JPH11282523A - Plant system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a plant system for checking the opening degree of a valve in maintenance and check. SOLUTION: This plant system 1 is provided with a plant operation control LAN(local area network) 6, instrumentation facility checking LAN 7, and portable information terminal 12 capable of bi-directional information communication with the instrumentation facility checking LAN 7. Also, the connecting part of the plant operation control LAN 6 with the instrumentation facility checking LAN 7 is provided with a gateway sever 30. Then, the gateway server 30 is provided with a state monitor information obtaining means 35 for obtaining the state monitor information of each instrumentation facility from a process computer 8. A specific controller 3 can be controlled according to an operation control command from the portable information terminal 12 to the specific controller 3, and the state monitor information of a specific instrumentation facility 4 can be outputted to the portable information terminal 12 by the state monitor information obtaining means 35 according to a monitor command from the portable information terminal 12 to the specific instrumentation facility 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant system for maintaining and inspecting instrumentation equipment provided in a plant, such as a gas production plant, while operating continuously.

[0002]

2. Description of the Related Art The above-described gas production plant will be described by way of example. The plant is in an operating state at all times, and a so-called LAN (Local Area Network) for controlling plant operation is constructed in order to perform this operation suitably. Have been. That is, as shown in FIG. 1, a main computer 8b for controlling plant operation and a plurality of main computers connected to the main computer 8b for controlling plant operation and provided in correspondence with a plurality of instrumentation facilities provided in various parts of the plant. A so-called LAN is constructed between the field computer 8a and each instrumentation facility managed by the computer 8a. Here, the plant operation control main computer 8a and the field computer 8b are collectively referred to as a process computer. As such an instrumentation facility, a control device provided for a controlled system of a plant (for example, a valve 3 for controlling a flow rate when the controlled object is a fluid flowing in a plant pipe) or a measuring tool ( For example, a limit switch 4 attached to the valve 3 and a pressure gauge 5 when the controlled object is the pressure of a fluid flowing in the plant piping can be exemplified. Therefore, regarding the operation of the plant, a desired good operation state can be maintained in the plant operation control LAN. In general, a so-called production team is responsible for operating such a plant.

On the other hand, each instrumentation requires regular maintenance and inspection. Here, such maintenance and inspection is performed by a maintenance and inspection team different from the production team described above. A typical work of such maintenance and inspection is a so-called loop check. In such a loop check, for example, the monitoring area of the measuring tool is set to a simulated physical state, and the output from the measuring tool is checked. Then, the relation with the simulated amount given truly is examined, and the operation of this measuring tool is confirmed. In such confirmation work, there is a sequence established for individual instrumentation equipment, but as a practical matter, there are a very large number of instrumentation equipment to be checked, and the work place, time, and personnel In order to make it different, a system that handles this in a unified manner is being constructed. That is, an instrumentation equipment inspection LAN is provided separately from the plant operation control LAN, and the instrumentation equipment inspection main computer 10 provided in this LAN is provided with the above sequence, the previous inspection result, and the failure diagnosis. A system and the like are provided, and at the time of inspection of each instrumentation facility, information corresponding to each instrumentation facility is called, and maintenance and inspection work is performed rationally and promptly. Also,
Since the measuring instruments are scattered in various places, for example, a loop check device 14 is attached to each measuring instrument, and a portable information terminal 12 connectable to the loop check device 14 and a communication unit of the portable information terminal 12 are provided. The inventors have proposed to construct a system by providing a LAN for inspection of instrumentation equipment capable of transmitting information two-way.

[0004]

The work performed by maintenance and inspection workers is an example of instrumentation equipment.
There are operations for measuring the opening degree of the limit switch associated with the opening / closing operation of the valve, which is a so-called control device, measuring the opening / closing time of the valve, and confirming the trip operation time in a situation where a trip command is issued. Such an operation has conventionally been performed in the following procedure. (1) Limit switch operating point confirmation work Open the valve little by little from the central control room, monitor the operation status of the limit switch in the central control room, and check the valve opening scale on site at the same time. Check the valve opening at which the limit switch operates.

(2) Valve opening / closing time measurement operation The valve is opened / closed from the site or the central control room, and the operation time of the operation of the limit switch is measured at the site using a stopwatch.

(3) Trip operation time measurement work A trip command is issued from the central control room, and the trip time of the valve (for example, the time during which the limit switch works) is measured on site.

