JP2008244522A - Communication adapter, central management system, control method and program of communication adapter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To centrally manage equipment even when a controlled device belonging to a control system having communication protocol and instruction command system different from those of a central management device is connected through a channel without requiring any consideration on the central management device side. <P>SOLUTION: A refrigerator adapter 5 transmits a command for setting control parameters to refrigerators 6A1 and 6A2, receives a response to the setting command from a controlled apparatus, determines whether the control parameters can be set or not based on the state of response, and stores control parameters which satisfy predetermined conditions more. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a communication adapter, a centralized management system, a communication adapter control method, and a control program, and more particularly to a communication adapter, a centralized management system, a communication adapter control method, and a control program used in a refrigeration system that performs centralized management.

A centralized management device (controller) that centrally controls refrigeration equipment sets a set value necessary for each operation to a large number of refrigeration equipment and controls operation of each refrigeration equipment ( For example, see Patent Document 1).
For example, in a store refrigeration centralized management system, a centralized management device, a showcase and a refrigerator are connected for the purpose of performing energy saving control, and optimal control of refrigerant discharge pressure of a compressor of the refrigerator is performed.
More specifically, the value on the low pressure side of the compressor (hereinafter referred to as the low pressure value) is controlled for the purpose of energy saving.
Japanese Patent Laid-Open No. 1-291085

By the way, in order to perform such energy-saving control, it is necessary to strictly control the control parameters of the refrigerator, and conventionally, only a refrigerator having the same centralized management device, communication protocol, and command command system is supported. There was a problem that could not.
Accordingly, the object of the present invention is to prevent the centralized management device from being conscious even when a controlled device belonging to a control system having a communication protocol and a command command system different from those of the centralized management device is connected via a communication path. It is another object of the present invention to provide a communication adapter, a centralized management system, a communication adapter control method, and a control program that enable centralized management.

In order to solve the above problems, a centralized management device and a communication adapter provided in a communication path between a centralized management device and a controlled device belonging to a control system having different communication protocols and command command systems, the communication adapter The adapter includes a command transmission unit that transmits a setting command for setting a control parameter of the controlled device to the controlled device, a response receiving unit that receives a response of the controlled device to the setting command, and a response state And a parameter storage unit that stores the control parameter that matches the predetermined condition more than the settable control parameter. Yes.
According to the above configuration, the command transmission unit of the communication adapter transmits a setting command for setting the control parameter of the controlled device to the controlled device.
The response receiving unit receives a response of the controlled device to the setting command.
As a result, the determination unit determines whether or not the control parameter can be set based on the response state of the controlled device, and the parameter storage unit selects a control parameter that matches the predetermined condition from among the control parameters that can be set. Remember.

In this case, a data conversion unit for converting the communication protocol and command system may be provided between the centralized management apparatus and the controlled apparatus.
In addition, the command transmission unit, when the control parameter has an upper limit value or a lower limit value, sequentially sets the control parameter from a predetermined initial value of the control parameter to an upper value or a lower value. The control command may be transmitted.
Further, the predetermined condition may be the control parameter for reducing power consumption.
The controlled device may be a refrigeration device including a compressor, and the control parameter may be a parameter related to a low pressure value of the compressor.

  A centralized management device; a controlled device controlled by the centralized management device; and a controlled device belonging to a control system having a communication protocol and a command command system different from at least the centralized management device among the controlled devices; A centralized management system including a communication adapter provided in a communication path between the communication adapter and the control adapter for the controlled device under control of the centralized management device. A command transmission unit that transmits a setting command for setting the control command, a response reception unit that receives a response of the controlled device to the setting command, a determination unit that determines whether the control parameter can be set based on a response state, and a setting A parameter storage unit that stores the control parameters that meet a predetermined condition among the possible control parameters; It is characterized by a door.

  A method of controlling a communication adapter provided in a communication path between a centralized management device and a controlled device belonging to a control system having a communication protocol and a command command system different from the centralized management device, the controlled device In response, a command transmission process for transmitting a setting command for setting the control parameter of the controlled apparatus, a response reception process for receiving a response of the controlled apparatus to the setting command, and the control parameter based on the response state. It is characterized by comprising: a determination process for determining whether setting is possible; and a parameter storage process for storing the control parameter that matches a predetermined condition among the control parameters that can be set.

