the interlock diagnosis means 20 which specifies only the factor of non-compliance, and displays it automatically in schematic language, and the operator operation display apparatus HMI which are operated by a plant driver are provided. And a plant control system in which the operator operation and display device has a function equivalent to that of the interlock diagnosis means 20.

Control program editing means, logic / ladder conversion unit, interlock status reading server unit

Description

Plant Control System {PLANT CONTROL SYSTEM}

The present invention relates to a plant control system, and more particularly, to an apparatus for creating, displaying and diagnosing a plant control program.

In general, in constructing a plant control system, a system programmer provides a plant operator with a program for automatically operating the plant as a control program of the plant control device, after the test and adjustment.

Here, in order to safely control the plant, the system programmer must equip the control program with an interlock condition (permission condition for device operation) of starting and operating a plant device such as a rotating machine. Whether or not an interlock condition is established is a natural concern of the plant driver, and therefore, it is required to present it to the plant driver in an understandable manner.

Conventionally, when the plant equipment is stopped, the establishment and failure of the interlock condition at the predetermined time point before the present is updated and displayed, and even if only a plurality of interlock circuits are formed, only the source factor variable of the failure is specified. A plant system control system with an interlock diagnostic means for automatically displaying in schematic language has been proposed (see patent application 2004-201978).

In addition, in order to support plant operators, even if the interlock condition is satisfied or not established, even if the interlock circuit is formed in a plurality of stages, the function of specifying only the source factor variable of the non-establishment and automatically displaying it in the schematic language is shown by the general operator display. A plant control system has been proposed that operates on a device and can easily detect an incomplete interlock condition among a large number of interlock conditions by a hierarchical display order.

 However, the conventional plant control system has the following drawbacks.

(a) The interlock diagnosis function of updating and displaying the establishment and failure of the interlock condition and specifying only the source factor variable of the establishment and displaying it automatically in schematic language even when the interlock circuit is provided in multiple stages is one plant control means. Only for the interlock circuit of.

Therefore, when the interlock condition used by any plant control means is interfaced as the representative contact point by other plant control means connected to the network, the individual interlock condition by which the other plant control means establishes the representative contact point. It is impossible to monitor the status of the establishment or independence of

(b) The interlock diagnosis function, which indicates whether the interlock condition is established or incomplete, and which only the origin factor variable of the incomplete condition is specified and is automatically displayed in the schematic language even when the interlock circuit is formed in plural stages, has not been established for the first time. The contact is detected and presented on the interlock diagnosis screen. And second, third,... , the nth failed contact cannot be detected.

The present invention has been made in consideration of the above-described points,

1) Even if the interlock condition used by any plant control means is interfaced as a representative contact point by other plant control means connected to the network, the establishment and failure of individual interlock conditions for establishing the representative contact point in the other plant control means. Function of displaying on the interlock diagnosis screen as one of the source factor contact points that the individual interlock conditions in other plant control means are also incomplete by monitoring the state of

2) Even if a plurality of stages of interlock circuits are formed, only the originating source contact points of the non-establishment are identified, and in addition to the function of detecting the first non-established contact point and displaying on the interlock diagnosis screen, the second, third,... An object of the present invention is to provide a plant control system having a function of detecting an n-th unsuccessful contact point and displaying it on the interlock diagnosis screen.

In order to achieve the above object, the present invention provides a control program editing means for creating a control program including an interlock condition and an diagnosis of an interlock;

A plurality of plant control means for executing a program object in said control program;

It has a logic operation unit and a display unit, and updates and displays the establishment and failure of the interlock condition at a predetermined time point before the present time in an arbitrary plant control means, and specifies only the origin factor contact of the failure even if a plurality of interlock circuits are formed. In addition to the automatic display of the interlock diagnosis screen in the schematic language,

Even when the interlock condition used by any plant control means is interfaced as a representative contact point from other plant control means connected to the network, the state of establishment or incomplete of individual interlock conditions for establishing a representative contact point in another plant control means By monitoring, the function of displaying on the interlock diagnosis screen the individual interlock conditions in other plant control means as one of the source factor contact points which are not established, and,

Even if a plurality of interlock circuits are formed, only the source of the non-existing current source is identified, and in addition to the function of detecting the first non-established contact and displaying it on the interlock diagnosis screen, the second, third,... interlock diagnostic means having a function of detecting an n-th unsuccessful contact point and displaying it on the interlock diagnosis screen;

In the plant cab, on a general operator operation and display device operated by a driver, a plant control system having a function of the interlock diagnosis means and having an operator operation and monitoring means having a function of displaying the interlock diagnosis screen is provided. will be.

1 is a conceptual diagram showing the overall configuration of a first embodiment of the present invention.

2 is a ladder circuit diagram illustrating an example of a control program including an interlock.

3 is an explanatory diagram showing an example of an interlock diagnosis screen in the first and second embodiments of the present invention;

4 is an explanatory diagram showing an example of an interlock diagnosis screen in the third and fourth embodiments of the present invention.

5 is an explanatory diagram showing an example of an interlock diagnosis screen in Examples 5, 6, 7, and 8 of the present invention;

Fig. 6 is an explanatory diagram showing an example of an HMI screen and an interlock diagnosis screen in the ninth and tenth embodiments of the present invention.

Fig. 7 is an explanatory diagram showing an example of the interlock diagnosis screen and the operation method thereof in the eleventh and twelfth embodiments of the present invention.

8 is an explanatory diagram showing an example of an HMI screen and an interlock diagnosis screen in Embodiments 13, 14, 15, and 16 of the present invention;

Explanation of symbols for the main parts of the drawings

10: control program editing means 11: program compiler

12: ladder / logical conversion unit 13: program load client unit

20: interlock diagnostic means 21: logical readout

21: Interlock state client unit 23: Factor specific logical conversion unit

24: logical synthesis unit 25: logic / ladder conversion unit

30: database unit 31: source file unit

32: object file portion 33: logical file portion

40: object memory 41: data memory

42: code memory 50: standard processing unit

51: code program server 52: program execution processing unit

53: process input / output processing unit 54: interlock state reading server unit

60: screen operation display means 61: screen program unit

62: database unit

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to an accompanying drawing.

Example 1

(Configuration of Example 1)

First, Embodiment 1 will be described with reference to FIGS. 1 to 3.