[0007] Following the above-described work procedure, the work can be performed only by the workers at the site, and the work becomes complicated. Therefore, an object of the present invention is to provide a portable information terminal used with a device capable of appropriately coping with such a problem and capable of performing a loop check that has been established so far for the above purpose. It is to propose a system that can do it.

[0008]

In order to achieve the above object, there are provided a plurality of field computers for an instrumentation facility including a control device, and a main computer for the field computer. , A plant operation control LAN that performs two-way communication of information including operation control commands
The configuration of a plant system including a portable information terminal and an instrumentation equipment inspection LAN capable of two-way information communication with a communication unit of the portable information terminal is as follows. A connection section between the plant operation control LAN and the instrumentation equipment inspection LAN is provided with a gateway server, and the gateway server is provided with status monitoring information acquisition means for obtaining status monitoring information of each of the instrumentation facilities, In response to a control command from the portable information terminal to the specific control device, the specific control device is configured to be capable of controlled operation via the instrumentation equipment inspection LAN, the gateway server, and the plant operation control LAN in the stated order. A monitoring command from the portable information terminal to a specific instrumentation facility, wherein the gateway server outputs the status monitoring information of the specific instrumentation facility obtained by the status monitoring information acquisition means to the portable information terminal. Configuration.

In this configuration, in response to an operation control command of a specific control device from a portable information terminal, an instrumentation equipment inspection LAN, a gateway server, and a plant operation control L
The specific control device is configured to be controlled and operable via the AN in the order described. That is, for example, from the portable information terminal, the contents of the operation control command storage unit of the field computer provided for the specific control device can be rewritten, and by changing the contents in this way, The operation control status of the specific control device can be changed. More specifically,
For example, when the specific control device is a valve, this valve can be operated to open or close. On the other hand, a connection section between the plant operation control LAN and the instrumentation equipment inspection LAN is provided with a gateway server, and the gateway server is provided with status monitoring information acquisition means for obtaining status monitoring information of each instrumentation facility. ing. That is, the status monitoring information acquisition means includes, for example,
The opening information of the valve, the operation information of the limit switch (information such as whether the limit switch is in the ON state or the OFF state, etc.), and the next operation or command from the time when the predetermined operation or command is generated Time information until the occurrence occurs, etc., is obtained as state monitoring information. The operator writes the tag No. of the specific control device to be operation-controlled on the portable information terminal. Enter Further, for example, the operation control content required for the specific control device is also input by designating the tag No. When the specific control device is a valve to be controlled among a plurality of valves, the tag No. of the controlled valve is used. And the tag No. corresponding to the operation control command required for the controlled valve. (For example, the tag number of the open pattern). On the other hand, at the same time, the tag No. of the instrumentation equipment (this is the specific instrumentation equipment) to be monitored for the movement of the specific control equipment. Enter That is, the instrumentation equipment to be monitored for the movement of the specific control device is specified. Therefore, in this configuration, when the instrumentation equipment to be monitored is specified, the status monitoring information of the specific instrumentation equipment to be monitored is obtained by the status monitoring information acquisition means provided in the gateway server. Can be Such status monitoring information of the specific instrumentation equipment is configured to be output to the portable information terminal via the gateway server. result,
The portable information terminal at the site can obtain its own status monitoring information or the status monitoring information of other instrumentation equipment while operating and controlling the specific control device. Inspection work of the equipment provided for can be performed.

As described above, the target of such inspection work is measurement of the opening degree when the limit switch is operated, measurement of the opening / closing time of the valve, and further, a trip command, as described above. Although there is a trip operation time in the situation, etc., when the inspection work is targeted, predetermined information can be obtained by constructing the system as follows. That is, the specific control device is a valve provided in the pipe and controlled to open and close, and the state monitoring information of the monitoring command is the opening degree information of the valve and the limit operation information of the limit switch attached to the valve. In some cases, both the opening information of the valve and the operation information of the limit switch can be obtained by a portable information terminal to know the opening at which the limit switch operates.

On the other hand, the specific control device is a valve provided in the pipe and controlled to open and close, and the status monitoring information of the monitoring command is provided by the limit operation information of the limit switch attached to the valve and the operation of the valve. If the information is the time information from the start to the time when the limit switch is operated, the opening and closing time of the valve can be obtained by the portable information terminal.