The centralized management device and the centralized management device are control programs for controlling a communication adapter provided on a communication path between a controlled device belonging to a control system having a different communication protocol and command system by a computer. To send a setting command for setting a control parameter of the controlled device to the controlled device, receive a response of the controlled device to the setting command, and determine whether the control parameter can be set based on a response state And the control parameter that matches the predetermined condition among the control parameters that can be set is stored.
In this case, the control program may be recorded on a computer-readable recording medium.

  According to the present invention, even when a controlled device belonging to a control system having a communication protocol and a command command system different from that of the centralized management device is connected to the centralized management device, the centralized management device side is not aware of it. The centralized management apparatus can be controlled in the same manner as a controlled apparatus having the same communication protocol and command system.

Next, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a centralized management system for a refrigeration apparatus according to an embodiment.
The centralized management device system 100 is installed in a management center of a store chain such as a supermarket, and is a central management device 1 configured as a personal computer, and a main control device configured as a microcomputer installed in each store belonging to the store chain. (Centralized management device) 2, system control devices 3 </ b> A, 3 </ b> B that perform control for each system of the refrigeration system in each store, showcases 4 </ b> A to 4 </ b> C belonging to the system of the system control device 3 </ b> A, refrigerator adapter 5 (communication adapter) And the refrigerators 6A1 and 6A2, showcases 4D to 4F belonging to the system of the system control device 3B, and the refrigerators 6B1 and 6B2.
Here, the showcases 4A to 4F, the refrigerators 6A1 and 6A2, and the refrigerators 6B1 and 6B2 are provided with a terminal-side control device (not shown).
The refrigerator 6A1 and the refrigerator 6A2 belong to the same control system, and the refrigerator 6B1 and the refrigerator 6B2 belong to a control system different from the refrigerators 6A1 and 6A2 and to the same control system. Yes.

Here, belonging to the same control system means belonging to a control system having the same communication protocol and command system. In the present embodiment, the refrigerators 6A1 and 6A2 use a communication protocol and command system different from the communication protocol and command system used by the main controller 2, and the refrigerators 6B1 and 6B2 use the main controller. 2 uses the same communication protocol and instruction command system as the communication protocol and instruction command system used in FIG. The most prominent example in which such a situation occurs is when the refrigerators 6A1 and 6A2 and the refrigerators 6B1 and 6B2 are manufactured by different device manufacturers.
The chillers 6A1, 6A2, 6B1, and 6B2 are each provided with a watt hour meter W for measuring the power consumption of the corresponding chillers.

FIG. 2 is a schematic configuration block diagram of the central management apparatus.
The central management device 1 is connected to and controlled by a microcomputer 7 that controls the entire central management device 1, a hard disk (external storage device) 8 that is connected to the microcomputer 7 and stores various information, and a microcomputer 7. A ROM 9 for storing a program, a RAM 11 connected to the microcomputer 7 for temporarily storing various data, a disk drive 12 for reading / writing data to / from a flexible storage medium such as a removable storage medium, and the main controller 2 A communication interface unit 13 that performs communication with an external output device, an output interface unit 14 that performs an interface operation with an external output device, and an input interface unit 16 that performs an interface operation with an external input device. Yes.

Here, in the hard disk 8, in addition to the control program of the central management device 1 itself, various data sent from the main control device 2, data relating to installation forms (case layouts) such as showcases 4A to 4F described later, Furthermore, data regarding various operating conditions, communication protocols, and the like are stored.
The communication interface unit 13 is configured by a serial interface, for example, and is connected to the above-described main controller 2 via the communication line 17.
The output interface unit 14 is connected to a printer 18 and a display 19 as external output devices.
The input interface unit 16 is connected to a keyboard 21 and a mouse 22 as external input devices.

FIG. 3 is a schematic block diagram of the main controller.
As shown in FIG. 3, the main controller 2 includes a microcomputer 24 that controls the entire main controller 2, a ROM 26 and a RAM 27 connected to the microcomputer 24, communication interface units 28 and 29, and an output interface unit. 31 and an input interface unit 32, and an EEPROM 40 connected to the microcomputer 24.
The ROM 26 stores a communication protocol and a control program for the main controller 2 itself.
The RAM 27 temporarily stores various data sent from the external device, various data sent to the external device, and control data of the main control device 2 itself (for example, display data of a liquid crystal display unit 34 described later).

