JP2001333128A - Control system network system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control system network system that can conduct an engineering work without stopping an application even when the engineering work is required. SOLUTION: A node A (B) is provided with a control processing means A-2 (B-2) and a communication processing means A-1 (B-1) whose operation mode can be revised independently of each other. An engineering tool T changes an operating mode of the communication processing means A-1, B-1 into an off-line mode when conducting an engineering work to rewrite a communication condition set to the nodes A, B. The operating mode of the control processing means A-2, B-2 conducting an application operation such as control is kept in an operation mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control network system in which nodes for monitoring a sensor, controlling driving of an actuator, and the like are interconnected by a network.

[0002]

2. Description of the Related Art OA (Office A) using a computer
In the environment of automation (automation) and factory automation (FA), an open network is constructed by adopting a standard for securing and operating various types of devices and software. In this, LO
N (Local Operating Network) is for building facility control (B
It is being used as a standardized open network in the field of A). LON is a private operation network developed by Echelon Corporation of the United States, and employs a dedicated communication protocol called LonTalk.

[0003] Various settings of the LON system are usually performed using an engineering tool connected to a network. The engineering tool obtains basic information about nodes (LonMark documentation network variable configuration) from a network device (Lon Device, hereinafter referred to as a node) or an XIF (eXternal Interface File). By performing detailed settings of individual nodes and defining data communication of input / output network variables exchanged between the nodes on the engineering tool, necessary information is created and deployed to each node.

[0004] In the LON, performing an addressing operation, a binding operation, and a configuration operation of a network is called an engineering operation. The addressing work is a work of defining a node on an engineering tool and assigning an address to the node.

Further, as shown in FIG. 6, an address "1"
A reference is made to an output network variable of the node A to which the address “2” is assigned by the node B
When an output network variable having a reference is defined by referring to the node A, the engineering tool T automatically determines a selector ID as a key for referring to the network variable, and expands the selector ID at each node. The selector ID does not need to be unique for the entire system, but may be unique among nodes exchanging network variables.

Network variable data communication between nodes in a LON network is basically performed based on a selector ID. When each node refers to a network variable of another node, the selector ID is used.
Will be performed. In this manner, one or a plurality of network variables transmitted and received between the nodes is defined in association with each other, and the related information including the selector ID is determined. This is called a binding operation. Therefore, the network variable groups associated with each other have the same selector ID. The configuration work is a work of tuning various parameters of the network and the node. In addition to the polling method of requesting a network variable using a selector ID as a key, a method of referring to a network variable includes a fetch method using an index (arrangement order) of the network variable.

[0007]

As described above, communication conditions such as transmission / reception data between nodes are set by engineering work before actual operation. In the conventional system, even if the actual operation is started after setting the communication conditions by engineering work, the selector ID can be changed if the network variable or network configuration changes due to addition or deletion of nodes etc. There is a possibility that the already defined selector ID cannot be used. Therefore, when a change occurs in a network variable or a network configuration, it is necessary to perform an engineering operation again. When performing the engineering work (binding work), it is necessary to change the operation mode of the node to the offline mode by a signal from the engineering tool in order to rewrite the communication conditions set for each node. However, the conventional node connected to the LON uses a dedicated IC (for example, a neuron chip TMPN3120E1M manufactured by Toshiba). In such an IC, when the operation mode is changed to the offline mode, the application is changed. (For example, operations such as sensor monitoring and actuator drive control) are also stopped. If the control operation by the node stops during driving, an accident may occur. For example, for those requiring precise control in a short cycle, such as a water pump pressure control, there is a possibility that an accident such as water drop may occur by stopping control for several seconds.

In the field work, the person who sets the network (network integrator) and the person who adjusts the field equipment may be different. Depending on the work process of the field, the network setting work and the adjustment of the field equipment may be performed. It is assumed that the work and the work proceed simultaneously. At this time, the operation of the on-site equipment may be changed due to the network adjustment work, and there is a possibility that a worker of the on-site equipment may be in danger due to contact with rotating equipment such as a fan or ejection of steam from a humidifier. . The present invention has been made in order to solve the above-described problems, and even when a network variable or a network configuration is changed and engineering work needs to be performed, the operation state is maintained without stopping applications such as control. It is an object of the present invention to provide a control system network system capable of performing an engineering work by using and rewriting communication conditions. It is another object of the present invention to provide a control network system that can ensure the safety of workers even when a network setting operation and a field device adjustment operation proceed simultaneously.