1 is an overall configuration diagram of Embodiment 1 of the present invention, which is composed of approximately four parts. That is, the controller CONT1 as the plant control means, the computer COMP as the control program creation and display means, and the general operator operation and display device HMI (human machine interface device) operated by the driver in the plant cab. And a plurality of controllers CONT2, CONT3, ..., CONTn having a function equivalent to that of the controller CONT1, in addition to the conventional plant control system constituted by a LAN (local area network) connecting the former. It is comprised by these, and these some controllers CONT2, CONT3, ..., CONTn are also connected to LAN.

The controllers CONT1, CONT2, CONT3, ..., CONTn are roughly divided into two parts, an object memory 40 for storing control program objects, and a standard for writing, reading, and executing them. It has a processing part 50.

The object memory 40 is constituted by the data memory 41 and the code memory 42.

The data memory 41 includes internal data of an interlock diagnostic function block DIAG, which will be described later, in addition to the normal interlock contact. In addition to the normal program code, the code memory 42 includes the internal code of the interlock diagnostic function block DIAG.

The standard processing unit 50 includes a program load server unit 51 for arranging the object program of the control program transmitted via the LAN in the data memory 41 and the code memory 42, the controllers CONT1, CONT2, CONT3, ..., the program execution processing unit 52 for executing the control program, that is, the code memory in CONTn, the process input / output processing unit 53 for giving the control program a process contact from the plant, and the interlock circuit state during execution of the control program. Is configured by an interlock state reading server unit 54 for reading.

On the other hand, the computer COMP is roughly divided into three parts, a control program editing means 10 for creating a control program by a system programmer, a database unit 30 storing a logical expression of the control program and an interlock, It is comprised by the interlock diagnostic means 20 for a plant driver to know the cause of the incompleteness of an interlock condition.

The control program editing means 10 includes a program compiler 11 for converting a source file of a control program into an object file as an internal processing element, and a ladder (LD) / logical expression for converting a specified interlock circuit in the control program into a logical expression. It is comprised by the conversion part 12 and the program load client part 13 for sending the object file of a control program to a controller.

The database unit 30 includes a source file unit 31 for storing a source file of the control program, an object file unit 32 for storing an object file of the control program, and a logical expression for storing a logical expression of a designated interlock circuit. The file part 33 is comprised. The source file unit 31 includes a source of an interlock diagnostic function block described later. The object file unit 32 includes internal data and code of an interlock diagnostic function block described later.

The interlock diagnosis means 20 is constituted by a logic operation section and a display section. The logical operation section includes a logical reading section 21 for reading the logical expression of the designated interlock from the file, an interlock state reading client section 22 for reading the past and current contact states of the designated interlock circuit from the controller, the logical expression and its A factor-specific logic expression converting section 23 for specifying an incomplete factor of an interlock condition from a contact state, a logic formula combining section 24 for synthesizing a multi-stage logic expression into one logic expression, and a ladder circuit are drawn from the logic expression ( The logical expression / ladder (LD) conversion part 25 for this is comprised.

The display unit displays the operation result by the logic operation unit.

In addition, the general operator operation / display device (HMI) is roughly divided into two parts, and the operator operation / monitoring means 60 which is a general function for the operator to operate and monitor the plant, and the computer COMP are provided. It is comprised by the equivalent interlock diagnostic means 20 which performs the same function as an interlock diagnostic means.

The operator operation / monitoring means 60 includes a screen program unit 61 for storing a screen program for performing operation and monitoring necessary for plant operation, and a database unit 62 for storing data necessary for operation / monitoring information. Consists of.

(Operation of Example 1)

The system programmer uses the control program editing means 10 to create a control program including the interlock circuit of the plant device. Fig. 2 is an example of a control program written using the ladder language specified by JISB3503 (or IEC61131-3), the contents of which are used to drive the rotor M30 in an interlock circuit in the controller CONT1 at the top. The interlock circuit and the start circuit are shown.

Then, from the top of the control program shown in Fig. 2, an interlock circuit for outputting the interlock condition C5, an interlock circuit for outputting the operation condition RUN_PRM of M30, and a circuit for the M30 operation command M30_RUN are provided. .

In addition, in the interlock circuit in the lower controller CONT2, a circuit having a representative interlock condition X1 for interfacing to the controller CONT1 is provided.

The uppermost interlock circuit in FIG. 2 is composed of the contacts B1, B2, B3, B4, and X1, the interlock diagnostic function block DIAG, and the coil C5. The contact C5 is inserted into the second M30 driving interlock circuit.

The second M30 driving interlock circuit is composed of the contacts C1 to C7, the interlock diagnostic function block DIAG, and the coil RUN_PRM, and the contact RUN_PRM of the coil RUN_PRM is the third. Is inserted into the M30 operation command circuit.

The M30 driving circuit is constituted by the contacts START_PB, START_PRM, STOP_PB, M30_RUN, RUN_RPM, and the coil M30_RUN.

The lowest interlock circuit is composed of the contacts D1, D2, D3, D4 and D5, the interlock diagnostic function block DIAG, and the coil X1, and the contact X1 of the coil X1. ) Is interfaced to the top interlock circuit via LAN and is accommodated.

This interlock circuit has a feature of connecting an interlock diagnostic function block DAIG before its coil output. Referring back to FIG. 1, when the system programmer saves the control program, the control program is stored in the source file unit 31 of the database unit 30, and the source file is generated by the program compiler 11. The result is saved as the object file 32 of the database unit 30.

At this time, when the ladder / logical conversion unit 12 finds an interlock diagnosis function block, the ladder / logical conversion unit 12 searches for a ladder circuit connected to the input, generates a logical expression of the interlock, and saves it as a logical file of the database unit 30. .

After the system programmer has created and saved the control program, the system programmer writes these to the controller CONT to execute the control program. When writing to the controller CONT, internally, the program load client unit 13 pulls out the object file 32 of the database unit 30, and the program load server unit of the controller CONT via the LAN ( 51, the program load server unit 51 receives this, arranges it on the data memory 41 and the code memory 42 of the object memory 40, and the program execution processing unit 52 executes this. The control program is executed.

The contacts of the interlock circuit and the contacts of the coil are process contacts to be inputted and outputted from the outside of the controller CONT, which are provided to the program execution processor 52 from the process input / output unit 53 and operate.

