WO2015122287A1

WO2015122287A1 - Valve actuator communication system, communication device connection state evaluation method, and program

Info

Publication number: WO2015122287A1
Application number: PCT/JP2015/052494
Authority: WO
Inventors: 森　正和; 福田　真; 大輔久木田
Original assignee: 西部電機株式会社
Priority date: 2014-02-14
Filing date: 2015-01-29
Publication date: 2015-08-20
Also published as: JP6297348B2; JP2015154281A; CN105474583A; CN105474583B; KR102237153B1; KR20160122113A

Abstract

Provided are a valve actuator communication system and the like which, when a plurality of communication devices such as valve actuators are able to communicate with a control device, enable the removal or addition of a communication device while maintaining communication with downstream communication devices even if said devices are connected in series. Two communication paths, a main line formed by a signal line (15) and a standby line formed by a signal line (17), are prepared between a control device (3) and a valve actuator (5). Signal lines that are connected to the valve actuator (5) by connectors can be connected on the upstream side and on the downstream side by the connectors. In the case of removal or addition, a connected state in one line and an unconnected state in the other line are created by the connectors. When detecting these states, the control device (3) determines a state in which removal or addition are possible, and displays this determination on a valve selector.

Description

Valve actuator communication system, communication device connection state evaluation method and program

The present invention relates to a valve actuator communication system, a communication device connection state evaluation method, and a program, and in particular, a valve actuator communication system including a plurality of valve actuators for controlling fluid and a control device communicating with the plurality of valve actuators. About.

The valve actuator controls the fluid by performing an opening / closing operation or the like of the valve. FIG. 5A shows the control device 103 and N (N is a natural number of 2 or more) valve actuators 105 ₁ ,..., 105 _N (subscripts may be omitted in the case of meaning a plurality). It is a figure which shows the outline | summary of the conventional communication system 101 at the time of forming a communication path | route about a series. The control device 103 communicates with the valve actuators 105 and controls operations such as valve opening / closing operations by the valve actuators 105. Here, the series of communication paths, so to speak as a daisy chain, control unit 103, connected to the valve actuator 105 _1, valve actuator 105 _i (i is 2 or more N-1 following a natural number), the valve By connecting to the

actuators

105 _i-1 and 105 _{i + 1} and connecting the valve actuator 105 _N to the valve actuator 105 _N-1 , the control device 103 can communicate with the N valve actuators 105. Means that The upstream side of the valve actuator 105 _i means the control device 103 side in a series communication path. Upstream of the device of the valve actuator 105 _i, the control device 103 and valve actuator 105 _1, ..., a 105 _i-1. The downstream side of the valve actuator 105 _i means a side different from the control device 103 in the series communication path. Downstream of the device of the valve actuator 105 _i, the valve actuator 105 _i + 1, ..., a 105 _N.

Patent Document 1 describes that a hot socket state is identified and an output pin is isolated until the hot socket state is completed. Patent Document 2 describes that a bus disconnection unit corresponding to a plurality of terminal devices temporarily shuts off the bus between the multi-terminal bus and each terminal device. Thus, when a plurality of devices are communicating, etc., when removing one of them, a circuit or the like for disconnection corresponding to each device has been used.

JP 2000-311037 A JP 2000-92097 A

However, when a communication path is formed in series with respect to the control device 103 and the N valve actuators 105 as in the past, if one of the valve actuators 105 is removed, the control device 103 becomes a bubble actuator on the downstream side. It becomes a state where it cannot communicate with. For example, as in FIG. 5 (b), when removal of the valve actuator 105 _i, the control device 103, the valve actuator 105 _i + 1, ..., a situation that can not communicate with the 105 _N. This causes a similar problem when a valve actuator is added. The same problem may occur for a communication system using communication devices having a similar connection relationship.

As disclosed in

Patent Documents

1 and 2, in the communication system as shown in FIG. 5, the control device 103 is located on the downstream side of the isolated valve actuator 105 even if it is isolated corresponding to each valve actuator 105. It does not change in that it becomes a situation where it cannot communicate.