The communication interface units 28 and 29 are configured as a serial interface, for example. Here, the communication interface unit 28 is connected to the central management device 1 via the communication line 17, and the communication interface unit 29 is connected to the terminal side control device via the communication line 33A. Furthermore, the communication interface unit 29 has, for example, six communication ports, so that a maximum of six terminal-side control devices can be connected.
A liquid crystal display unit 34 and a buzzer 36 are connected to the output interface unit 31.

A key switch 37, a dip switch 38, and a slide switch 39 are connected to the input interface unit 32.
The key switch 37 is a switch for performing various settings and display commands to be described later.
The dip switch 38 is a switch for setting various states.
The slide switch 39 is a switch for performing settings related to illumination control and nighttime stop for the showcases 4A to 4F, which will be described later.
The EEPROM 40 is retained even when data relating to various settings and installation states of the showcases 4A to 4F, etc. are stored and the power is turned off.

FIG. 4 is a schematic configuration block diagram of the system control device.
As shown in FIG. 4, the system control devices 3A and 3B include a microcomputer 41 that controls the entire system control devices 3A and 3B, a ROM 42, a RAM 43, an EEPROM 45, and a communication interface unit 44 connected to the microcomputer 41. , 46, an output interface unit 47 and an input interface unit 48.

The ROM 42 stores communication protocols and control programs for the system control devices 3A and 3B themselves.
The RAM 43 stores various data sent from the terminal-side control device and data related to various operating conditions such as showcases 4A to 4F sent from the main control device 2.
The communication interface units 44 and 46 are configured by a serial interface, and the communication interface unit 44 is connected to the main control device 2, and the communication interface unit 46 includes the showcases 4A to 4F, the refrigerator adapter 5 and the refrigerators 6B1 and 6B2. The communication line 33 is connected.

The EEPROM 45 stores setting data of various operating conditions such as the showcases 4A to 4F sent from the main controller 2, and is retained even when the power is turned off.
The output interface unit 47 is connected to an LED display unit 51 that displays an alarm.
The input interface unit 48 performs an interface operation with the DIP switch 52.
The LED display unit 51 performs alarm display and operation monitor display.
The dip switch 52 is used to set the channel number assigned to use or not used for control of the showcases 4A to 4F and the like, and to its own A to E, or the LED display 51 is displayed as an alarm, Set to switch between operation monitor display.

FIG. 5 is a schematic block diagram of the refrigerator adapter.
The refrigerator adapter 5 is roughly divided into a microcomputer 61 for controlling the refrigerator adapter 5 as a whole, an SRAM 62 for temporarily storing various data, and various data such as a control program in a nonvolatile manner so that it can be updated. EEPROM 63 to perform, DIP switch 64 for performing various settings, LED display unit 65 for performing various displays such as status display, and communication terminal T1, and performs interface operation with system control device 3A A communication interface unit 66 and a communication interface unit 67 having a communication terminal T2 and performing an interface operation between the refrigerators 6A1 and 6A2 to be controlled are provided.

The microcomputer 61 stores the common data storage memory 71 that stores common data (control data) for centralized management, the communication protocol processing unit 72 that performs communication protocol control for the system control device 3A side, and the common data storage memory 71. The first data conversion processing unit 73 that converts the common data being converted into control data for the first refrigerator having the first communication protocol and the first command command system, and the first data conversion processing unit 73 The first communication protocol processing unit 74 that performs processing for communicating control data for the first refrigerator using the first communication protocol via the communication interface unit 67, and a common data stored in the common data storage memory 71 Converting the data into control data for the second refrigerator having the second communication protocol and the second command command system; A second communication protocol that performs processing for communicating the conversion data for the second refrigerator converted by the conversion processor 75 and the second conversion processor 75 using the second communication protocol via the communication interface 67. And a processing unit 76.
The communication interface unit 66 is connected to the system control device 3A via the communication terminal T1 and the communication line 33A.
The communication interface unit 67 is connected to the refrigerators 6A1 and 6A2 via the communication terminal T2 and the communication line 33B.

