JP3356268B2 - Control system equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system device for a process industry such as a steel industry or a petrochemical industry, and particularly to a large-scale control system while performing advanced complex control.
The present invention relates to an improvement that can ensure a constant periodicity of data update.

[0002]

2. Description of the Related Art In the field of process automation, hybrid transmission is used as an extension of the conventional 4-20 mA transmission system. Hybrid transmission superimposes a low-speed digital signal on the conventional 4-20 mA,
Depending on the application, analog transmission and digital transmission can be used properly, and it is a simple network. However, in hybrid transmission, the effective digital transmission speed is as low as 2 to 3 messages / sec. Therefore, even if the functional blocks currently being executed by the distributed control device (DCS) are mounted on the field device side, It was practically impossible to read out data for monitoring the control operation of the functional block of the field device.

On the other hand, a digital two-way communication path, which replaces the conventional 4-20 mA transmission system between an intelligent field device called a field bus and a control system device, has been developed as a future standard in the field of process control and factory control. Is being done. In the field bus, a plurality of variables can be simultaneously read from a field device by a high-speed digital transmission technology, and it has become possible to monitor an operation state of a functional block of the field device. As a result, in a small-scale system having about two to three control loops, a control loop can be configured using functional blocks of field devices.

However, in a medium-scale system of about 10 control loops or a large-scale system of about 100 control loops, advanced control such as predictive control and fuzzy control is required. Therefore, it is essential to combine high-performance function blocks found in a conventional distributed control device with function blocks of field devices, and it is necessary for an operator to be able to monitor control operations in the same manner as the conventional function blocks.

FIG. 4 is a configuration diagram of a conventional functional block combination using virtual blocks . Fieldbus 10 includes
An analog input block AI as the field device 12,
The analog output block AO, the personal computer PC, and the communication control device 14 are connected. The communication control device 14 is connected to the node interface unit N via the internal bus 16.
IU connected to fieldbus 10 and remote I / O
The bus 20 is connected. The control unit 24 reads the data of the field device 12 from the remote I / O bus 20 via the communication unit 22. Express bus 30
It connects the control unit 24 and the operator station 26. The DCS block 28 is a functional block of the control unit 24. The virtual block 29 is a functional block of the field device 12 constructed in the control unit 24.

[0006] In the device thus constructed, the operator station 26 has a virtual block 29 through an interface similar to that of the DCS block 28.
To access. In the virtual block 29, the operator station 26 can read out the data of the field device 12 by periodically updating it according to the contents of the field device 12. From this, the operator
Access to virtual block 29
Therefore, as if it were a functional block of the field device 12
Read data from the field device 12 to access
Can be put out. The virtual block 29 is a control unit
24, the functional blocks of the field device 12
Functions as a virtual block.

[0007]

However, as the number of virtual blocks increases, the amount of data transferred between field devices increases, and the data update cycle may be extended, resulting in a loss of periodicity. is there. Usually, an update cycle of about one second is allowed for monitoring by the operator, so that the data update cycle may be slightly extended. However, when performing advanced complex control in combination with the DCS block, there is a problem that a delay in the data update cycle is not preferable because reliable constant periodicity is required. The present invention has solved such a problem, and when an operator station reads data of a field device using a virtual block ,
It is an object of the present invention to provide a control system device that can ensure a certain periodicity even if the setting of a virtual block increases.

[0008]

In order to achieve the above object, a control system device according to a first aspect of the present invention includes a control unit having a field device connected via an input / output bus, and a control unit connected to the control unit. the control system device having an operator station for the periodic and non-periodic accesses to provided functional blocks, built in the control unit, have a functionally equivalent blocks of field device functions, field device Function blocks
Of the virtual block that serves as a virtual block, provided with regularly updating means for periodically updating the parameters of the virtual blocks in accordance with the contents of the field device, before
The regular updating means uses parameters used in the virtual block.
When a periodicity is required, the corresponding
Readout from the virtual device and the connection parameters of the virtual block
Or the join parameter set in the virtual block.
It is characterized in that a meter is set to a corresponding field device .

According to claim 1 of the present invention, a control unit
And a device equivalent to the functional block of the field device
Virtual blocks of field device function blocks.
Since there is a virtual block that functions as a lock ,
The operator station can access the virtual block as quickly as the functional blocks of the control unit. Since the periodic updating means periodically updates the parameters of the virtual block according to the contents of the field device, the accuracy of the data can be ensured. Periodic updating means uses virtual
If the parameters used in the
When reading from the corresponding field device,
Tsu set click of binding parameters, or virtual block
Field device that supports the binding parameters set in
Is required to have a constant periodicity.
The parameters can be clearly identified as binding parameters.

[0010] In another aspect of the present invention, the operator
Options for the parameters used in the virtual block
When non-periodic access is sufficient,
Internal parameters of the virtual block read from the virtual device
Or the internal parameter set in the virtual block.
Internal parameters for setting the meter to the corresponding field device
With a configuration in which data setting means is provided, non-periodic
Parameters that are sufficient for the process are clearly defined as internal parameters
Can be identified.

Further, according to the third aspect, a virtual block
Whether the parameters used need to be periodic or non-periodic
Parameter attribute table to register whether or not
The internal parameter setting means has a
Of the parameters, internal parameters in the parameter attribute table
Configuration that overwrites virtual blocks with data specified
Then, a simple method using the batch reading function
Update parameters.