Therefore, in the case where a plurality of communication devices such as valve actuators can communicate with the control device, the present invention maintains the communication state with the communication device on the downstream side even if a series communication path is included. An object of the present invention is to provide a valve actuator communication system or the like that enables removal or addition of a communication device.

A first aspect of the present invention is a valve actuator communication system including a plurality of valve actuators and a control device that communicates with the plurality of valve actuators, wherein each of the valve actuators and the control device includes a first communication path, Communication means is capable of communicating through a plurality of communication paths including a second communication path, and the control device has a determination means for determining whether or not one or a plurality of determination target valve actuators can be removed or added. And the determination means is in a state where the determination target valve actuator and the control device can communicate through one of the first communication path and the second communication path and cannot communicate through the other, and the determination target valve The valve actuator other than the actuator and the control device include the first communication path and If the serial second communication path is in a state capable of communicating, in which it is determined that the determination target valve actuator is ready to be removed or added.

A second aspect of the present invention is the valve actuator communication system according to the first aspect, wherein the first communication path and the second communication path are a series communication path of the control device and the plurality of valve actuators. is there.

A third aspect of the present invention is the valve actuator communication system according to the first or second aspect, wherein the determination target valve actuator includes a plurality of upstream signal line terminals and a plurality of downstreams corresponding to the communication paths. The upstream signal line terminal is connected to an upstream signal line for communicating with the control device, and the downstream signal line terminal is determined by the control device. A terminal to which a downstream signal line for communicating with part or all of the other valve actuator is connected when communication with part or all of the other valve actuator is possible via the target valve actuator. The upstream signal line and the downstream signal line are connected to the upstream signal line terminal and the downstream signal line terminal, respectively. Communication is possible with part or all of the judgment target valve actuator and the other valve actuator, and the upstream signal line terminal and the downstream signal line terminal are connected to the upstream signal line terminal and the downstream signal line terminal, respectively. Is not connected, and the upstream signal line and the downstream signal line are connected without going through the determination target valve actuator, so that the control device cannot communicate with the determination target valve actuator. The valve actuator is in a communicable state.

A fourth aspect of the present invention is the valve actuator communication system according to any one of the first to third aspects, wherein the determination target valve actuator includes a display unit, and the control device controls the display unit. Display control means for displaying a determination result by the determination means, and the display control means determines the determination when the determination means determines that the determination target valve actuator can be removed or added. The display means of the target actuator is made to display that the judgment target valve actuator can be removed or added by the one of the first communication path or the second communication path that can communicate. is there.

A fifth aspect of the present invention is the valve actuator communication system according to any one of the first to fourth aspects, wherein the determination means determines that the determination target valve actuator can be removed. When the determination target valve actuator cannot communicate with the first communication path and the second communication path and can communicate with a valve actuator other than the determination target valve actuator, it is determined that the determination target valve actuator has been removed. Then, after determining that the determination target valve actuator can be added, the determination target valve actuator can communicate with the first communication path and the second communication path, and other than the determination target valve actuator. If communication with the valve actuator is possible, Serial determination target valve actuator is to determined to be added.

A sixth aspect of the present invention is a communication device connection state evaluation method for determining whether or not the configuration of a plurality of communication devices can be changed, wherein the control device that controls the plurality of communication devices and each of the communication devices includes: Recognition capable of communicating through a plurality of communication paths including a first connection path and a second connection path, and recognizing means for recognizing the communication apparatus capable of communicating with the control device through the first communication path and the second communication path The communication device capable of communicating with the control device through one of the first communication path and the second communication route includes one or a plurality of communication devices to be determined, and the control device according to the other The communication device that can communicate with the control device does not include the communication device to be determined, and the communication device that can communicate with the control device through the first communication path and the second communication route is not the communication device to be determined. Are those when the same, including a determination step of determining that the state can be removed or added to the determination target communication device.

A seventh aspect of the present invention is a program for realizing a communication device connection state evaluation method according to a sixth aspect in a computer capable of communicating with a plurality of communication devices.