[0009]

A control network system according to the present invention includes a node (A,
B) and a network (1) interconnecting each node
It consists of: The node performs control processing means (A-2, B-2) for performing a predetermined monitoring operation / control operation.
And communication processing means (A-1, B-1) connected to the network and transmitting / receiving data to / from the network, wherein the control processing means includes an operation mode for performing a predetermined operation and a predetermined operation. The communication processing means has at least two operation modes: an online mode in which data can be transmitted and received according to communication conditions, and an offline mode for rewriting communication conditions. The processing means and the communication processing means can change the operation mode independently of each other. Also, the control network system of the present invention has an engineering tool (T) connected to the network for setting communication conditions in the node. The engineering tool has a control processing unit in an operation mode.
When performing an engineering operation for rewriting the communication conditions set in the node during the operation in which the communication processing means is in the online mode, the operation mode of the communication processing means is changed to the offline mode (T-1, T-2). )
It has.

[0010] Further, as one configuration example of the control system network system of the present invention, when the communication processing means of the own node is in an offline mode, the control processing means of the node transmits and receives data via the network to the own node. No request is made to the communication processing means. Further, as one configuration example of the control system network system of the present invention,
The communication processing means of the node does not transmit / receive data via the network when in the offline mode. As one configuration example of the control network system of the present invention, the network is a local operation network (LON).

[0011]

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a control network system according to an embodiment of the present invention. The control network system according to the present embodiment is applied to, for example, a building management system or a plant management system, and includes field devices A1 and B1 such as sensors or actuators (eg, lights, switches, and motors) and field devices. Network device (Lon Device) that monitors or controls the devices A1 and B1 respectively
, The engineering tool T for performing the engineering work of the nodes A and B, the keyboard K for the operator to give instructions to the engineering tool T, and the information of the engineering tool T are displayed. Device D for LON (Local Operat
ing Network 1).

The node A includes a communication processing unit A-1 serving as a communication interface for transmitting and receiving data to and from the LON1 according to communication conditions, a control processing unit A-2 for controlling the entire node, and a control processing unit A- Control program table A-3 storing the program of the second
It has a data table A-4 for storing network variables that are measurement data from No. 1 or drive control data for the field device A1, and a communication condition table A-5 for storing communication conditions. The configuration of the node B is the same as that of the node A. The communication processing means A-1 and B-1 can be realized by, for example, the above-described neuron chip, and the control processing means A-2 and B-2 can be realized by, for example, a CPU.

The engineering tool T is a communication processing means T-1 serving as a communication interface with the LON1.
And a binding information processing means T-2 for controlling the entire tool, for example, comprising a CPU, and a binding information table T-3 for storing binding information serving as a basis for the communication conditions.

Next, as an operation of the control network system as described above, an operation (installation) at the time of constructing the network system will be described first. FIG. 2 is a flowchart for explaining the operation at the time of constructing the network system, and FIG. 3 is a diagram showing the communication condition tables A-5 and B-5 of the nodes A and B at the time of constructing the network system.

Communication processing means A-1, B- of nodes A, B
The first operation mode includes an online mode, an offline mode, and other modes. The online mode is a mode during normal operation, and the communication condition table A-
In this mode, data can be transmitted / received in accordance with the communication conditions (binding information) set in 5, B-5. The offline mode is a mode at the time of engineering work, and is a mode in which communication conditions set in the communication condition tables A-5 and B-5 can be rewritten.

Control processing means A-2, B- of nodes A, B
The two operation modes include an operation mode, a stop mode, and other modes. The operation mode is a mode at the time of the normal operation, and according to the control programs stored in the control program tables A-3 and B-3, the field devices A1 and B
1 and data processing means A-1, B-
This is a mode in which processing such as transmission of a transmission request to the device 1 or drive control of the field devices A1 and B1 is performed. The stop mode is a mode in which the processing of the control program is not performed.

As shown in FIG. 3, the communication condition table A-
5 and B-5 are NVI and data tables A-B described later for each network variable transmitted and received by nodes A and B.
NV-fixed structure table (hereinafter referred to as NVI table) for associating them with B4 and B-4
A-51, B-51 and N for each network variable
NV configuration for associating a VI with an I / O type indicating whether the corresponding network variable is an output variable or an input variable, a selector ID, and an index of an address table storing addresses of communication nodes, in association with each other. Address tables A-52 and B-52, and an address table A- for storing a destination node address or a destination node address which is a source node address of each network variable. 53 and B-53.

The correspondence between the data tables A-4 and B-4 and the NVI tables A-51 and B-51 is obtained by a data pointer. The data pointer is a memory address that specifies a data storage destination of the data tables A-4 and B-4. Also, NV Conf Tables A-52, B-
The correspondence between the address table 52 and the address tables A-53 and B-53 is obtained by the partner node address table index. The partner node address table index is a record number that specifies a record of the address tables A-53 and B-53.

When starting the engineering work when constructing the network system, the engineering tool T
Of the nodes A and B
An off-line mode signal for setting the communication processing means A-1 and B-1 to the offline mode is transmitted to the nodes A and B via the communication processing means T-1 (step 101).

Communication processing means A-1, B- of nodes A, B
1 receives the off-line mode signal via the LON1, switches to the off-line mode, and sends operation mode information indicating that the off-line mode has been switched to the control processing means A-2 and B-2 of its own node ( Step 102). When building a network system,
The operation mode of the control processing means A-2, B-2 of the nodes A, B is a stop mode in response to a command from the engineering tool T.

Next, the binding information processing means T-2 of the engineering tool T performs an addressing operation for setting the node addresses of the nodes A and B (step 103). Here, it is assumed that the node address of the node A is set to “1” and the node address of the node B is set to “2”.

Next, the binding information processing means T-2
Starts the binding operation of the nodes A and B, and sets the binding information of the nodes A and B (the destination node address of the network variable or the destination node address which is the source node address, the communication parameter, the selector assigned to the network variable). An ID, a partner node address table index, etc.) are created, and the created binding information is temporarily stored in the binding information table T-3 (step 104). Subsequently, the binding information processing means T-2 reads the binding information from the binding information table T-3, and transmits this information to the nodes A and B via the communication processing means T-1 (Step 105).

The network variables transmitted and received by the nodes A and B, the I / O type of the network variables, the data pointer, and the network variable index (hereinafter referred to as NV
Is determined in advance at each of the nodes A and B before the engineering work. NVI is an invariable index number unique to the own node, which is assigned to a network variable transmitted and received by the own node, and is a record number for specifying a record (one horizontal row of the table) of the NVI table and the NV conf table. .

In this embodiment, the node A monitors the field device A1 and also monitors the field device B1 via the node B and the LON1. At the node A, NVI is added to the network variable which is the measurement data of the field device A1.
“1” is assigned in advance, and the I / O of this network variable
It is assumed that “output” is set in advance as the type, NVI “2” is previously assigned to the network variable that is the measurement data of the field device B1, and “input” is set in advance as the I / O type of this network variable. I do. The node B monitors the field device B1 and also monitors the field device A1 via the node A and the LON1. In the node B, NVI “1” is previously assigned to a network variable that is measurement data of the field device B1, “output” is set in advance as an I / O type of the network variable, and a network that is measurement data of the field device A1 is set. NVI for variables
“2” is assigned in advance, and the I / O of this network variable
It is assumed that “input” is set in advance as the type.

The binding information transmitted from the engineering tool T is written into the communication condition tables A-5 and B-5 via the LON1 and the communication processing means A-1 and B-1 of the nodes A and B, The communication conditions of the nodes A and B are set (step 106).

Here, the NVI of the NVI table A-51 is
Data pointer "1" is assigned to the record specified by "1".
Are set in advance, and a data pointer “100” is set in advance in the record designated by NVI “2” in the table A-51. As a result, the network variable to which NVI “1” is assigned is stored at the address specified by the data pointer “1” in the data table A-4, and NV
The network variable to which I “2” is assigned
-4 is stored at the address specified by the data pointer "100".

The NVI in the NVI table B-51
Data pointer "1" is assigned to the record specified by "1".
Is set in advance, and a data pointer “50” is set in advance in the record designated by NVI “2” in the table B-51. As a result, the network variable to which NVI “1” is assigned is stored at the address specified by the data pointer “1” in the data table B-4, and the NVI
The network variable to which "2" is assigned is as shown in Table B-
4 is stored at the address specified by the data pointer “50”.