Next, a specific operation of the embodiment will be described.
Hereinafter, the refrigerators 6A1 and 6A2 will be described as having the first communication protocol and the first command command system.
FIG. 6 is a main flowchart of the refrigerator adapter at the time of changing the low pressure value (low pressure side set value) of the compressor of each refrigerator in the refrigeration system to which a plurality of refrigerators having different control systems are connected.
First, the refrigerator adapter 5 performs a process of automatically recognizing the settable range of the low pressure value of the refrigerator (step S100).
FIG. 7 is a process flowchart of the automatic recognition process of the settable range of the low pressure value of the refrigerator in the refrigerator adapter. In this case, the initial value of the low pressure value is assumed to be set in advance for all refrigerators.
First, the microcomputer 61 of the refrigerator adapter 5 sets the low pressure value from the initial value when the main controller 2 instructs the automatic recognition processing of the settable range of the low pressure value of the refrigerator through the system control device 3A. A change instruction for changing the minimum setting unit in a direction in which the value increases is performed (step S101).

Here, the operation of the refrigerator adapter 5 will be described in detail by taking the transmission of the change instruction as an example.
The microcomputer 61 of the refrigerator adapter 5 reads the common data (control data) for centralized management corresponding to the change command from the common data storage memory 71.
Then, the common data for centralized management corresponding to the read change command is output to the first data conversion processing unit 73.
As a result, the first data conversion processing unit 73 converts the input common data into control data for the first refrigerator having the first communication protocol and the first command command system, and the first communication protocol processing unit 74 Output to.
The first communication protocol processing unit 74 performs processing for communicating the control data for the first refrigerator converted by the first data conversion processing unit 73 using the first communication protocol, via the communication interface unit 67. For example, it transmits to refrigerator 6A1.
As a result, the refrigerator 6A1 responds to the refrigerator adapter 5 via the communication line 33B as to whether or not the low pressure value corresponding to the received low pressure value change instruction command can be set.

Here, the operation of the refrigerator adapter 5 will be described in detail by taking a response to the change instruction as an example.
When a response to the change instruction is transmitted from the refrigerator 6A1 via the communication line 33B and the communication interface unit 67, the first communication protocol processing unit 74 analyzes the response transmission and outputs the response transmission to the first data conversion processing unit 73. To do.
The first data conversion processing unit 73 refers to the common data storage memory 71 and converts the input control data for the first refrigerator having the first communication protocol and the first command command system into common data.
Thereby, the microcomputer 61 of the refrigerator adapter 5 determines whether or not the setting is impossible based on the response from the corresponding refrigerator 6A1 in response to the change instruction in step S101 (step S102).
If the setting is possible in the determination in step S102, the microcomputer 61 again moves the process to step S101 and performs the same process.
If it is determined in step S102 that setting is impossible, the microcomputer 61 stores the maximum low pressure value setting value that can be set in the EEPROM 63 as the low pressure upper limit value (step S103).

Next, the microcomputer 61 instructs the refrigerator 6A1 to change the low pressure value in the direction in which the value decreases from the initial value in the minimum setting unit in the same procedure as described above (step S104).
Subsequently, the microcomputer 61 determines whether or not setting is impossible based on the response from the corresponding refrigerator 6A1 in response to the change instruction in step S104 in the same procedure as described above (step S105). .
If the setting is possible in the determination in step S105, the microcomputer 61 moves the process again to step S101 and performs the same process.
If the setting is not possible in the determination in step S105, the microcomputer 61 stores the minimum low pressure value setting value that could be set in the EEPROM 63 as the low pressure lower limit value (step S106), and the process proceeds to the main process. To do.

FIG. 8 is a processing flowchart of automatic setting change width recognition processing for the low-pressure value of the refrigerator in the refrigerator adapter.
Next, the microcomputer 61 performs processing for automatically recognizing the setting change width of the low-pressure value of the refrigerator 6A1 (step S200).
First, the microcomputer 61 sets the low pressure value of the refrigerator 6A1 to the low pressure upper limit value stored in step S103 via the communication interface unit 67 (step S201).
Next, the microcomputer 61 sets the setting change width of the low pressure value in the refrigerator 6A1 to a value obtained by subtracting the low pressure lower limit value stored in step S106 from the low pressure upper limit value stored in step S103 (step S202).
Subsequently, the microcomputer 61 instructs the refrigerator 6A1 to change the low pressure value from the low pressure upper limit value to the setting change width value set in step S202 in the same procedure as described above (step S203).
Subsequently, the microcomputer 61 determines whether or not the setting is not possible based on the response from the corresponding refrigerator 6A1 in response to the change instruction in step S203 (step S204).