[0012] Further, a specific control device is a valve provided on the pipe and controlled to open and close, and the status monitoring information of the monitoring command is provided by a limit switch of a limit switch attached to the valve from the time when the trip operation command is issued to the valve. In the case of the time information up to the operation time, a so-called trip time can be obtained by the portable information terminal.

An instrumentation equipment inspection LAN is provided with an instrumentation equipment inspection main computer, and the instrumentation equipment inspection main computer stores opening / closing pattern information for each valve as a control device. And
It is preferable that a controlled operation based on the opening / closing pattern information corresponding to the specific valve is performed in response to an operation control command for the specific valve from the portable information terminal. Many valves and the like are provided in the plant, and their types, sizes, uses, and the like are different from each other. Therefore,
Opening / closing pattern information suitable for each valve is stored in the instrumentation equipment inspection main computer, this pattern is called from the portable information terminal, and the controlled operation of the valve is performed in accordance with this pattern, whereby each valve is controlled. Necessary information in an appropriate opening / closing pattern suitable for the valve can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a plant system 1 according to the present invention will be described. This plant system 1
For example, an LNG vaporization plant or the like can be mentioned. The plant is provided with a plurality of pipes 2 through which a plurality of types of gases flow. The pipe 2 is provided with a valve 3 for controlling the pressure of the gas flowing in the pipe, a limit switch 4 for the valve 3, and a pressure gauge 5 on the lower side of the valve 3 for measuring the pressure of the gas flowing in the pipe. And other measuring instruments. That is, in this plant, the gas is the controlled object, and the valve 3 is an example of a control device. Here, for each system of the plant, such as the valve 3, the limit switch 4, and the pressure gauge 5, a control device for controlling a state amount in the system and a measuring instrument for measuring the state amount are provided. Collectively, it is called instrumentation equipment.

As shown in FIG. 1, the plant system 1 is provided with two types of LANs: a plant operation control LAN 6 and an instrumentation equipment inspection LAN 7. Here, the instrumentation equipment inspection LAN 7 is associated with mobile communication by PHS, and thus can be regarded as a PHS-LAN.

The plant operation control LAN 6 is provided with process computers 8 for the plurality of instrumentation facilities, and is configured to perform two-way communication of information including operation control commands within the LAN. To this end, the process computer 8 includes a field computer 8a provided for each instrumentation facility,
And a main computer 8b for controlling plant operation, which plays a general role in the inside. The field computer 8a is configured to be capable of bidirectional communication with a control device (for example, a valve 3) and a measuring device (for example, a limit switch 4 and a pressure gauge 5) provided in the instrumentation facility. The control device is configured to be moved in accordance with the following so as to be suitable for a predetermined purpose. Further, the plant operation control main computer 8b assigns a target value or the like suitable for the operation state to each field computer 8a,
It is constructed so that the operation of the plant can be maintained in a desired state as a whole.

Next, the instrumentation equipment inspection LAN 7 will be described. The instrumentation equipment inspection LAN 7 is constructed so as to perform a so-called loop check. As shown in FIG. 1, a main computer 10 for instrumentation equipment inspection connected to a LAN 7 for instrumentation equipment inspection constructed on the center 9 side, and a loop check distributed to each site on the plant equipment side. A portable information terminal (for example, PDA = Personal Digi
PH between tal Assistance and handy PC) 12
The connection can be made via the S line 13 so that bidirectional communication is possible.

The loop check point 11 is a place where a pressure gauge 5 for measuring a physical quantity of a controlled body which is a fluid flowing inside the pipe 2 or the like laid on the plant facility side, for example, a pressure, is provided. The portable information terminal 12 is connected to a loop check device 14 attached to the loop check point 11. Loop check device 14
Has an external cylinder 15 as a pressure source, an input connection port 15a thereof, and an output connection port 15b for supplying a pseudo pressure adjusted to a required pressure value to the pressure gauge 5. The pseudo pressure supplied from the loop check device 14 is adjustable. The measurement mode required at each loop checkpoint 11 basically includes three to five reference pressure values,
It is composed of the values, and loop checkpoint 1
Every one is different. In addition, since the total number of loop checks is as many as several thousand, pressure adjustment as a mode setting of the loop check device 14 is controlled by the portable information terminal 12. An electric or optical cable is connected between the portable information terminal 12 and the loop check device 14 by a communication interface to give this control command. The portable information terminal 12 is linked to a unique tag number assigned to each loop check point 11 and has its measurement mode, for example, the first reference pressure value = 0, the second reference pressure value =
2, the third reference pressure value = 4, the fourth reference pressure value = 6, the fifth reference pressure value = 8 (unit: kPa) are read out from the memory card in which are stored, and the pseudo pressure having that pressure value is output. A control signal can be sent to the loop check device 14 so as to be output from the port 15b.

A PHS terminal 16 functioning as a communication unit of the portable information terminal 12 is carried by a maintenance and inspection worker. During the loop check operation, the PHS terminal 16 connects to the PHS line 1
3 and a bidirectional data communication state by connecting to the base station 19, and a connection state with the portable information terminal 12 via an infrared interface (for example, IrDA interface).

The instrumentation equipment inspection LAN 7 includes an instrumentation equipment inspection main computer 10 and is further connected to a PHS controller 18 via a router 17. The PHS control device 18 is connected to a base station 19 constituting the PHS line 13 via a private digital line 20, and
It is also connected to the private branch exchange 21. That is, PH
If the signal transmitted from the PHS terminal 16 via the base station 19 and the private digital line 20 is telephone voice, the S control device 18 switches to the private telephone exchange 21 if the transmitted signal is data communication. LAN for instrumentation equipment inspection
Switch to 7. In any case, the signal sent from the private branch exchange 21 or the instrumentation equipment inspection LAN 7 is sent to the destination PHS terminal 16 via the base station 19. Since the service area of the base station 19 is several hundred meters, the base stations 19 are distributed so as to cover all the loop check points 11. Since the private branch exchange 21 is connected to the public line and the company telephone network, the PHS terminal 16 can also make a call with an outside line telephone or a company telephone.

Therefore, according to the above configuration, when the pseudo pressure set to the reference pressure value is supplied from the loop check device 14 to the loop check point 11, the pressure gauge 5 measures the pseudo pressure, and the measuring instrument (pressure gauge) 5) Return to the portable information terminal 12 via the field computer 8a, the plant operation control LAN 6, and the instrumentation equipment inspection LAN 7. By comparing and checking the feedback information with the true pseudo pressure value, a so-called loop check of the measuring instrument can be performed.

On the other hand, the instrumentation equipment inspection LAN 7 is provided with an instrumentation equipment inspection main computer 10.
Stores opening / closing speed pattern information for each valve 3, and in response to a specific valve operation control command from the portable information terminal 12, the opening / closing pattern information corresponding to this specific valve can be derived. It has become. The extraction and operation of such information will be described later in detail with reference to the tag No. of the valve 3. Of the opening / closing speed pattern corresponding to the tag No. This can be done by specifying

As described above, when performing maintenance and inspection of the instrumentation equipment, it is necessary to confirm the limit switch operating point, measure the valve opening / closing time, measure the trip operating time, and the like. In such a case, the operating valve 3
It is necessary to perform an operation from the maintenance and inspection side such that the operation of the limit switch 4 provided corresponding to the valve 3 is actively activated by checking the operation time. In such a case, basically, the contents of the operation control command storage unit (not shown) for the specific valve secured in the storage device (not shown) of the field computer 8a are positively changed. Rewriting (specifically, writing) is required.

For this purpose, the plant system 1 of the present application
In the portable information terminal 12, the PHS
It is connected to the instrumentation equipment inspection LAN 7 via the line 13 and is capable of writing operation control commands to the process computer 8 (specifically, the field computer 8a) via the plant operation control LAN 6. Furthermore, a gateway server 30 is connected to the connection between the plant operation control LAN 6 and the instrumentation equipment inspection LAN 7.
And a setting tag unit 31 corresponding to each instrumentation facility is provided in the process computer 8. The setting tag section 31 is configured so that the setting tag section 31 for the corresponding instrumentation facility is in an alternative tag state by an external input. A determination unit 32 is provided for determining whether or not writing from the portable information terminal 12 corresponding to each instrumentation facility to the process computer 8 is possible according to the state of the setting tag unit 31. Is written to the process computer 8 only when it is determined that is possible. In this way,
In response to an operation control command from the portable information terminal 12 to the valve 3 as a specific control device, the instrumentation equipment inspection LAN
7, gateway server 30, plant operation control LA
This valve 3 is configured to be controlled to operate via N6 in the order described. This writing content corresponds to the opening / closing speed pattern taken out by the instrumentation equipment inspection main computer 10 earlier.