Next, with respect to the network variable to which NVI "1" is added in the node A, the address "2" of the destination node B is set as the destination node address in the binding information, and the selector of this network variable is set. It is assumed that “1” is set as the ID and “5” is set as the partner node address table index. With this binding information, N
In the record designated by NVI "1" of the V-conf table A-52, "5" is written as the partner node address table index, "1" is written as the selector ID, and the partner table of the address table A-53 is written. The partner node address “2” is written in the record specified by the node address table index “5”.

For the network variable to which NVI "2" is assigned at the node A, "2" is set as the selector ID of this network variable in the binding information, and "6" is set as the partner node address table index. Is set.
With this binding information, the NV conf table A
In the record specified by NVI “2” of −52, “6” is written as the destination node address table index, “2” is written as the selector ID, and the destination node address table index of the address table A-53 is written. The partner node address “2” is written in the record designated by “6”. Now, FIG.
NV Conf table A-52 shown in (c) and FIG. 3 (d)
Has been completed, and the creation of the communication condition table A-5 has been completed.

On the other hand, for the network variable to which NVI "1" is added in the node B, the address "1" of the destination node A is set as the destination node address in the binding information, and the selector ID of this network variable is set. Is set to “2”, and “0” is set as the partner node address table index. With this binding information, N
In the record designated by NVI "1" of the V-conf table B-52, "0" is written as the partner node address table index, "2" is written as the selector ID, and the partner table of the address table B-53 is written. The partner node address “1” is written in the record specified by the node address table index “0”.

For the network variable to which NVI "2" is assigned in the node B, "1" is set as the selector ID of the network variable in the binding information, and "0" is set as the partner node address table index. Is set.
With this binding information, NV conf table B
In the record specified by the NVI “2” of −52, “0” is written as the partner node address table index, “1” is written as the selector ID, and the partner node address table index of the address table B-53 is written. The partner node address "1" is written in the record designated by "0". Now, FIG.
NV Conf Table B-52 shown in (g) and FIG.
Has been completed, and the creation of the communication condition table B-5 has been completed.

Since the binding operation has been completed, the binding information processing means T-2 of the engineering tool T communicates with the communication processing means A-1 of the nodes A and B.
An online mode signal for setting B-1 to the online mode is transmitted to nodes A and B via communication processing means T-1 (step 107). When the communication processing means A-1 and B-1 of the nodes A and B receive the online mode signal via the LON1, the communication processing means A-1 and B-1 switch to the online mode and send the control processing means A-2 and B-2 of their own nodes. Operation mode information indicating that the mode has been switched to the online mode is sent. This completes the engineering work shown in FIG.

Next, the operation during normal operation will be described. Data table A- for nodes A and B during normal operation
4 and B-4 are shown in FIG. NV at node A
Network variable to which I “1” is assigned (field device A1
Of the measurement data) is “α”. The control processing means A-2 of the node A performs the NV corresponding to the corresponding network variable.
I “1” is obtained from the NV conf table A-52,
The data pointer “1” corresponding to VI “1” is obtained from the NVI table A-51, and “α” is written to the address of the data table A-4 corresponding to the data pointer “1”.

On the other hand, at the node B, the value of the network variable (measured data of the field device B1) to which NVI "1" is assigned is "β". Node B control processing means B-
2 acquires the NVI “1” corresponding to the relevant network variable from the NV conf table B-52, and acquires the NVI “1”.
Data pointer "1" corresponding to NVI table B-
51, and writes “β” into the address corresponding to the data pointer “1” in the data table B-4.

When the node A refers to the network variable of the node B, the control processing means A-2 of the node A
Requests the communication processing means A-1 of its own node to acquire a network variable. In response to a request from the control processing means A-2, the communication processing means A-1 reads out the partner node address and the selector ID corresponding to the monitored network variable from the communication condition table A-5 of the own node, and And creates a network variable inquiry message (hereinafter referred to as an NV inquiry message) in which the read destination node address is set as the transmission destination address, and transmits this message to the node B.

The control processing means B-2 of the node B sends a transmission request to the communication processing means B-1 of its own node at regular time intervals or when receiving the NV inquiry message.
When transmitting at regular time intervals, the communication processing means B-1 extracts a network variable to be transmitted from the data table B-4, and also stores a destination node address and a selector ID corresponding to the network variable in the communication condition table B- 4. 5 and network variable and selector ID
And sends a network variable transmission message (hereinafter referred to as an NV transmission message) in which the destination node address is set as the destination address, and transmits this message to the destination node A.

When receiving the NV inquiry message from the node A, the communication processing means B-1 extracts the selector ID from the received message, and
A network variable corresponding to D is stored in a data table B-4.
, And acquires the destination node address corresponding to the network variable from the communication condition table B-5, creates an NV transmission message in the same manner as described above, and transmits this message to the node A.

When the communication processing means A-1 of the node A receives the NV transmission message from the node B, it passes it to the control processing means A-2 of its own node. Control processing means A-2
Is the network variable and selector I
D is taken out, a data pointer corresponding to the selector ID is obtained from the communication condition table A-5, and a network variable is written to the address of the data pointer in the data table A-4. Thus, the value of the network variable “β” is written to the address specified by the data pointer “100” in the data table A-4.

When the node B refers to the network variable of the node A, the operation of transmitting the NV inquiry message from the node B to the node A, and the operation of the node A at regular time intervals or in response to the NV inquiry message.
The operation of transmitting the transmission message is the same as described above.
As a result, the value of the network variable “α” is written to the address specified by the data pointer “50” in the data table B-4.

Next, the operation when a change occurs in a network variable or a network configuration during normal operation will be described. FIG. 5 is a flowchart for explaining the operation when changing a network variable or changing a network configuration. As described above, when a change occurs in a network variable or a network configuration, another engineering operation is required. Therefore, the binding information processing means T-2 of the engineering tool T
An off-line mode signal is transmitted to each node connected to ON1 (step 201).

When the communication processing means of each node (for example, the communication processing means A-1 and B-1 of the nodes A and B) receives the offline mode signal, the communication mode is switched to the offline mode, and the control processing means of its own node is controlled. Operating mode information indicating that the mode has been switched to the offline mode (step 202).

At this time, the control processing means of each node (for example, the control processing means A-2 and B-2 of the nodes A and B) keep the operation mode. However, even if an attempt is made to continue the transmission operation of the network variable even during the engineering work, the communication processing means continuously transmits the network variable according to the set communication conditions, so that the communication is not normally performed depending on the timing. There is fear.
That is, the network variable may not be transmitted to the authorized partner while the communication condition is being changed.

To solve this problem, when the control processing means of each node recognizes from the operation mode information that the communication processing means of its own node is in the offline mode, it issues a network variable acquisition request or a transmission request. The transmission to the communication processing means of the own node is stopped. Note that instead of the control processing unit stopping the request to the communication processing unit, the communication processing unit may not respond to the request even if the communication processing unit receives a request from the control processing unit of the own node.

Next, the binding information processing means T-2 of the engineering tool T performs an addressing operation for setting a node address of each node connected to the LON 1 (step 203). In this case, if there is a newly added node, it goes without saying that a node address is set for this node as well. In addition,
The addressing operation is performed only when there is a newly added node or when there is a change in the node configuration.

Subsequently, the binding information processing means T-
2 creates binding information for rewriting communication conditions according to a change in a network variable or a network configuration, and temporarily stores the created binding information in the binding information table T-3 (step 2).
04). Then, the binding information processing means T-2
Transmits this binding information to each node via the communication processing means T-1 (step 205).

The binding information transmitted from the engineering tool T is written into the communication condition tables A-5 and B-5 via the LON1 and the communication processing means A-1 and B-1 of the nodes A and B, respectively. The communication conditions of the nodes A and B are reset (step 206). This process
Since this is the same as step 106, the description is omitted. After the binding work is completed, the engineering tool T
The binding information processing means T-2 transmits an online mode signal to each node connected to LON1 (step 207). Upon receiving the online mode signal, the communication processing means of each node switches to the online mode, and sends operation mode information indicating that the mode has been switched to the online mode to the control processing means of its own node. This completes the engineering work shown in FIG.

In this embodiment, the nodes A and B for monitoring field devices (sensors) A1 and B1 are described as examples of network devices. However, actuators (for example, lights, switches, motors, etc.) are used as network devices. Network device that outputs control data and drives and controls the actuator. Further, in the present embodiment, the network devices are the two nodes A and B, but it is needless to say that the number of the network devices is not limited to two.