[0012]

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a configuration block diagram showing one embodiment of the present invention. In FIG. 1, components having the same functions as those in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted. Here, virtual
As the block 29, a PID block is illustrated. P
In the ID block, the input IN and the output OUT require periodicity, and the set point SP and the process value PV need only have non-periodic access. The connection parameter setting means 32 periodically updates the connection parameters. For example, in a PID block, the input IN and the output OUT
Is the binding parameter. Internal parameter setting means 34
Performs non-periodic updates to internal parameters. For example, in a PID block, a set point SP and a process value PV are internal parameters.

[0014] coupling periodic updates to the binding parameters by the parameter setting unit 32 sets the binding parameters of the virtual block 29 is read from the corresponding field device 12, or the corresponding binding parameters set in the virtual block 29 Field This is performed by setting to the device 12. Reading / reading between the connection parameters of the field device and the virtual block by the connection parameter setting means 32;
For writing, the remote I / O bus 20 is used. The remote I / O bus 20 is a communication bus having high speed and constant periodicity.

The non-periodic update of the internal parameters by the internal parameter setting means 34 is performed using a VIEW object. VIEW object is intended to be defined by the international standard fieldbus, intended for keeping grouping parameters related to the operation and configuration of the functional blocks, suitable plurality of the internal parameters to bulk load.

FIG. 2 is a view for explaining an example of the parameter attribute table 36. In the PID block shown in FIG. 1, there are a set point SP and a process value PV as internal parameters, and an input IN and an output OUT as connection parameters. Here, the name of the parameter, “0” for an internal parameter, and “0” for a combined parameter
1 "represents the type of parameter.

The operation of the above-configured device will be described. FIG. 3 is a flowchart illustrating the operation of the internal parameter setting unit 34. A plurality of internal parameters are read at once by the communication function of the control unit 24 (S1).
0). If the setting of all parameters has not been completed yet (S12), it is determined with reference to the parameter attribute table 36 whether the type of the parameter is an internal parameter or a combination parameter (S14). The connection parameters are excluded from the access to the fixed-periodicity by the connection parameter setting means 32, and only the internal parameters are excluded from the virtual block 2.
9 (S16). When the setting of all parameters is completed, the operation of the internal parameter setting means 34 this time ends.

In the above embodiment, a VIEW object for reading a plurality of internal parameters at once is used for setting the internal parameters to the virtual block .
The present invention is not limited to this. In short, it suffices to perform a process in which the connection parameter and the internal parameter are separated.

[0019]

As described above, according to the first aspect of the present invention, a control unit is constructed and a field device is provided.
Field device has the same function as
Functioning as virtual blocks of functional blocks
Since there is provided a block, virtual Bro functional blocks similar rapidity of the operator station control unit
Tsu access to click. Periodic updating means uses virtual
Since the parameters of the network are regularly updated according to the contents of the field device, data accuracy can be ensured. Set
The periodic update means determines the parameters used in the virtual block.
If periodicity is required, the corresponding fields
Read from the device and set in the virtual block connection parameters.
Connection parameters set in the virtual block
Data to the corresponding field device
Parameters that require periodicity are
Data can be clearly identified.

[0020] Further , an operator station is provided.
Options for the parameters used in the virtual block
When non-periodic access is sufficient,
Internal parameters of the virtual block read from the virtual device
Or the internal parameter set in the virtual block.
Internal parameters for setting the meter to the corresponding field device
With a configuration in which data setting means is provided, non-periodic
Parameters that are sufficient for the process are clearly defined as internal parameters
Can be identified.

Further, according to the third aspect, a virtual block
Whether the parameters used need to be periodic or non-periodic
Parameter attribute table 3 for registering whether access is sufficient
6 and the internal parameter setting means reads out all at once.
Of the parameters that have been
Overwrite virtual block with specified parameters
With this configuration, a simple method using the batch reading function
Internal parameters can be updated.

[0022]

[Brief description of the drawings]

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

FIG. 2 is a diagram illustrating an example of a parameter attribute table.

FIG. 3 is a flowchart illustrating an operation of an internal parameter setting unit.

FIG. 4 is a configuration diagram of a conventional functional block combination using virtual blocks .

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 12 Field device 20 I / O bus 24 Control unit (FCU) 26 Operator station (OPS) 29 Virtual block 32 Periodic updating means (combined internal parameter setting means) 34 Internal parameter setting means 36 Parameter attribute table

Claims (3)

(57) [Claims] 1. A field device is connected via an input / output bus.
Control unit and the control unit
Periodic and non-periodic access to functional blocks
Control system having an operator station
In the control unitBuilt, Field device function block
Has the same function as lockAnd field device function block
Virtual block that functions as a virtual block of
And thisVirtual blockThe parameters of the field device
Update regularly according toRegular updatesWith meansAnd
The periodic updating means includes a parameter used in the virtual block.
If the filter requires periodicity, the corresponding filter
From the virtual device
Parameters set in the virtual block or the virtual block.
Specially set the parameters to the corresponding field devices.
Control system equipment. 2. The virtual station according to claim 1, wherein
Non-periodic access to parameters used in
If it is enough, read it from the corresponding field device.
To the internal parameters of the virtual block
Internal parameters set in the virtual block
Has internal parameter setting means for setting to device
The control system device according to claim 1, wherein: 3. The method according to claim 1, wherein parameters used in said virtual block are fixed.
Whether periodicity is needed or non-periodic access is sufficient
A parameter attribute table to be recorded, and the internal parameter setting means includes a
Internal parameters in the parameter attribute table
Overwrite the virtual block with
3. The control system device according to claim 2, wherein: