KR102273419B1 - Apparatus for controling programmable logic controller system having multi cpu module - Google Patents

Abstract

The present invention relates to a control device for a PLC system. According to the present invention, when a control request for data processing of a register in which the control right status information of the multi-CPU module is recorded is received, the control right is dynamically allocated to the multi-CPU module by referring to the control right status information of the register, and It is characterized in that it comprises a control right setting unit for setting the control right of the CPU module and a bus for transmitting and receiving data between the multi-CPU module and the function module according to the setting of the control right. According to the present invention, there is an advantage in that resources of the PLC system can be efficiently distributed and data processing efficiency can be improved.

Description

Control device of PLC system with multiple CPU modules {APPARATUS FOR CONTROLING PROGRAMMABLE LOGIC CONTROLLER SYSTEM HAVING MULTI CPU MODULE}

The present invention relates to an apparatus for controlling a PLC system, and more particularly, to an apparatus for controlling a PLC system through dynamic allocation of control rights to a multi-CPU module or a multi-core CPU module.

A PLC system (Programmable Logic Controller) is a system in which all relay systems are integrated using a microprocessor, and refers to a system capable of sequence control, various operations and data processing through a program. The PLC system has the advantage of being able to easily expand or change the system through programming and respond quickly to the work environment.

Recently, as the data throughput of the PLC system increases, a CPU module having a multi-core or a multi-CPU module is mounted in the PLC system.

1 is a schematic diagram of a PLC system having a conventional multi-PLC module. Referring to FIG. 1 , the PLC system includes a multi-CPU module including a power module, a function module, and a plurality of CPU modules. Each CPU module has control over the function module and processes data according to the data processing request of the function module.

Meanwhile, in the conventional PLC system, each CPU module has a read (READ) or a write (WRITE) right, that is, a control right only to a function module designated in advance. For example, the CPU module A has control rights only for module 1 and module 2, and cannot have control rights for other modules (modules 3 to 6). That is, in the conventional PLC system, only the CPU module designated in advance has the control right for the specific function module.

FIG. 2 is a diagram showing a control right state for each CPU module of the PLC system of FIG. 1 . Referring to FIG. 2 , CPU module (A) has control rights for modules 1 and 2, CPU module (B) has control rights for modules 3 and 4, and CPU module (C) has control rights for modules 5 and 6 have control.

As described above, in the conventional PLC system, only the CPU module A has the control right for the modules 1 and 2, and a specific CPU module preempts the control right for the specific function module. Therefore, in the conventional PLC system, resource allocation is not made equally, and there is a problem in that the data processing efficiency of the multi-CPU module is lowered.

The present invention provides a control device for a PLC system having a multi-CPU module that can efficiently allocate resources of the PLC system and improve data processing efficiency by dynamically allocating the control right of the multi-CPU module with reference to the control right status information of the register aim to do

The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the present invention not mentioned may be understood by the following description, and will be more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the appended claims.

The present invention for achieving this object is a control device of a PLC system having a multi-CPU module, a register in which control right status information of the multi-CPU module is recorded, and when a control request for data processing of a function module is received, the register A control right setting unit that dynamically allocates control right to the multi-CPU module and sets the control right of the multi-CPU module for the function module with reference to the control right status information of It is characterized in that it includes a bus for transmitting and receiving data.

According to the present invention as described above, by dynamically allocating the control right of the multi-CPU module with reference to the control right status information of the register, there is an advantage in that the resources of the PLC system can be efficiently distributed and data processing efficiency can be improved.

1 is a schematic diagram of a PLC system having a conventional multi-PLC module.
FIG. 2 is a table showing a control right state for each CPU module of the PLC system of FIG. 1; FIG.
3 is a block diagram of a control device of a PLC system having a multi-CPU module according to an embodiment of the present invention.
4 is a flowchart of a control method of a PLC system having a multi-CPU module according to an embodiment of the present invention.
5 is a flowchart of a control method of a PLC system having a multi-CPU module according to another embodiment of the present invention.
6 is a table showing a control right state for each CPU module according to an embodiment of the present invention.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to refer to the same or similar components.