An eighth aspect of the present invention is an upstream signal line connected to the communication device so that the communication device communicates with the control device, and the control device communicates with another communication device via the communication device. The communication device includes a downstream signal line terminal for connecting a downstream signal line for communicating with the other communication device, and an upstream for connecting the upstream signal line. Side signal line terminals, the downstream signal lines include downstream connection parts for connecting to the downstream signal line terminals, and the upstream signal lines are connected to the upstream signal line terminals. An upstream connection part is provided, and the downstream connection part and the upstream connection part can be connected without going through the communication device.

A ninth aspect of the present invention is a downstream signal line including the downstream connection part according to the eighth aspect.

Note that the present invention may be regarded as a computer-readable recording medium that regularly stores the program of the seventh aspect.

According to each aspect of the present invention, a plurality of communication paths between the control device and the valve actuator or the like are provided, and the determination means is a determination target valve actuator or the like (a valve actuator or the like to be removed or added). If communication is not possible on the communication path, communication is possible on the second communication path, and communication between the other valve actuators and the control device is possible on the first communication path and the second communication path. By determining that the target valve actuator etc. can be removed or added, remove the target valve actuator etc. while maintaining the communication path between the valve actuator other than the target valve actuator etc. and the control device. Can be added.

Furthermore, according to the second aspect of the present invention, since it is possible to communicate with a downstream valve actuator or the like through the first communication path or the second communication path even in a series communication path, the downstream valve A valve actuator or the like can be removed or added while maintaining communication with the actuator. Here, the entire network may form a series communication path. The entire network has, for example, a tree structure rooted in a control device, and a plurality of valve actuators etc. form a series communication path as part of the tree structure. Such a case may be used.

Furthermore, according to the third aspect of the present invention, for example, when the control device and a plurality of valve actuators have a series connection relationship, between the device adjacent on the upstream side and the device adjacent on the downstream side, By connecting multiple signal lines between them, multiple communication paths are formed, and upstream signal lines and downstream signal lines can be directly connected by connectors, so a single signal line pair can be directly connected. Then, by connecting other signal line pairs to the device, the device can be removed or added.

Furthermore, according to the fourth aspect of the present invention, a display means is provided in the judgment target valve actuator or the like, and it is displayed on the device that it can be removed or added using a state in which communication with the control device is possible. By doing so, the operator can easily recognize the state.

Further, according to the fifth aspect of the present invention, if the determination means has the same valve actuator that can communicate with the control device through the first communication path and the second communication path, the removal and the additional work are completed. By determining, it becomes possible to easily recognize the end of the work of the communication system.

It is a figure which shows the outline | summary of the communication system which concerns on the Example of this invention. 2 is a block diagram showing an outline of the configuration of a control device 3 and a valve actuator 5. FIG. It is a flowchart which shows an example of the process for removing a valve actuator. It is a flowchart which shows an example of the process for adding a valve actuator. It is a figure which shows the outline | summary of the conventional communication system 101 at the time of forming a communication path in series about the control apparatus 103 and the some valve actuator 105. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment of the present invention is not limited to the following examples.

FIG. 1 is a diagram showing an outline of a communication system according to an embodiment of the present invention. The communication system 1 includes a control device 3 (an example of a “control device” in the claims of the present application) and N (N is a natural number of 2 or more) valve actuators 5 (“valve actuator” and “communication devices in the claims of the present application). For example). Each valve actuator 5 _j (j is a natural number equal to or less than N) includes a main upstream signal line terminal 7 _j (an example of a “first upstream signal line terminal” in the claims) and a main downstream signal line terminal 9. _j (an example of a “first downstream signal line terminal” in the claims of the present application), a standby upstream signal line terminal 11 _j (an example of the “second upstream signal line terminal” in the claims of the present application), and a standby downstream side The signal line terminal 13 _j (an example of a “second downstream signal destination terminal” in the claims) is provided. The valve actuator 5 _N represents a terminal VA where there is no downstream valve actuator. Active terminators 19 ₁ and 19 ₂ are attached to the main downstream signal line terminal 9 _N and the standby downstream signal line terminal 13 _N of the terminal VA5 _N. When adding a valve actuator downstream, remove the terminator and connect the downstream signal line.

The valve actuator 5 ₁ is directly connected to the control device 3 via the

signal lines

15 ₁ and 17 ₁ without passing through another valve actuator. Signal line 15 ₁ is connected to the main upstream signal line terminal _71, the signal line 17 ₁ is connected to the standby upstream signal line terminal 11 _1.

The valve actuator 5 _i (i is a natural number of 2 or more and N−1 or less) is connected to the valve actuator 5 _i-1 by

signal lines

15 _i and 17 _{i, and} by

signal lines

15 _{i + 1} and 17 _{i + 1} , Connect to valve actuator 5 _{i + 1} . In the valve actuator 5 _i , the

signal lines

15 _i and 17 _i are respectively connected to the main upstream signal line terminal 7 _i and the standby upstream signal line terminal 11 _i , and the

signal lines

15 _{i + 1} and 17 _{i + 1} are respectively connected to the main Connect to the downstream signal line terminal 9 _i and the standby downstream signal line terminal 13 _i . Hereinafter, the communication line formed by the signal line 15 (an example of the “first communication path” in the claims of the present application) is referred to as a main line, and the communication line formed by the signal line 17 (the “first communication path in the claims of the present application”). An example of “two communication paths” is called a standby line. The signal line of each communication line is short-circuited inside the valve actuator.

The valve actuator 5 _N is connected to the valve actuator 5 _N-1 by

signal lines

15 _N and 17 _N. In the valve actuator 5 _N , the

signal lines

15 _N and 17 _N are connected to the main upstream signal line terminal 7 _N and the standby upstream signal line terminal 11 _N , respectively.

FIG. 1A is a diagram showing that the control device 3 and the N valve actuators 5 form a series communication path. The number of main line connections and the number of standby line connections are both N. The control device 3 detects information indicating which valve actuator is connected.

FIG. 1B is a diagram showing the state after the first operation for removing the valve actuator 5 _i is performed. 1 (b), the signal line 15 _i of the connecting portion 21 _i detached from the main upstream signal line terminal 7 _i, the signal line 15 i _{+ 1} of the connecting portion 23 i _{+ 1} of the main downstream signal line terminals 9 _i from the removal, to connect the connecting portion 23 i _{+ 1} of the connecting portion 21 _i and the signal line 15 i _{+ 1} of the signal line 15 _i. In the present embodiment, the shape of the connecting portion of the signal line 15 _i connecting portion 21 _i and the main downstream signal line terminal 9 _i is the same, and the connecting portion 23 _{i + 1 of} the signal line 15 _{i + 1} is connected to the main upstream side. by the shape of the connection portion of the signal line terminals 7 _i is the same, the connection portion 23 i _{+ 1} of the connecting portion 21 _i and the signal of the signal line 15 _i lines 15 i _{+ 1} can be connected. In FIG. 1B, the number of main line connections is N-1, and the number of standby line connections is N.

FIG. 1 (c) is a diagram illustrating a state after performing the second operation for removing the valve actuator 5 _i . When it is determined by the control device 103 that the valve actuator 5 _i can be removed, as shown in FIG. 1C, the connection portion 25 _i of the signal line 17 _i is removed from the standby upstream side signal line terminal 11 _i , Remove the connecting portion 27 i _{+ 1} of the signal line 17 i _{+ 1} from the standby downstream signal line terminal 13 _i, connecting the connecting portion 27 i _{+ 1} of the connecting portion 25 _i and the signal line 17 i _{+ 1} of the signal line 17 _i To do. In this embodiment, a shape of the connecting portion of the signal line 17 _i of the connecting portion 25 _i and the standby downstream signal line terminal 13 _i the same, of the connecting portion signal line 17 i _{_{+ 1}} 27 i _{+ 1} and the standby upstream by the shape of the connection portion of the signal line terminal 11 _i is the same, the connecting portion 27 i _{+ 1} of the connecting portion 25 _i and the signal line 17 i _{+ 1} of the signal line 17 _i is connectable. In FIG. 1C, the number of main line connections and the number of standby connections are N-1. As a result, it is possible to remove the valve actuator 5 _i and perform work such as maintenance.

In FIG. 1, the main line is removed and then the standby line is removed, but it may be removed from the standby line.

Also, the process of adding a valve actuator can be realized in the same manner. That is, from the state of FIG. 1C, the standby line can be connected to the state of FIG. 1B, and the main line can be connected to the state of FIG. In the case of addition, connection may be made from the main line.

FIG. 2 is a block diagram showing an outline of the configuration of the control device 3 and the valve actuator 5.

Referring to FIG. 2A, the control device 3 includes a recognition unit 31 (an example of “recognition unit” in the claims of the present application), a determination unit 33 (an example of “determination unit” in the claims of the present application), and a display. A control unit 35 (an example of “display control means” in the claims) is provided. The recognition unit 31 detects the valve actuator 5 connected to the main line and the standby line. The determination unit 33 determines whether the valve actuator 5 can be removed or added. The display control unit 35 causes the display unit 41 _j of the valve actuator 5 _j, and displays that can or add or remove the valve actuator 5 _j.

Referring to FIG. 2B, the valve actuator 5 _j includes a main upstream signal line terminal 7 _j , a main downstream signal line terminal 9 _j , a standby upstream signal line terminal 11 _j, and a standby downstream signal. A line terminal 13 _j , a display unit 41 _j (an example of “display means” in the claims of the present application), a communication unit 43 _j, and a control unit 45 _j are provided. The display unit 41 _j performs display under the control of the display control unit 35. The communication unit 43 _j performs communication with the control device 3. The control unit 45 _j controls operations such as valve opening / closing operations under the control of the control device 3.

FIG. 3 is a flowchart showing an example of a process for removing the valve actuator. For simplicity, the case where the valve actuator is removed from the main line and then the valve actuator is removed from the standby line will be described. The same can be achieved by removing from the standby line and from the main line.

First, the valve actuator 5 _i to be removed is specified (step STD1). For example, a number is assigned to the valve actuator 5 in the system, and the valve actuator 5 corresponding to the number input as the removal target by the operator is determined as the removal target.

Subsequently, in the main line, by connecting the connecting part 23 i _{+ 1} of the connecting portion 21 _i and the signal of the signal line 15 _i lines 15 i _{+ 1,} remove the valve actuator 5 _i from the main line (step STD2) . In the control device 3, the recognition unit 31 detects a valve actuator that can communicate with the main line and the standby line, and the determination unit 33 determines whether or not a removal condition is satisfied (step STD3). Here, the removal conditions, at one of the main line and the standby line, but can not communicate with the valve actuator 5 _i, the valve actuator other than the valve actuator 5 _i can communicate, on the other hand, the valve actuator 5 _i It is communicable with the valve actuator 5 including. Until the removal condition is satisfied, the end of the work in step STD2 is awaited. When the operation of removing the valve actuator 5 _i from the main line is completed, the removal condition is satisfied, and the process proceeds to step STD4. In step STD4, the display control unit 35 displays on the display unit 41 _j of the valve actuator 5 _j that it can be removed. Here, the display unit 41 _j is realized by, for example, an LED or the like, and is turned on in the state of FIG. 1A and turned off in the state of FIG. Good.

Then, in the standby line, by connecting the connecting portion 27 i _{+ 1} of the connecting portion 25 _i and the signal line 17 i _{+ 1} of the signal line 17 _i, to remove the valve actuator 5 _i from the standby line (step STD2) . In the control device 3, the recognizing unit 31 detects a valve actuator that can communicate with the main line and the standby line, and the determining unit 33 determines whether or not the removal work end condition is satisfied (step STD3). Here, the removal work end condition is that communication with the valve actuator 5 _i is not possible in both the main line and the standby line, but communication with valve actuators other than the valve actuator 5 _i is possible. The removal of the work in step STD5 is awaited until the removal work end condition is satisfied. When the operation of removing the valve actuator 5 _i from the standby line is finished, the removal work end condition is satisfied, and the process is finished.