In the present invention, the control processing means A-2
Since (B-2) and the communication processing means A-1 (B-1) can change the operation mode independently of each other, for example, the control processing means A-2 (B-2) sets the operation mode. At this time, the operation mode of the communication processing means A-1 (B-1) can be changed, and when the control processing means A-2 (B-2) is in the stop mode, the communication processing means A-1 (B- The operation mode of 1) can be changed, and the communication processing means A-
When 1 (B-1) is in the online mode, the operation mode of the control processing means A-2 (B-2) can be changed, and when the communication processing means A-1 (B-1) is in the offline mode. The operation mode of the control processing means A-2 (B-2) can be changed. As a result, even when the network setting operation and the on-site equipment adjustment operation proceed simultaneously, the control processing means A-2 (B-2) can be set to the stop mode to ensure the safety of the operator.

The operation mode of each of the control processing means A-2 (B-2) and the communication processing means A-1 (B-1) can be instructed via the LON1. L
If a command from ON1 is not possible, a communication cable (RS-232C, RS-485, etc.) can be directly connected to the node to change the operation mode.

[0050]

According to the present invention, the operation mode of the control processing means and the operation mode of the communication processing means can be changed independently of each other. By setting the control processing means in the stop mode, the safety of the worker can be ensured.

Further, a control processing means and a communication processing means capable of changing the operation mode independently of each other are provided in each node, and when the engineering tool performs an engineering work for rewriting the communication conditions set in the node, the communication processing is performed. By changing the operation mode of the processing means to the offline mode, even when a network variable or a network configuration is changed and engineering work needs to be performed, without stopping the control processing means for performing application operations such as control, Engineering work can be performed in the operating state, and communication conditions can be rewritten. As a result, the reliability of the system can be improved.

When the communication processing means of the own node is in the offline mode, the control processing means does not request the communication processing means of the own node to transmit / receive data through the network. Erroneous transmission can be prevented.

In the off-line mode, the communication processing means does not transmit / receive data via the network, so that erroneous transmission of network variable data can be prevented.

[Brief description of the drawings]

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

FIG. 2 is a flowchart for explaining the operation of the control network system of FIG. 1 when constructing a network system.

FIG. 3 is a diagram showing a state of a communication condition table of each node when a network system is constructed.

FIG. 4 is a diagram showing a state of a data table of each node during normal operation.

5 is a flowchart for explaining the operation of the control network system of FIG. 1 when a network variable is changed or a network configuration is changed.

FIG. 6 is a block diagram showing a configuration of a conventional control network system.

[Explanation of symbols]

1: LON, A, B: Node, A1, B1: On-site equipment,
D: display device, K: keyboard, T: engineering tool, A-1, B-1, T-1: communication processing means, A-
2, B-2: control processing means, A-3, B-3: control program table, A-4, B-4: data table, A
-5, B-5: communication condition table, T-2: binding information processing means, T-3: binding information table.

Claims (5)

[Claims] 1. A control network system comprising a node which is a network device and a network interconnecting the nodes, wherein the node comprises: a control processing means for performing a predetermined monitoring operation / control operation; Communication control means for transmitting and receiving data to and from a network, wherein the control processing means includes at least two of an operation mode for performing the predetermined operation and a stop mode for not performing the predetermined operation.
The communication processing means comprises at least two operation modes: an online mode in which data can be transmitted and received according to the communication conditions, and an offline mode for rewriting the communication conditions. A control network system wherein the communication processing means can change the operation mode independently of each other. 2. The control network system according to claim 1, further comprising an engineering tool connected to the network for setting communication conditions for the node, wherein the engineering processing tool operates the control processing means. Means for changing an operation mode of the communication processing means to an offline mode when performing an engineering work for rewriting communication conditions set in the node during operation in a mode state and the communication processing means is in an online mode state. A control network system comprising: 3. The control network system according to claim 1, wherein the control processing unit of the node transmits and receives data via the network when the communication processing unit of the own node is in an offline mode. Is not required to the communication processing means of the own node. 4. The control network system according to claim 1, wherein the communication processing unit of the node does not transmit / receive data via the network when the node is in an offline mode. Control network system. 5. The control network system according to claim 1, wherein the network is a local operation network (LON).
A control network system characterized by the following.