If it is determined in step S204 that setting is impossible, the microcomputer 61 decreases the current setting change width value by a predetermined minimum unit to obtain a new setting change width value (step S205), and the process is performed again. The process proceeds to step S203 and the same process is performed.
If it is determined in step S204 that the setting can be made, the microcomputer 61 stores the setting change width value that can be set as the maximum setting change width value in the EEPROM 63 (step S206), and the process proceeds to the main process. To do.

FIG. 9 is a process flowchart of the optimization process of the low-pressure value of the refrigerator in the refrigerator adapter.
Next, the low-pressure value optimization process of the refrigerator is performed (step S300).
First, the microcomputer 61 sets the low pressure value of the refrigerator 6A1 to the low pressure lower limit value stored in step S106 in the same procedure as described above (step S301).
Next, the microcomputer 61 acquires power consumption from the refrigerator 6A1 (step S302). Specifically, the power consumption is measured by the watt-hour meter W provided in the refrigerator 6A1, and the measurement result is notified.
Then, the microcomputer 61 newly sets the current low pressure value as a value larger by a predetermined value (step S303).

Next, the microcomputer 61 acquires the power consumption of the refrigerator 6A1 after the setting change (step S304).
Subsequently, the microcomputer 61 compares the power consumption of the refrigerator 6A1 before and after the setting change (step S305).
If the power consumption before the setting change is greater than the power consumption after the setting and the difference exceeds a predetermined threshold in the comparison in step S305, the microcomputer 61 proceeds to step S303. Thereafter, the same processing is repeated.

In the comparison in step S305, when the power consumption is approximately equal before and after the setting change, and the difference is equal to or smaller than the predetermined threshold value, the microcomputer 61 sets the value after the setting change to the optimum value of the refrigerator 6A1. Is stored in the EEPROM 63 (step S206), and the process proceeds to the main process.
Thereby, the microcomputer 61 performs the same process (steps S100, S200, S300) on the refrigerator 6A2 next, and ends the process.

As described above, according to the present embodiment, the refrigerator adapter 5 automatically reduces the low pressure values (upper limit value, lower limit value, setting change range, and optimum value) of the refrigerators 6A1 and 6A2 that are controlled devices. Can be obtained automatically and used for subsequent control.
Therefore, the main control device 2 and the system control device 3A can perform centralized management without being aware of the communication protocol and command command system of the connected refrigeration device. In other words, if the refrigerating apparatus belongs to a communication protocol and command command system that can be supported by the refrigerator adapter, centralized control is possible even if the refrigerating apparatus belongs to a communication protocol and command command system different from the self.

In the above description, the case of the low pressure value of the compressor has been described as the control parameter. However, it is possible to perform the centralized control by automatically setting other control parameters in the same manner. .
In the above description, the case where the refrigerators 6A1 and 6A2 belonging to the same communication protocol and instruction command system are connected to the refrigerator adapter 5 has been described. However, the communication protocols and command commands that the refrigerator adapter 5 can support. If it is a refrigeration apparatus belonging to a system, control is possible even when a plurality of refrigerators belonging to different communication protocols and command command systems are connected to the same communication line.

  In the above description, the case where the control program for realizing the above functions is stored in the EEPROM 63 has been described. However, the control program is recorded on a computer (CPU) readable recording medium, for example, communication When the microcomputer reads the program through the interface unit 66 and executes the process according to the read program, the same operations and effects as those of the above embodiments can be obtained.

Here, the storage medium is a semiconductor storage medium such as RAM or ROM, a magnetic storage type storage medium such as FD or HD, an optical reading type storage medium such as CD, CDV, LD, or DVD, or a magnetic storage type such as MO. / Optical reading type storage medium, and any storage medium can be used as long as it can be read by a computer regardless of electronic, magnetic, optical, etc. .
It is also possible to download, install, and execute a control program via a communication network such as the Internet or a LAN.