FIG. 4 is a flowchart showing an example of processing for adding a valve actuator. For the sake of simplicity, a case will be described in which a valve actuator is connected to the standby line and subsequently a valve actuator is added to the main line. The same can be achieved when adding to the main line and adding to the standby line.

First, the valve actuator 5 _i to be added is specified (step STA1). For example, a number is assigned to the valve actuator 5 in the system, and when an operator instructs to add a valve actuator, a number not used in the system is assigned to the valve actuator to be added. Identify.

Then, in the standby line, and disconnect the connection part 27 i _{+ 1} connecting portion 25 _i and the signal line 17 i _{+ 1} of the signal line 17 _i, respectively, the standby upstream signal line terminals 11 _i and standby downstream By connecting to the signal line terminal 13 _i , the valve actuator 5 _i is added to the standby line (step STA2). In the control device 3, the recognition unit 31 detects a valve actuator that can communicate with the main line and the standby line, and the determination unit 33 determines whether or not an additional condition is satisfied (step STA3). Here, the additional condition, in one of the main line and the standby line, but can not communicate with the valve actuator 5 _i, the valve actuator other than the valve actuator 5 _i can communicate, on the other hand, the valve actuator 5 _i It is communicable with the valve actuator 5 including. Until the additional condition is satisfied, the end of the work in step STA2 is awaited. When the operation of adding the valve actuator 5 _i to the standby line is completed, the additional condition is satisfied, and the process proceeds to step STA4. In step STA4, the display control unit 35 displays on the display unit 41 _j of the valve actuator 5 _j that it can be added. Here, the display unit 41 _j is realized by, for example, an LED or the like, is turned off in the state of FIG. 1 (c), and is displayed in the state of (b) to indicate that addition is possible. May be.

Subsequently, in the main line, and disconnect the signal line 15 _i of the connecting portions of the 21 _i and the signal line 15 i _{+ 1} connection part 23 i _{+ 1,} respectively, the main upstream signal line terminal 7 _i and the main downstream By connecting to the signal line terminal 13 _i , the valve actuator 5 _i is added to the main line (step STA5). In the control device 3, the recognition unit 31 detects a valve actuator that can communicate with the main line and the standby line, and the determination unit 33 determines whether or not an additional work end condition is satisfied (step STA6). Here, the additional work end condition is that communication is possible with the valve actuator 5 including the valve actuator 5 _i in both the main line and the standby line. Until the additional work end condition is satisfied, the end of the work in step STA5 is awaited. When the operation of adding the valve actuator 5 _i to the main line is completed, the additional operation end condition is satisfied, and the processing is ended.

In this embodiment, the communication path is two main lines and standby lines, but a larger number may be used. When some of the plurality of valve actuators are connected to the series, the determination process may be performed on the part connected to the series.

Further, in the present embodiment, a case has been described in which the number of valve actuators to be removed or added is one, but even a plurality of valve actuators can be similarly implemented. For example, when removing or adding a plurality of valve actuators that are connected in series, the two upstream signal lines and downstream signal lines located at the end of the valve actuators do not pass through the valve actuator. It can be removed by connecting to. Further, the upstream signal line and the downstream signal line can be added by connecting them to two of the ends of a plurality of valve actuators connected in series. The valve actuators that are not continuously connected can be removed or added as described in this embodiment. The same can be realized in the case where continuous and non-continuous ones are mixed.

1 communication system, 3 control device, 5 valve actuator, 7 main upstream signal line terminal, 9 main downstream signal line terminal, 11 standby upstream signal line terminal, 13 standby downstream signal line terminal, 15, 17 signal line, 21, 23, 25, 27 connection unit, 31 recognition unit, 33 determination unit, 35 display control unit, 41 display unit, 43 communication unit, 45 control unit, 101 communication system, 103 control device, 105 valve actuator

Claims

A valve actuator communication system comprising a plurality of valve actuators and a control device communicating with the plurality of valve actuators,
Each valve actuator and the control device can communicate with each other through a plurality of communication paths including a first communication path and a second communication path.
The control device includes determination means for determining whether or not one or more determination target valve actuators can be removed or added.
The determination means is in a state where the determination target valve actuator and the control device can communicate through one of the first communication path and the second communication path and cannot communicate through the other, and other than the determination target valve actuator When the valve actuator and the control device are capable of communicating via the first communication path and the second communication path, it is determined that the determination target valve actuator can be removed or added. Valve actuator communication system.
The valve actuator communication system according to claim 1, wherein the first communication path and the second communication path are series communication paths of the control device and the plurality of valve actuators.
The determination target valve actuator includes a plurality of upstream signal line terminals and a plurality of downstream signal line terminals corresponding to the communication paths,
The upstream signal line terminal is a terminal to which an upstream signal line for communicating with the control device is connected,
The downstream signal line terminal communicates with some or all of the other valve actuators when the control device can communicate with some or all of the other valve actuators via the judgment target valve actuator. Is a terminal to which a downstream signal line is connected,
When the upstream signal line and the downstream signal line are connected to the upstream signal line terminal and the downstream signal line terminal, respectively, the control device can control the valve actuator to be determined and the other valve. It becomes possible to communicate with part or all of the actuator,
The upstream signal line and the downstream signal line terminal are not connected to the upstream signal line and the downstream signal line, respectively, and without passing through the judgment target valve actuator, the upstream signal line and the downstream signal line terminal, respectively. 3. The valve actuator according to claim 1, wherein when the downstream signal line is connected, the control device cannot communicate with the determination target valve actuator and can communicate with another valve actuator. Communications system.
The determination target valve actuator includes display means,
The control device includes display control means for causing the display means to display a determination result by the determination means,
The display control means can communicate with the display means of the determination target actuator when the determination means determines that the determination target valve actuator can be removed or added. The valve actuator communication system according to any one of claims 1 to 3, wherein a display indicating that the determination target valve actuator can be removed or added by the one of the communication path and the second communication path is displayed.
The determination means includes
After determining that the determination target valve actuator can be removed, the determination target valve actuator cannot communicate with the first communication path and the second communication path, and a valve actuator other than the determination target valve actuator When it is possible to communicate with, it is determined that the determination target valve actuator has been removed,
After determining that the determination target valve actuator can be added, the determination target valve actuator can communicate with the first communication path and the second communication path, and valve actuators other than the determination target valve actuator can be communicated. The valve actuator communication system according to any one of claims 1 to 4, wherein it is determined that the determination target valve actuator has been added when communication is possible.
A communication device connection state evaluation method for determining whether or not the configuration of a plurality of communication devices can be changed,
The control device that controls the plurality of communication devices and each of the communication devices can communicate with each other through a plurality of communication paths including a first connection path and a second connection path.
A recognition step for recognizing the communication device capable of communicating with the control device through a first communication path and a second communication path;
The determination unit includes one or a plurality of determination target communication devices in the communication device that can communicate with the control device through one of the first communication route and the second communication route, and can communicate with the control device through the other. If the communication device does not include the determination target communication device, and the communication device capable of communicating with the control device through the first communication path and the second communication path is the same except for the determination target communication device, the determination A communication device connection state evaluation method including a determination step of determining that a target communication device can be removed or added.
A program for realizing the communication device connection state evaluation method according to claim 6 in a computer capable of communicating with a plurality of communication devices.
An upstream signal line connected to the communication device for the communication device to communicate with the control device,
The control device is capable of communicating with other communication devices via the communication device,
The communication device
A downstream signal line terminal for connecting a downstream signal line for communicating with the other communication device;
An upstream signal line terminal for connecting the upstream signal line;
The downstream signal line includes a downstream connection part for connecting to the downstream signal line terminal,
The upstream signal line includes an upstream connection part for connecting to the upstream signal line terminal,
The downstream signal line is connectable between the downstream connection part and the upstream connection part without going through the communication device.
A downstream signal line comprising the downstream connection portion according to claim 8.