3 is a block diagram of a control device of a PLC system having a multi-CPU module according to an embodiment of the present invention. Referring to FIG. 3 , the control device 300 of the PLC system having a multi-CPU module according to the present invention includes a register 310 in which control right state information of the multi-CPU module is recorded and a control right setting unit for dynamically allocating the control right of the multi-CPU module. (320).

In addition, the multi-CPU module 100 of the PLC system is connected to the function module 200 of the PLC system through a bus, and the bus is the multi-CPU module 100 and the function module ( 200) can transmit and receive data. That is, the CPU module having a control right to the function module 200 may have a read (READ) or a write (WRITE) right, and data may be transmitted/received through a bus for data processing of the CPU module.

Here, the multi-CPU module may be composed of a plurality of CPU modules as shown in FIG. 3 or may be composed of a CPU module having multiple cores in the CPU module.

In the register 310, control right state information of each of the multiple CPU modules is recorded. Here, the control right status information means information on the control right that each multi-CPU module has for a specific function module. The control right status information may include information about a function module to which an arbitrary CPU module has the control right, and information on whether the control right is assigned to the CPU module.

More specifically, in the case of the multi-CPU module 100 composed of three CPU modules as shown in FIG. 3 , control right state information of each of the CPU modules A, B, and C may be recorded in the register 310 . For example, when the control right for the module 1 is set in the CPU module A, the control right state information of the register 310 may record that the CPU module A is in a control right assignment impossible state.

The register 310 refers to a storage device in which control right state information can be recorded, and may be implemented as a memory such as ROM, RAM, FLASH MEMORY, or SD card according to an embodiment. .

The control right setting unit 320 refers to the control right state information of the register 310 and dynamically allocates the control right to the multi-CPU module 100 to set the control right of the multi-CPU module 100 for the function module 200. carry out

Specifically, the control right setting unit 320 may receive a control request for data processing of the corresponding module from any one of the function modules 200 . When the control request of the function module is received, the control right setting unit 320 dynamically allocates the control right to the multi-CPU module 100 with reference to the control right status information of the register 310 .

For example, when the control right for module 1 is set in the CPU module A, the control right status information of the register 310 records that the CPU module A is in a control right assignment impossible state, and the control right setting unit 320 assigns the control right Control rights can be assigned to the available CPU module (B) or CPU module (C).

In an embodiment of the present invention, the control right setting unit 320 may search for the multi-CPU module 100 to which the control right can be allocated with reference to the control right status information of the register 310 . In addition, a control right for the function module 200 may be set in a CPU module capable of assigning a control right among the multi-CPU modules 100 . When data processing is completed by the CPU module to which the control right is set, the control right setting unit 320 may release the control right of the corresponding CPU module.

Preferably, when the control right setting unit 320 sets the control right in the multi-CPU module 100 or releases the set control right, it may be reflected in the control right state information of the register 310 . That is, when the control right is set in the multi-CPU module 100, the control right setting status of the CPU module is reflected in the control right status information of the register 310, and as the data processing by the multi-CPU module is completed, the control right set in the CPU module is When released, the control right release status of the CPU module may be reflected in the control right status information of the register 310 .

4 is a flowchart of a control method of a PLC system having a multi-CPU module according to an embodiment of the present invention. Referring to FIG. 4 , first, the control right setting unit 320 determines whether a control request for data processing is received from the function module 200 ( S410 ).

In step S410, when the control request is received, the control right setting unit 320 checks the control right status information of the register (S420). As described above, the control right status information of the multi-CPU module is recorded in the register 310, and it can be determined whether there is a CPU module capable of assigning control right to the function module that has requested control by referring to the control right status information.

For example, when the control right for module 1 is set to the CPU module (A) among the multi-CPU modules and the control right is not assigned to the remaining CPU modules (B) and the CPU module (C), register 310 In the control right status information of the CPU module (A), the control right setting status for module 1 and the control right non-setting status of the CPU module (B) and the CPU module (C) may be recorded.