Further, the gateway server 30 is provided with status monitoring information acquisition means 35 for obtaining status monitoring information of each instrumentation facility from the process computer 8. For example, the opening information of the valve 3, the limit switch 4
, And further, state monitoring information such as the measurement output of the pressure gauge 5 is obtained. In addition, a configuration is adopted in which the point in time at which the change in the information has occurred is determined, and the elapsed time from a specific point in time to the specific point in time can be determined. Further, in response to a monitoring command for a specific instrumentation facility from the portable information terminal 12, the gateway server 30 transmits the status monitoring information of the specific instrumentation facility obtained by the status monitoring information acquisition unit 35 to the portable information terminal. It is configured to be able to output to the terminal 12. By adopting such a configuration, as described below, using the portable information terminal 12 used for loop check and the like, at the same time, the state monitoring information accompanying the control of the control device is transmitted to the portable information terminal. Obtained on the terminal 12 side.

Hereinafter, individual maintenance and inspection items will be described. (1) Limit switch operating point confirmation work In this case, the specific control device is the valve 3 provided in the pipe 2 and controlled to open and close, and the state monitoring information of the monitoring command is
The opening degree information of the valve 3 and the limit operation information of the limit switch 4 provided in association with the valve 3 are shown.

The operation procedure will be specifically described below. B. The portable information terminal 12 displays the valve tag No. to be inspected.
And the opening / closing speed pattern of the valve 3 is downloaded from the instrumentation equipment inspection main computer 10 which also functions as a central database provided in the instrumentation equipment inspection LAN 7. (B) A limit switch check start command is input to the portable information terminal 12. C. In the gateway server 30, the valve tag No. , Limit switch tag No. , Opening / closing speed pattern No. Is transmitted from the portable information terminal 12. D. The gateway server 30 determines the opening / closing speed pattern No.
, The process computer 8 is instructed to set the valve opening. The gateway server 30 simultaneously starts the status monitoring of the valve 3 and the limit switch 4 (the status monitoring information acquisition means 35 monitors the opening information of the valve 3 and the operation information of the limit switch 4), and after the opening setting command. The valve opening when the state of the limit switch 4 changes is stored in a memory. Reverse operation (ON to OFF when OFF to ON) is measured in the same manner. E. Only the opening of the valve 3 when the limit switch 4 is operated is transmitted from the gateway server 30 to the portable information terminal 12. Thus, when a start command is given to the portable information terminal 12 at the site, the valve 3 is automatically opened and closed, and the opening degree at which the limit switch 4 has been operated can be known by the portable information terminal 12. In this case, the opening / closing time varies depending on the size of the valve 3. Therefore, if all the valves 3 are measured at a constant opening / closing speed, it takes time for a large valve 3. Further, unless the opening / closing speed is reduced near the limit switch 4 operating point, accurate measurement of the limit switch operating point cannot be performed. Therefore, in the system of the present invention, several opening / closing speed patterns are prepared for each valve 3, the pattern is changed for each valve, and the opening / closing speed is reduced immediately before the expected limit switch operation point. This enables accurate measurement of the opening of the valve on which the limit switch 4 operates.

(2) Measurement of valve opening / closing time In this case, the specific control device is the valve 3 provided in the pipe 2 and controlled to open and close, and the status monitoring information of the monitoring command is provided by the limit switch provided with the valve 3. 4 and time information from the time when the valve 3 starts operating to the time when the limit switch 4 operates. B. The portable information terminal 12 displays the valve tag No. to be inspected.
And the opening / closing speed pattern of the valve 3 is downloaded from the instrumentation equipment inspection main computer 10 which also functions as a central database provided in the instrumentation equipment inspection LAN 7. (B) A valve operation time measurement start command is input to the portable information terminal 12. C. In the gateway server 30, the valve tag No. Limit switch tag No. Is transmitted from the portable information terminal 12. (D) The gateway server 30 starts monitoring the state of the limit switch and issues a valve operation command. From that moment, the time until the state of the limit switch changes is measured and monitored. E. Only the valve operation time is transmitted from the gateway server 30 to the portable information terminal 12. As a result, when a start command is given to the portable information terminal 12, the valve 3 automatically opens and closes, and the valve operation time is displayed on the portable information terminal 12.