Fig. 3 shows an interlock diagnosis screen, and in the conventional case at the top, the case of the present invention is shown at the bottom in a contrast form. First, an upper end of FIG. 3 is an example of display of a conventional interlock diagnosis screen by the interlock diagnosis means 20. In this display example, using the logical readout unit 21, the controller internal address of the interlock diagnosis function block is obtained from the name of the interlock contact point, and is passed to the interlock state readout client unit 22 to read the interlock state. The client unit 22 delegates to the interlock state reading server unit 54 of the controller CONT via the LAN.

Accordingly, the internal variables Permissive (current interlock status) and Time Stamp (past latest interlock failure occurrence time) of the running interlock diagnostic function block are obtained, and each field Live (presentation of the current interlock failure) is obtained. By displaying in Faulted (presentation of the latest interlock failure in the past), the display of the circuit name list of the interlock diagnosis target is realized.

In this [Live] column, when the corresponding interlock condition is not satisfied at this time, an interlock diagram of only the contact point that is the factor is displayed as a ladder circuit.

Further, in the [Faulted] column, the ladder circuit displays a contact point which is a trigger of the interlock failure (first cause) when the corresponding interlock condition is incomplete in the past.

3 is a display example of the interlock diagnosis screen by the interlock diagnosis means 20 with respect to the interlock circuit shown in FIG.

Conventionally, when the interlock condition X1 used in the controller CONT1 is interfaced as a representative contact from another controller CONT2 connected to the network, and the representative contact X1 itself is not established, the controller CONT1 In the interlock diagnosis screen indicating the interlock failure of, the state of the representative contact X1 is displayed as it is.

Here, the interlock diagnosis means 20 tracks the output source of the interlock condition X1 which is interfaced as the representative contact point from the other controller CONT2. In the case where this is received from the controller CONT2 and the standard interlock circuit is constituted by the interlock diagnostic function block DIAG, an invalid interlock condition in the interlock circuit of the controller CONT1. As in the case of detecting (C3, C30), the controller CONT2 finds the interlock condition D4 at which the representative contact X1 is not established, and the controller CONT2 is incomplete in the controller CONT1. Is displayed in the [Live] column of the interlock diagnosis screen instead of the representative contact (X1).

(Effect of Example 1)

As shown in Fig. 2, the conventional apparatus provides a system programmer with a uniform and simple programming method of inserting an interlock diagnosis function block into an existing interlock circuit, and the interlock diagnosis screen at the top of Fig. 3 [Live] As shown in the column, in the present and the past, the factor contact point and the trigger contact point at the time of interlock failure are provided to the plant operator in a form that can be understood at a glance as a ladder circuit.

In other words, in the conventional interlock diagnosis function, the plant driver supports the plant operation support function that responds simply to the question of why the plant driver has pressed the start button of the operation target device and cannot start it by presenting the current interlock failure. In addition, the plant driver's support function responds to the plant driver's answer to the question "Why did it stop when the operation target device stopped by the suggestion of the latest interlock failure factor" in the past, and also the latest interlock failure trigger factor in the past By the presentation of the plant, the plant driver realizes the plant driving support function which responds to "What was the 1st cause when the operation target equipment was stopped?".

In addition to this, the present invention can suggest the current interlock failure. That is, even if the interlock condition used by any controller is interfaced as a representative contact from another controller in the plurality of controllers CONT1, CONT2, CONT3, ..., CONTn connected to the network as the plant control means, this interlock condition is used. The output source of the controller is also tracked and simultaneously monitored for the establishment and failure of the individual interlock conditions for establishing a representative contact point in another controller. As one of the source factors of interlock failure in any controller to be monitored, as shown in the interlock diagnosis screen [Live] in the lower part of FIG. 3, the current interlock failure can be presented as a final individual contact.

As a result, the scope of the monitoring object is expanded and the operability of the monitoring function is improved. Therefore, regardless of the construction status of the interlock contact point interfaced between a plurality of controllers in a large-scale plant, the interlock condition of the target equipment is applied. In this regard, a device capable of quickly finding current information can be provided.

Example 2

3 shows the [Faulted] column of the second embodiment of the present invention, that is, the interlock diagnosis screen by the interlock diagnosis means 20.

In the first embodiment, an interlock used by an arbitrary controller in a plurality of controllers CONT1, CONT2, CONT3, ..., CONTn connected to the network as the plant control means in the interlock diagnosis screen [Live] column at the bottom of FIG. Even when the condition is interfaced as a representative contact from another controller, the status of the establishment or failure of the individual interlock conditions for establishing the representative contact in the other controller is also monitored, so as one of the source factor contacts of the interlock failure in any controller. It is displaying.

On the other hand, in Embodiment 2, in the interlock diagnosis screen [Faulted] column of the lower part of FIG. 3, arbitrary controllers are used by the some controller CONT1, CONT2, CONT3, ..., CONTn connected to the network as a plant control means. Even when the interlock condition is interfaced as a representative contact point from another controller, the output source of the interlock condition is traced, and the ladder circuit first displays the contact that has not been established, that is, the contact that triggered the interlock failure (first cause). Provides the ability to

The interlock diagnostic means 20 tracks the output source of the interlock condition X1 which is interfaced as a representative contact from the other controller CONT2, similarly to the first embodiment. When this is accommodated from the controller CONT2 and the interlock diagnosis function block DIAG constitutes a standard interlock circuit, the interlock circuit C3, C30 of the inconsistent state is set by the interlock circuit of the controller CONT1. Similarly to detection, the controller CONT2 finds the interlock condition D4 at which the representative contact X1 becomes incomplete, and when this becomes the trigger (first cause) of interlock failure, the interlock diagnosis screen [Faulted] is Indicated as a ladder circuit.

As a result, the scope of the monitoring object is expanded and the operability of the monitoring function is improved. Therefore, regardless of the construction status of the interlock contact point interfaced between a plurality of controllers in a large-scale plant, the interlock condition of the target equipment is applied. For this reason, it is possible to provide a device capable of quickly finding an interlock condition that has not been established for the first time.

Example 3

Fig. 4 shows the contents of Embodiment 3 of the present invention, that is, an interlock diagnosis screen and its operation method.

In the first embodiment, an interlock used by an arbitrary controller in a plurality of controllers CONT1, CONT2, CONT3, ..., CONTn connected to the network as the plant control means in the interlock diagnosis screen [Live] column at the bottom of FIG. Even when the condition is interfaced as a representative contact from another controller, the status of the establishment or failure of the individual interlock conditions for establishing the representative contact in the other controller is also monitored, so as one of the source factor contacts of the interlock failure in any controller. Display.