In addition, the multi-CPU module may be a CPU module having multiple cores. In this case, the control right setting state for each core of the CPU module may be recorded in the control right state information of the register 310 .

Next, it is determined whether the control right can be allocated to any one CPU module among the multi-CPU modules 100 with reference to the control right state information of the register (S430). For example, if control right for module 1 is set to CPU module (A) among multiple CPU modules and control right is not assigned to the remaining CPU modules (B) and CPU module (C), CPU module (B) ) and it can be determined that the control right can be assigned to the CPU module (C).

In another example, if the control right is assigned to all CPU modules and the control right assignment is not possible, steps (S420) to step (S420) until any one CPU module of the multi-CPU module completes data processing and is converted to a control right assignable state (S430) may be repeated. That is, the processing speed by the CPU module may be different depending on the type or size of data requested from the CPU module. Accordingly, when the control right of the CPU module that has completed data processing first among the multi-CPU modules is released and converted to a state in which the control right can be allocated, the control right for the next data processing can be allocated by referring to the control right status information in the register. Step S430 ), if control right assignment is possible to multiple CPU modules, the control right for the function module that requested control is assigned to the CPU module that can assign control right. In the above example in which the control right for module 1 is set to the CPU module (A) among the multiple CPU modules and the control right is not assigned to the remaining CPU modules (B) and CPU module (C), the control right setting unit 320 ) can assign control right to CPU module (B) or CPU module (C).

Finally, the CPU module to which the control right is set processes data according to the control request requested from the function module. To this end, the bus may transmit/receive data for data processing between the CPU module to which the control right is set and the function module requesting control. When data processing is completed by the CPU module to which the control right is set, the control right set in the corresponding CPU module is released (S440).

5 is a flowchart of a control method of a PLC system having a multi-CPU module according to another embodiment of the present invention. In more detail, in FIG. 5 , the process of step S440 of FIG. 4 will be described in more detail.

Referring to FIG. 5 , first, the control right setting unit 320 searches for a CPU module capable of setting the control right among the multi-CPU modules 100 by referring to the control right status information of the register 310 , and the CPU module (n) capable of setting the control right ) to set the control right (S510). As described above, in the control right state information of the register 310, a control right setting state for each of a plurality of CPU modules or a control right setting state of each core of a CPU module having a plurality of cores may be recorded. The control right setting unit 320 may search for a CPU module or a core of a CPU module to which control right assignment is possible with reference to the control right status information.

For example, when the control right for module 1 is set to only the CPU module (A) among the multi-CPU modules consisting of the CPU module (A), the CPU module (B) and the CPU module (C), the control right setting unit 320 sets the control right The control right can be set to the unset CPU module (B) or CPU module (C).

Then, the control right setting unit 320 reflects the control right assignment impossible state of the CPU module n in the control right state information of the register 310 (S520). That is, if the control right is set in any one CPU module n of the multi-CPU modules by step S510, the control right cannot be set in the CPU module n until the data processing is completed, so that by another function module Even if the control request is received, the control right assignment impossible state may be reflected so that the control right is not set in the CPU module n.

Then, the data is processed by the CPU module (n) (S530). More specifically, the CPU module n may process data of the function module that has requested control. To this end, data may be transmitted/received through a bus connecting the multi-CPU module and the function module.

Next, the control right setting unit 320 determines whether the CPU module n has completed data processing of the function module requesting control ( S540 ). As a result of the determination in step S540 , if the data processing is not completed, the control right setting unit 320 may maintain a standby state until the data processing is completed. To this end, when the data processing is completed, the CPU module n may notify the control right setting unit 320 that the data processing has been completed.

When the data processing by the CPU module n is completed as a result of the determination in step S540, the control right assignable state of the CPU module n is reflected in the control right status information of the register 310 (S550). That is, by step S540 , the control right release state of the CPU module n may be reflected in the control right setting information of the register. Accordingly, when a control request is received by another function module, the CPU module n may be searched for as a CPU module capable of assigning control rights.

In this way, by allocating the control right to the CPU module of the multi-CPU module by steps S510 to S550 or returning the control right of the CPU module that has completed data processing, the control right of the multi-CPU module can be dynamically allocated. have.

6 is a diagram showing a control right state for each CPU module according to an embodiment of the present invention. Referring to FIG. 6 , in the control device of a PLC system having a multi-CPU module of the present invention, after setting the control right to the CPU module A for module 1, when a control request is received from module 2, control right assignment is possible Control rights can be dynamically assigned to the CPU module (B).

When comparing FIG. 6 with FIG. 2, in the case of FIG. 2, only the CPU module (A) designated in advance has the control right for the modules 1 and 2, so the CPU module (B) is only the CPU module (A) even if it is not processing data. Data processing for modules 1 and 2 is performed. As described above, according to the conventional PLC system, since the control right for data processing of an unspecified module cannot be assigned to the CPU module B capable of data processing, resource allocation of multiple CPU modules is not efficient.

On the other hand, in the case of FIG. 6 , when a control request for data processing is received from the module 2, the control right may be set in the CPU module B capable of assigning the control right. In addition, when the data processing of the CPU module (A) or the CPU module (B) is completed, the control right is returned and can be used for data processing of other function modules. As described above, according to the present invention, the available resources of the PLC system can be efficiently allocated by dynamically allocating the control right to the multi-CPU module or returning the control right of the CPU module on which data processing has been completed.

As such, in a conventional PLC system having a multi-CPU module, only a pre-designated CPU module can have the control right of reading (READ) or writing (WRITE) for a specific function module, and an unspecified CPU module can I couldn't take control.

However, according to the present invention, the control right setting unit 320 does not set the control right to the CPU module designated in advance for the function module 200, but rather the resource distribution situation of the multi-CPU module 100 referenced from the register 310. Since the control right is dynamically allocated accordingly, the resources of the PLC system can be more efficiently distributed compared to the prior art.

For those of ordinary skill in the art to which the present invention pertains, various substitutions, modifications and changes are possible within the scope of the present invention without departing from the technical spirit of the present invention. is not limited by

Claims (6)

In the control device of a PLC system having multiple CPU modules,
a register in which control right state information of each of the multi-CPU modules is recorded;
When a control request for data processing of a function module is received, it is checked whether the control right is set in the first CPU module corresponding to the received control request among the multi-CPU modules by referring to the control right status information of the register, and the When the control right is set in the first CPU module, the control right is dynamically allocated to a second CPU module to which the control right is assignable among the remaining multi CPU modules except for the first CPU module among the multi CPU modules, and the second CPU a control right setting unit for setting the control right of the module; and
and a bus for transmitting and receiving data between the second CPU module and the function module according to the setting of the control right
Control unit of PLC system with multiple CPU modules.
According to claim 1,
The control right setting unit
Searching for at least one second CPU module capable of assigning control right by referring to the control right status information of the register, and setting the control right to a CPU module capable of assigning control right among the at least one second CPU module
Control unit of PLC system with multiple CPU modules.
3. The method of claim 2,
The control right setting unit
When data processing by the second CPU module is completed, the control right set for the function module is released.
Control unit of PLC system with multiple CPU modules.
4. The method of claim 3,
The control right setting unit
When the control right is set in the second CPU module, the control right setting status of the second CPU module is reflected in the control right status information of the register.
Control unit of PLC system with multiple CPU modules.
3. The method of claim 2,
The control right setting unit
When the control right set for the function module is released as data processing by the second CPU module is completed, the control right status information of the register reflects the control right release status of the second CPU module
Control unit of PLC system with multiple CPU modules.
According to claim 1,
The multi-CPU modules are
A CPU module having a single core is a CPU module having a plurality of modules or multiple cores
Control unit of PLC system with multiple CPU modules.

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