It is a centralized management system block diagram of the freezing apparatus of an embodiment. It is a general | schematic block diagram of a central management apparatus. It is a general | schematic block diagram of a main controller. It is a general | schematic block diagram of a system control apparatus. It is a general | schematic block diagram of a refrigerator adapter. It is a main flowchart of the refrigerator adapter at the time of the change of the low-pressure value (low-pressure side set value) of the compressor of each refrigerator in the refrigerating system to which a plurality of refrigerators of different control systems are connected. It is a process flowchart of the automatic recognition process of the settable range of the low voltage | pressure value of the refrigerator in a refrigerator adapter. It is a process flowchart of the setting change width | variety automatic recognition process of the low voltage | pressure value of the refrigerator in a refrigerator adapter. It is a process flowchart of the optimization process of the low voltage | pressure value of the refrigerator in a refrigerator adapter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Central management apparatus 2 Main control apparatus 3A, 3B System control apparatus 4A-4F Showcase 5 Refrigerator adapter (communication adapter)
6A1, 6A2 Refrigerator 6B1, 6B2 Refrigerator 61 Microcomputer 62 SRAM
63 EEPROM
64 DIP switch 65 LED display unit 66 Communication interface unit 67 Communication interface unit 71 Common data storage memory 72 Communication protocol processing unit 73 First data conversion processing unit 74 First communication protocol processing unit 75 Second conversion processing unit 76 Second communication protocol Processing unit 100 Centralized management system W Energy meter

Claims (8)

A centralized management device and a communication adapter provided in a communication path between a centralized management device and a controlled device belonging to a control system having a different communication protocol and command system,
The communication adapter is configured to send a setting command for setting a control parameter of the controlled device to the controlled device;
A response receiver for receiving a response of the controlled device to the setting command;
A determination unit for determining whether or not the control parameter can be set based on a response state;
Among the control parameters that can be set, a parameter storage unit that stores the control parameters that meet a predetermined condition, and
A communication adapter characterized by comprising: The communication adapter according to claim 1,
A communication adapter comprising a data conversion unit for converting the communication protocol and command system between the centralized management device and the controlled device. The communication adapter according to claim 1 or 2,
When the control parameter has an upper limit value or a lower limit value, the command transmission unit performs control for setting the control parameter to an upper value or a lower value sequentially from a predetermined initial value of the control parameter. A communication adapter characterized by sending a command. The communication adapter according to any one of claims 1 to 3,
The communication adapter according to claim 1, wherein the predetermined condition is the control parameter for reducing power consumption. The communication adapter according to any one of claims 1 to 4,
The controlled device is a refrigeration device including a compressor,
The communication adapter, wherein the control parameter is a parameter relating to a low pressure value of the compressor. Between a centralized management device, a controlled device controlled by the centralized management device, and a controlled device belonging to a control system having a communication protocol and a command command system different from at least the centralized management device among the controlled devices A centralized management system comprising a communication adapter provided in the communication path of
The communication adapter is configured to transmit a setting command for setting a control parameter of the controlled device to the controlled device under the control of the centralized management device;
A response receiver for receiving a response of the controlled device to the setting command;
A determination unit for determining whether or not the control parameter can be set based on a response state;
Among the control parameters that can be set, a parameter storage unit that stores the control parameters that meet a predetermined condition, and
Centralized management system characterized by having A method of controlling a communication adapter provided in a communication path between a centralized management device and a controlled device belonging to a control system having a different communication protocol and command command system from the centralized management device,
A command transmission process for transmitting a setting command for setting the control parameter of the controlled device to the controlled device;
A response receiving process of receiving a response of the controlled device to the setting command;
A determination process for determining whether the control parameter can be set based on a response state;
A parameter storage process for storing the control parameter that matches a predetermined condition from among the control parameters that can be set;
A method for controlling a communication adapter, comprising: A control program for controlling a communication adapter provided in a communication path between a centralized management device and the controlled device belonging to a control system having a different communication protocol and command command system by a computer,
Causing the controlled device to transmit a setting command for setting the control parameter of the controlled device;
Receiving a response of the controlled device to the setting command;
Based on the response state, whether to set the control parameter is determined,
Of the control parameters that can be set, the control parameters that match a predetermined condition are stored.
A control program characterized by that.

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