In the second embodiment, any controller is used in the interlock diagnosis screen [Faulted] in the lower part of FIG. 3 by a plurality of controllers CONT1, CONT2, CONT3, ..., CONTn connected to the network as the plant control means. Even when the interlock condition to be interfaced as a representative contact point from another controller, the first contact point that has not been established, that is, the trigger of the interlock establishment point, is also monitored by monitoring the state of the establishment or failure of the individual interlock condition that establishes the representative contact point in the other controller. It is indicated by the ladder circuit as the contact which became (1st cause).

In contrast, in the third embodiment, in a plurality of controllers CONT1, CONT2, CONT3, ..., CONTn connected to the network as the plant control means, when the interlock condition used by any controller is interfaced as a representative contact from another controller. In addition, by monitoring the status of the establishment or failure of individual interlock conditions for which a representative contact is established by another controller, the name of the current interlock failure contact displayed on the interlock diagnosis screen [Live] column or the interlock diagnosis screen [Faulted] column Select the variable property information (Device Property) expansion function for the name of the contact point of the latest interlock failure established in the above to expand and display the variable detail information screen of the corresponding variable, and also use the variable-use point information (Cross-reference). ) Provides the function to expand and display the variable use point information screen of the corresponding variable by selecting the expansion function. The.

As a result, the plant operator can collect detailed information on individual variables among a large amount of interlock circuits, quickly find information on the interlock conditions of the target equipment, and find out the cause of the interlock condition not being established. It is possible to provide an apparatus capable of performing the operation quickly.

Example 4

The interlock diagnosis screen of FIG. 4 and the operation method thereof show the contents of the fourth embodiment of the present invention, following the third embodiment of the present invention.

In the third embodiment, even when a plurality of controllers (CONT1, CONT2, CONT3, ..., CONTn) connected to the network as the plant control means, the interlock condition used by any controller is interfaced as a representative contact from another controller. In addition, by monitoring the status of the establishment or failure of the individual interlock conditions for establishing the representative contact point in another controller, the name of the current interlock failure contact point displayed in the interlock diagnosis screen [Live] column or the interlock diagnosis screen [Faulted] field is displayed. Variable Property Information (Device Property) regarding the name of the contact point of the past latest interlock failure displayed is selected and the variable detail information screen of the corresponding variable is expanded and displayed, and the variable use point information (Cross-reference) The expansion function is selected and the variable use point information screen of the corresponding variable is expanded and displayed.

In the fourth embodiment, on the other hand, in a plurality of controllers CONT1, CONT2, CONT3, ..., CONTn connected to the network as the plant control means, the interlock condition used by any controller is interfaced as a representative contact from another controller. In addition, from the variable use point information screen indicating that the variable use point cross-reference expansion function is selected and instructing the use point of the corresponding variable, for example, the corresponding interlock condition (D4) is executed in another controller (CONT2). Provides the ability to directly deploy and display the program being used.

As a result, the plant operator can extract detailed information about individual variables from the actual program, among a large amount of interlock circuits, and quickly find information about the interlock conditions of the target equipment, and the interlock conditions are not established. It is possible to provide a device capable of quickly performing a cause cause investigation.

Example 5

Fig. 5 shows the contents of the fifth embodiment of the present invention, that is, an interlock diagnosis screen.

In Example 1, in the interlock diagnosis screen [Live] column shown in the upper part of FIG. 3, when the corresponding interlock condition is not satisfied at this time, the interlock diagram of only the contact point which causes it is displayed by the ladder circuit, and [Faulted] In the column], in the past, the ladder contact point indicates the point of time when the interlock condition is not satisfied, that is, the trigger of the interlock failure (first cause).

In contrast, in the fifth embodiment, in the [Live] column of the interlock diagnosis screen of FIG. 5, when the corresponding interlock condition is not satisfied at the present time, an interlock diagram of only the contact point that is the factor is displayed by a ladder circuit, and among these interlock conditions, In the past, the contact point which has triggered the interlock failure (first cause) is displayed in [Faulted] (1st) by the ladder circuit, and the interlock diagnosis means 20 tracks and monitors the repetitive execution (scan) of the controller. Thereby, the second, third, and the contact is not satisfied in the n-th to the ladder circuit ^{[Faulted] (2 nd),} [Faulted] (3 rd), ... It provides a function to display in each column of.

As a result, the plant operator expands the scope of the monitoring target and improves the creation of the monitoring function, so that not only an interlock condition that was initially established with respect to the interlock condition of the target equipment in a large plant, but also a plurality of interlocks It is possible to provide a device that can quickly find the process of becoming unconditional.

Example 6

The interlock diagnostic screen of FIG. 5 shows the contents of the sixth embodiment of the present invention.

In the fifth embodiment, in the [Live] column of the interlock diagnosis screen of Fig. 5, when the corresponding interlock condition is not satisfied at the present time, an interlock diagram of only the contact point, which is the cause thereof, is displayed by a ladder circuit, and the latest among these interlock conditions is displayed. The contact that is the trigger (first cause) of the interlock failure is indicated by the ladder circuit in [Faulted] (1st), and the second, third, and nth failed contact is indicated by the ladder circuit in [Faulted]. (2 ^nd ), [Faulted] (3 ^rd ),... We display in each column of.

In embodiment 6, the interlock diagnosis screen [Faulted] (2 ^nd) of about ^{5, [Faulted] (3 rd)} , ... In each of the fields, even when the interlock conditions used by any controller are interfaced as representative contacts from other controllers in a plurality of controllers (CONT1, CONT2, CONT3, ..., CONTn) connected to the network as the plant control means, It provides the function of tracing the output source of this interlock condition and displaying the 2nd, 3rd, and nth failed contact by the ladder circuit.

The interlock diagnostic means 20 tracks the output source of the interlock condition X1 which is interfaced as a representative contact from the other controller CONT2, similarly to the first embodiment.

When this is accommodated from the controller CONT2 and the interlock diagnosis function block DIAG constitutes a standard interlock circuit, the interlock circuit C3, C30 of the inconsistent state is set by the interlock circuit of the controller CONT1. As in the case of detecting, the controller CONT2 detects the interlock condition D4 at which the representative contact X1 becomes incomplete, and when this fails in the second, third, and nth times, the interlock diagnosis screen is displayed. [Faulted] (2 ^nd ), [Faulted] (3 ^rd ),.. Mark the ladder circuit with each column of.

As a result, the plant operator expands the scope of the monitoring target and the operability of the monitoring function is taken into consideration, thereby interlocking the target equipment regardless of the construction status of the interlock contact point interfaced between the plurality of controllers in a large-scale plant. With respect to the condition, in addition to the interlock condition that was first not established, an apparatus capable of quickly finding a process in which a plurality of interlock conditions are not established can be provided.

Example 7

The interlock diagnosis screen of FIG. 5 shows Embodiment 7 of the present invention.

In the sixth embodiment, the interlock diagnosis screen [Faulted] (2 ^nd ), [Faulted] (3 ^rd ),. In each of the fields, even when the interlock conditions used by any controller are interfaced as representative contacts from other controllers in a plurality of controllers (CONT1, CONT2, CONT3, ..., CONTn) connected to the network as the plant control means, The output source of this interlock condition was traced, and the 2nd, 3rd, and nth unsuccessful contact points were displayed by the ladder circuit.

In the seventh embodiment, in the case where a plurality of controllers (CONT1, CONT2, CONT3, ..., CONTn) connected to the network as the plant control means, the interlock condition used by any controller is interfaced as a representative contact from another controller, establishment of individual interlock condition to establish a representative point of contact with a different controller, by also monitoring the status of the results in failure, and this 2 [Faulted] (2 ^nd) of, even if the second, results in failure in the third, and the n-th, the interlock diagnosis screen , [Faulted] (3 ^rd ),.. Select the variable property information (Device Property) expansion function for the contact name of the interlock failure established by the ladder circuit in each column of the column, and expand and display the variable detail information screen of the corresponding variable, and also use the variable use point information (Cross). -reference) Provides the function to expand and display the variable use point information screen of the corresponding variable by selecting the deployment function.

As a result, the plant operator can expand the scope of the monitoring target and improve the operability of the monitoring function, thereby collecting detailed information on individual variables among a large amount of interlock circuits in a large plant. Irrespective of the construction status of the interlock contact that is interfaced between the controllers of the controllers, the interlock condition is not established by quickly finding the process of the plurality of interlock conditions becoming incomplete, and also quickly finding information on the interlock conditions of the target equipment. It is possible to provide a device capable of quickly performing a cause investigation that is performed.

Example 8

The interlock diagnostic screen of FIG. 5 shows Embodiment 8 of the present invention.

In the seventh embodiment, in the case where a plurality of controllers (CONT1, CONT2, CONT3, ..., CONTn) connected to the network as the plant control means, the interlock condition used by any controller is interfaced as a representative contact from another controller, The interlock diagnosis screen [Faulted] (2) of FIG. 5 is also monitored by monitoring the state of the establishment or failure of the individual interlock conditions for establishing the representative contact point in other controllers, even when they become the 2nd, 3rd, and nth times. ^nd ), [Faulted] (3 ^rd ),.. Select the variable property information (Device Property) expansion function for the contact name of the interlock failure established by the ladder circuit in each column of the column, expand and display the variable detail information screen of the corresponding variable, and also use the variable location information (Cross). -reference) The expansion function was selected to expand and display the variable use point information screen of the corresponding variable.

In the eighth embodiment, on the other hand, in a plurality of controllers CONT1, CONT2, CONT3, ..., CONTn connected to the network as the plant control means, when the interlock condition used by any controller is interfaced as a representative contact from another controller. to, by also monitoring is satisfied, the state of the results in failure of the respective interlock condition to establish a representative point of contact with a different controller, they are the second, third, and even if this results in failure in the n-th, the interlock diagnosis screen [Faulted] (2 ^nd ), [Faulted] (3 ^rd ),.. For example, from the variable use point information screen which indicates the use point of the corresponding variable by selecting the variable-reference expansion function for the contact name of the interlock incompleteness indicated by the ladder circuit in each column of, for example, Provides the ability to directly deploy and display a program that uses the corresponding interlock condition (D4) in another controller (CONT2).

As a result, the plant operator can extract detailed information about individual variables from the actual program, among a large amount of interlock circuits, and quickly find information about the interlock conditions of the target equipment, and the interlock conditions are not established. It is possible to provide an apparatus for quickly performing a cause cause investigation.

As a result, the plant operator can expand the scope of the monitoring target and improve the operability of the monitoring function, so that detailed information on individual variables can be obtained from the actual program, even among a large amount of interlock circuits in a large plant. In addition, regardless of the construction status of the interlock contact point interfaced between the plurality of controllers, the interlock condition can be quickly found, and information on the interlock condition of the target equipment can be quickly found, thereby interlocking. Provided is a device capable of quickly performing a cause investigation in which a condition is not established.

Example 9

Fig. 6 shows Embodiment 9 of the present invention, that is, an HMI screen and an interlock diagnosis screen.

In Example 1, the interlock condition which an arbitrary controller uses in the some controller (CONT1, CONT2, CONT3, ..., CONTn) connected to the network as a plant control means in the interlock diagnosis screen [Live] column of FIG. Even when the other controller is interfaced as a representative contact, as the one of the source factor contacts of the interlock failure in any controller by monitoring the state of the establishment or failure of the individual interlock conditions for establishing the representative contact in the other controller, It is displayed on the computer COMP of the control program creation / display means.

On the other hand, in Example 9, the function of Example 1 is performed by general operator operation and display apparatus HMI. Since the operator operation display device HMI includes the interlock diagnosis means 20 equivalent to that provided in the computer COMP, it has a display function of the interlock diagnosis screen shown in FIG.

Then, the interlock diagnosis means 20 of the operator operation / display device HMI is connected to the computer COMP via the LAN so that the interlock diagnosis means 20 of the computer COMP refers to the logical file of the database unit 30. In order to refer to the interlock condition, that is, the list of coil variables, stored as a logical file of the database unit 30 of the database unit 30, on the plant operation / monitoring screen, a list of circuit names of the interlock diagnosis target and an interlock diagnosis screen selected therefrom are displayed. I can display it.

Fig. 6 shows a circuit name list screen for an interlock diagnosis object on a plant operation / monitoring screen used by a driver for operating and monitoring a plant in a general operator operation / display device (HMI) operated by a driver in a plant cab. In this case, an example of selecting an incomplete interlock circuit and displaying a corresponding interlock diagnosis screen is shown.

Accordingly, as shown in FIG. 6, in the general operator operation / display device (HMI) operated by the driver, in addition to the example of the plant operation / monitoring screen by the operator operation / monitoring means, the interlock diagnosis by the interlock diagnosis means Since it has the function of displaying the target circuit list and the interlock diagnosis screen, the plant operator does not need to operate the computer (COMP) that the system programmer uses when designing the program, and also does not have the support of the system programmer. Only the operator operation and display device (HMI) used by the plant operator himself can monitor the status of the interlock failure.

In addition, even if the screen program of the screen for interlock monitoring which was prepared exclusively as an operator operation / monitoring means becomes unnecessary, and even if an interlock change or addition deletion occurs due to the remodeling of the equipment, the screen of the operator operation / monitoring means The latest interlock status can always be displayed without any modifications to the program.

Example 10

Fig. 6 shows a tenth embodiment of the present invention, that is, an HMI screen and an interlock diagnosis screen.

In Embodiment 2, in the interlock diagnosis screen [Faulted] column at the bottom of Fig. 3, the interlock condition used by any controller in the plurality of controllers CONT1, CONT2, CONT3, ..., CONTn connected to the network as the plant control means. Even when the other controller is interfaced as the representative contact, the status of the establishment and failure of the individual interlock conditions for establishing the representative contact in the other controller is also monitored to track the output source of the interlock condition, and the first contact is not established. That is, the contact which used as the trigger (1st cause) of an interlock failure is represented by the ladder circuit.

On the other hand, in Example 10, similarly to Example 9, the functions of Example 2 are performed by the general operator operation and display device HMI.

Accordingly, the plant operator does not need to operate the computer (COMP) used by the system programmer in the design of the program, and even without the support of the system programmer, the operator operator and display device (HMI) used by the plant operator himself / herself. Since the range of the interlock non-monitoring object is expanded and the operability of the monitoring function is improved, the interlock condition of the target equipment regardless of the construction situation of the interlock contact point interfaced between a plurality of controllers in a large plant. With respect to this, it is possible to provide an apparatus for quickly finding an interlock condition that has not been established initially.

Example 11

Fig. 7 shows an eleventh embodiment of the present invention, i.e., its interlock diagnosis screen and its operation method.

In the third embodiment, even when the interlock conditions used by any controller are interfaced as representative contacts from other controllers in the plurality of controllers CONT1, CONT2, CONT3, ..., CONTn connected to the network as the plant control means, Since the status of the establishment or failure of the individual interlock conditions for establishing a representative contact in another controller is also monitored, the current name of the contact of the current interlock failure displayed in the [Interlock] diagnostic screen or the [Faulted] column is displayed. Select the variable property information (Device Property) expansion function for the contact name of the latest interlock failure, and expand and display the variable detail information screen of the corresponding variable, and also use the cross-reference expansion function. Select to expand and display the variable use point information screen of the corresponding variable.

On the other hand, in the eleventh embodiment, similarly to the ninth embodiment, the functions of the third embodiment are performed by general operator operation and display device HMI.

Therefore, the plant operator does not need to operate the computer (COMP) that the system programmer uses when designing the program, and does not need the support of the system programmer, and only the operator operation / display device (HMI) that the plant operator uses everyday. In addition, among a large amount of interlock circuits, detailed information on individual variables can be collected, information on interlock conditions of the target equipment can be quickly found, and the cause of the interlock condition not being established can be quickly performed. A device can be provided.

Example 12

Fig. 7 shows a twelfth embodiment of the present invention, that is, an interlock diagnosis screen and an operation method thereof.

In the fourth embodiment, even when the interlock conditions used by any controller are interfaced as representative contacts from other controllers in the plurality of controllers CONT1, CONT2, CONT3, ..., CONTn connected to the network as the plant control means, Variable interlock condition (D4) is used in another controller (CONT2), for example, from the variable use point information screen indicating the cross-reference expansion function and indicating the point of use of the corresponding variable. Program is directly deployed and displayed.

In contrast, in the twelfth embodiment, similarly to the ninth embodiment, the functions of the fourth embodiment are performed by the general operator operation and display device HMI.

Accordingly, the plant operator does not need to operate the computer (COMP) used by the system programmer in the design of the program, and even without the support of the system programmer, the operator operator and display device (HMI) used by the plant operator himself / herself. Only in a large amount of interlock circuits, detailed information on individual variables can be collected from actual programs, and information on interlock conditions of the target equipment can be found quickly to find the cause of the interlock condition being incomplete. It is possible to provide an apparatus capable of performing the operation quickly.

Example 13

Fig. 8 shows Embodiment 13 of the present invention, that is, the HMI screen and the interlock diagnosis screen.

In the fifth embodiment, in the [Live] column of the interlock diagnosis screen of Fig. 5, when the corresponding interlock condition is not satisfied at the present time, an interlock diagram of only the contact point, which is the cause thereof, is displayed by a ladder circuit, and the latest among these interlock conditions is displayed. In [Faulted] (1 ^st ), the contact that is the trigger (first cause) of interlock failure is indicated by the ladder circuit, and the second, third, and nth failed contact is indicated by the ladder circuit. ] (2 ^nd ), [Faulted] (3 ^rd ),.. We display in each column of.

On the other hand, in the thirteenth embodiment, similarly to the ninth embodiment, the functions of the fifth embodiment are performed by the general operator operation and display device HMI.

Accordingly, the plant operator does not need to operate the computer (COMP) used by the system programmer in the design of the program, and even without the support of the system programmer, the operator operator and display device (HMI) used by the plant operator himself / herself. Only by expanding the scope of the monitoring target and improving the operability of the monitoring function, not only the interlock condition that was initially established for the interlock condition of the target equipment in a large plant, but also a plurality of interlock conditions were not established. It is possible to provide a device for quickly finding a process to be completed.

Example 14

8 shows a fourteenth embodiment of the present invention, that is, an HMI screen and an interlock diagnosis screen.

In the sixth embodiment, the interlock diagnosis screen [Faulted] (2 ^nd ), [Faulted] (3 ^rd ),. In each of the fields, even when the interlock conditions used by any controller are interfaced as representative contacts from other controllers in a plurality of controllers (CONT1, CONT2, CONT3, ..., CONTn) connected to the network as the plant control means, The output source of this interlock condition is traced, and the 2nd, 3rd, and nth failed contact points are displayed by the ladder circuit.