(3) Trip operation time measurement operation In this case, the specific control device is the valve 3 provided in the pipe 2 and controlled to be opened and closed. 3
Is time information up to the limit operation time of the limit switch 4 provided in association with. In this case, as in the case of the valve operation time measurement, a trip operation command is issued from the portable information terminal 12, the operation target is monitored by the gateway server 30, and the time from the trip command to the operation is automatically measured and monitored. , The measurement time is displayed on the portable information terminal 12.

In the above embodiment, the case where the control device is a valve has been described. However, as such a device, any device can be used as long as it controls the state of a controlled system in a plant. It may be. Furthermore, in the above-described embodiment, an example in which the instrumentation equipment is a valve, a limit switch, or the like has been described. However, it is natural that the instrumentation equipment may be another one corresponding to the control device. It is. In addition, as the state monitoring information, an arbitrary physical quantity can be targeted in addition to the above-described valve opening, the state of the limit switch, the time when the change has occurred, and the like. In the above-described embodiment, the example in which the portable information terminal is used by connecting to the loop check device has been described.
Since the opening degree check of the valve and the like can be performed independently, it is not necessarily required that the valve can be connected to the loop check device.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a plant system according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plant system 3 Valve (instrumentation equipment) 4 Limit switch (instrumentation equipment) 5 Pressure gauge (instrumentation equipment) 6 LAN for plant operation control 7 LAN for instrumentation equipment inspection 8 Process computer 8a Field computer 8b Main computer 12 Mobile Type information terminal 30 gateway server 35 status monitoring information acquisition means

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Takayuki Moriyama 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Katsuyoshi Nakayama 4-chome, Hirano-cho, Chuo-ku, Osaka-shi, Osaka 1-2, Osaka Gas Co., Ltd. (72) Inventor Hajime Morioka 1-2-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Osaka-gaso Co., Ltd. (72) Inventor Motohiro Horio Hirano, Chuo-ku, Osaka, Osaka 1-2-2 Chomachi, Osaka Gas Co., Ltd.

Claims (5)

[Claims] 1. A computer comprising a plurality of field computers for instrumentation equipment including control equipment, and a main computer for the field computer. Two-way communication of information including operation control commands is performed between the field computer and the main computer. A LAN for controlling plant operation to be carried out, comprising a portable information terminal, and a LAN for instrumentation equipment inspection capable of two-way information communication with a communication unit of the portable information terminal.
A plant system provided with a LAN for controlling plant operation and an L for checking instrumentation equipment.
A connection server with an AN is provided with a gateway server, and the gateway server is provided with status monitoring information acquisition means for obtaining status monitoring information of each of the instrumentation facilities. A control command from the portable information terminal to a specific control device is provided. In the instrumentation equipment inspection LAN, the gateway server, and the plant operation control LAN, the specific control device is configured to be operable to be controlled via the described order. A plant system in which the gateway server outputs the status monitoring information of the specific instrumentation equipment obtained by the status monitoring information acquisition means to the portable information terminal in response to a monitoring command. 2. The valve according to claim 1, wherein the specific control device is a valve that is provided in a pipe and is controlled to open and close, and the status monitoring information of the monitoring command includes opening information of the valve and a limit switch provided in association with the valve. 2. The plant system according to claim 1, which is limit operation information. 3. The valve according to claim 1, wherein the specific control device is a valve which is provided in a pipe and which is controlled to open and close, wherein the state monitoring information of the monitoring command includes limit operation information of a limit switch provided with the valve and the valve. 2. The plant system according to claim 1, wherein the information is time information from a time when the operation starts to a time when the limit switch operates. 3. 4. The valve according to claim 1, wherein the specific control device is a valve which is provided in a pipe and which is controlled to open and close, wherein the status monitoring information of the monitoring command is provided in a limit associated with the valve from the time when a trip operation command is issued to the valve. The plant system according to claim 1, wherein the plant information is time information up to a time point when the limit operation of the switch. 5. An instrumentation equipment inspection main computer is provided in the instrumentation equipment inspection LAN, and the opening and closing pattern information for each valve is stored in the instrumentation equipment inspection main computer. The controlled operation based on the opening / closing pattern information corresponding to the specific valve is performed in response to a control command for the specific valve from the portable information terminal.
The plant system according to the paragraph.