On the contrary, in the fourteenth embodiment, similarly to the thirteenth embodiment, the functions of the sixth embodiment are performed by a general operator operation and display device HMI.

Accordingly, the plant operator does not need to operate the computer (COMP) used by the system programmer in the design of the program, and even without the support of the system programmer, the operator operator and display device (HMI) used by the plant operator himself / herself. Only the scope of the monitoring object is expanded and the operability of the monitoring function is improved. Therefore, regardless of the construction status of the interlock contact point interfaced between a plurality of controllers in a large-scale plant, In addition to the first interlock condition that has not been established, it is possible to provide an apparatus for quickly finding a plurality of interlock conditions in the process of becoming non-established.

Example 15

8 shows a fifteenth embodiment of the present invention, that is, an HMI screen and an interlock diagnosis screen.

In the seventh embodiment, in the case where a plurality of controllers (CONT1, CONT2, CONT3, ..., CONTn) connected to the network as the plant control means, the interlock condition used by any controller is interfaced as a representative contact from another controller, Since the statuses of the establishment and failure of the individual interlock conditions for establishing the representative contact point in other controllers are also monitored, the interlock diagnosis screen [Faulted] (Fig. 5) can be used even when these are the second, third, and nth failures. 2 ^nd ), [Faulted] (3 ^rd ),.. Select the variable property information (Device Property) expansion function for the contact name of the interlock failure established by the ladder circuit in each column of the column to expand and display the variable detail information screen of the corresponding variable, and also display the variable use point information ( Cross-reference) function is selected and the variable use point information screen of the corresponding variable is developed and displayed.

Accordingly, the plant operator does not need to operate the computer (COMP) used by the system programmer in the design of the program, and even without the support of the system programmer, the operator operator and display device (HMI) used by the plant operator himself / herself. Only by expanding the scope of the monitoring target and improving the operability of the monitoring function, it is possible to extract detailed information on individual variables among a large amount of interlock circuits in a large-scale plant, Regardless of the construction status of the interlock contact that is interfaced, the interlock condition is not established because the information on the interlock condition of the target equipment is quickly found while quickly finding a process in which a plurality of interlock conditions become incomplete. It can provide a device to quickly perform cause lifesaving. have.

Example 16

8 shows Embodiment 16 of the present invention, that is, an HMI screen and an interlock diagnosis screen.

In the eighth embodiment, in the case where a plurality of controllers (CONT1, CONT2, CONT3, ..., CONTn) connected to the network as the plant control means, the interlock condition used by any controller is interfaced as a representative contact from another controller, The other controller also monitors the status of the establishment and failure of the individual interlock conditions for establishing the representative contact, so that even if they become the 2nd, 3rd, and nth failures, the interlock diagnosis screen [Faulted] (2 ^nd ) , [Faulted] (3 ^rd ),.. For example, from the variable use point information screen which indicates the use point of the corresponding variable by selecting the variable-reference expansion function for the name of the interlock non-contact point indicated by the ladder circuit in each column of, for example, The other controller CONT2 directly expands and displays the program using the interlock condition D4.

As a result, the plant operator can extract detailed information about individual variables from the actual program, among a large amount of interlock circuits, and quickly find information about the interlock conditions of the target equipment, and the interlock conditions are not established. It is possible to provide an apparatus for quickly performing a cause cause investigation.

And the plant operator does not need to operate the computer (COMP) that the system programmer uses at the time of designing the program, and even without the support of the system programmer, the plant operator can use only the operator operation and display device (HMI) that the plant operator usually uses. Since the scope of the monitoring target is expanded and the operability of the monitoring function is improved, detailed information about individual variables can be obtained from the actual program even in a large amount of interlock circuits in a large plant. Regardless of the construction status of the interlock contact that is interfaced between the controllers of the controllers, the interlock condition can be quickly found, and information on the interlock conditions of the target equipment can be found quickly. It is possible to quickly identify the cause of the failure. There can be provided a device.

As described above, even if the interlock condition used by any plant control means is interfaced as a representative contact point from another plant control means connected to the network, the individual interlocks for establishing the representative contact point in the other plant control means. The condition of the establishment or failure of the condition is also monitored, and the individual interlock conditions from other plant control means are also displayed on the interlock diagnosis screen as one of the source factors of non-establishment, and even if multiple stages of interlock circuits are formed, the source of the failure is not established. Not only the first unestablished contact among the factors, but also the second, third,... Since the n-th unsuccessful contact is also detected and displayed on the interlock diagnosis screen, information on the interlock condition of the target equipment can be found quickly in a large plant.

Claims (16)

Control program editing means for creating a control program including an interlock condition and an diagnosis of the interlock; A plurality of plant control means for executing a program object by the control program; It has a logic operation part and a display part, and it updates and displays the establishment and failure of the latest interlock condition of the past by arbitrary plant control means, and even if the interlocking circuit is formed in multiple stages, only the origin of the source of a factor which does not exist is specified. In addition to the function of automatically displaying an interlock diagnosis screen using a schematic language, the interlock condition used by an arbitrary plant control means may be different from the other plant control means connected to the network as a representative contact point. By monitoring the status of the establishment and failure of the individual interlock conditions for establishing the representative contact point in the plant control means, the individual interlock conditions in the other plant control means are also displayed on the interlock diagnosis screen as one of the source factors of the contact points that are not established. Plant control system with interlock diagnostic means having a function. The method of claim 1, The interlock diagnostic means, Even when the interlock condition used by any plant control means is interfaced as a representative contact point from other plant control means connected to the network, the state of establishment or incomplete of individual interlock conditions for establishing a representative contact point in another plant control means And monitoring the plant, including the respective interlock conditions in the other plant control means, and detecting the first unsuccessful contact point and displaying the interlock diagnosis screen. The method of claim 1, The interlock diagnostic means, Even when the interlock condition used by any plant control means is interfaced as a representative contact point from other plant control means connected to the network, the state of establishment or incomplete of individual interlock conditions for establishing a representative contact point in another plant control means By monitoring, the individual interlock conditions in the other plant control means are also one of the unsuccessful source factor contacts, and the detailed information is presented, and the program points in which the unsettled source factor contacts are used in other plant control means are monitored. Plant control system having a function to present. The method of claim 1, The interlock diagnostic means, Even when the interlock condition used by any plant control means is interfaced as a representative contact point from other plant control means connected to the network, the state of establishment or incomplete of individual interlock conditions for establishing a representative contact point in another plant control means By monitoring, the plant control system, characterized in that the individual interlock condition in the other plant control means is also one of the source factor contact points, which has a function of directly displaying the corresponding program being used among the other plant control means. The method of claim 1, The interlock diagnostic means, Even if the interlock circuit is formed in multiple stages, only the non-existent source factor contact is identified, and the function of detecting the first non-established contact and displaying it on the interlock diagnosis screen is added. and a function of detecting an n-th unsuccessful contact point and displaying it on the interlock diagnosis screen. The method of claim 5, The interlock diagnostic means, Even when the interlock condition used by any plant control means is interfaced as a representative contact point from other plant control means connected to the network, the state of establishment or incomplete of individual interlock conditions for establishing a representative contact point in another plant control means By monitoring, the individual interlock conditions in other plant control means are also 2nd, 3rd,... and a function for displaying on the interlock diagnosis screen as a detection target contact point when the nth time is not established. The method of claim 6, The interlock diagnosis means establishes an individual interlock condition for establishing a representative contact in the other plant control means even when the interlock condition used by the plant control means is interfaced as a representative contact from other plant control means connected to the network. By monitoring the status of non-establishment, the respective interlock conditions in the other plant control means are second, third,... , when the nth is not established and displayed on the interlock diagnosis screen, the second, third,... , by the display function of the source factor contact point indicating that the nth non-establishment is present, the detailed information is directly presented, and the non-established source factor contact has a function of presenting a program point used in another plant control means. Characterized by a plant control system. The method of claim 6, The interlock diagnostic means, Even when the interlock condition used by any plant control means is interfaced as a representative contact point from other plant control means connected to the network, the state of establishment or incomplete of individual interlock conditions for establishing a representative contact point in another plant control means By monitoring, the respective interlock conditions in the other plant control means are second, third,... , when the nth is not established and displayed on the interlock diagnosis screen, the second, third,... and a function of directly displaying the program being used among other plant control means by the display function of the source factor contact which indicates that the nth establishment is not achieved. The method of claim 1, In a plant cab, on the general operator operation and display apparatus operated by a plant driver, it has the function of the said interlock diagnostic means, and is provided with the operator operation and monitoring means which has a function which displays the said interlock diagnosis screen, Even when the interlock condition used by any plant control means is interfaced as a representative contact point from other plant control means connected to the network, the state of establishment or incomplete of individual interlock conditions for establishing a representative contact point in another plant control means By monitoring, the plant control system which has a function which displays the said interlock diagnosis screen on the screen of the said operator operation display apparatus as one of the source factor contacts which individual interlock conditions in another plant control means also have not established. . The method of claim 9, The operator operation and monitoring means, Even when the interlock condition used by any plant control means is interfaced as a representative contact point from other plant control means connected to the network, the state of establishment or incomplete of individual interlock conditions for establishing a representative contact point in another plant control means By monitoring, it has a function which detects the contact which was initially unestablished, including the individual interlock conditions in other plant control means, and displays the said interlock diagnostic screen on the screen of the said operator operation display apparatus. It is characterized by the above-mentioned. Plant control system. The method of claim 9, The operator operation and monitoring means, Even when the interlock condition used by any plant control means is interfaced as a representative contact point from other plant control means connected to the network, the state of establishment or incomplete of individual interlock conditions for establishing a representative contact point in another plant control means By monitoring, the individual interlock condition in other plant control means is also one of the source factor contact points which are not established, and the detailed information and the program points used by other plant control means which have not established the source factor contact point are described above. A plant control system having a function of presenting on a screen of a display device. The method of claim 9, The operator operation and monitoring means, Even when the interlock condition used by any plant control means is interfaced as a representative contact point from other plant control means connected to the network, the state of establishment or incomplete of individual interlock conditions for establishing a representative contact point in another plant control means By monitoring, the respective interlock condition in the other plant control means is also one of the source factor contact points which do not exist, and the contact is used to directly display the corresponding program being used in the other plant control means on the screen of the operator operation / display device. Plant control system characterized in that it has a function. The method of claim 9, The operator operation and monitoring means, Even if a plurality of stages of interlock circuits are formed, only the non-existing source factor contacts are identified, the first non-established contact is detected, and the interlock diagnosis screen is added to a function of displaying on the screen of the operator operation / display device. Second, third,… and a function of detecting the n-th unsuccessful contact point and displaying the interlock diagnosis screen on the screen of the operator operation / display device. The method of claim 13, The operator operation and monitoring means, Even when the interlock condition used by any plant control means is interfaced as a representative contact point from other plant control means connected to the network, the state of establishment or incomplete of individual interlock conditions for establishing a representative contact point in another plant control means By monitoring, the individual interlock conditions in other plant control means are also 2nd, 3rd,... and a function of displaying the interlock diagnosis screen on the screen of the operator's operation / display device as the detection target contact point when the nth time is not established. The method of claim 14, The operator operation and monitoring means, Even when the interlock condition used by any plant control means is interfaced as a representative contact point from other plant control means connected to the network, the state of establishment or incomplete of individual interlock conditions for establishing a representative contact point in another plant control means By monitoring, the respective interlock conditions in the other plant control means are second, third,... , when the nth is not established and displayed on the interlock diagnosis screen, the second, third,... By the display function of the source factor contact point indicating that the nth non-establishment is established, the program information used by the plant control means for which the detailed information and the non-established source factor contact point are different is displayed on the screen of the operator operation / display device. Plant control system, characterized in that it has a function to present on. The method of claim 14, The operator operation and monitoring means, Even when the interlock condition used by any plant control means is interfaced as a representative contact point from other plant control means connected to the network, the state of establishment or incomplete of individual interlock conditions for establishing a representative contact point in another plant control means By monitoring, the respective interlock conditions in the other plant control means are second, third,... , when the nth is not established and displayed on the interlock diagnosis screen, the second, third,... , by the display function of the source factor contact point indicating that the nth is not established, the contact point has a function of directly displaying the program being used among other plant control means on the screen of the operator operation / display device. Characterized by a plant control system.

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