WO2015140910A1 - プログラマブルロジックコントローラ - Google Patents
プログラマブルロジックコントローラ Download PDFInfo
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- WO2015140910A1 WO2015140910A1 PCT/JP2014/057181 JP2014057181W WO2015140910A1 WO 2015140910 A1 WO2015140910 A1 WO 2015140910A1 JP 2014057181 W JP2014057181 W JP 2014057181W WO 2015140910 A1 WO2015140910 A1 WO 2015140910A1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/14—Plc safety
- G05B2219/14008—Pc monitors plc
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- This invention relates to the programmable logic controller which transmits the device data hold
- a PLC programmable logic controller
- a controlled device such as an industrial machine
- a PLC controls the controlled device by reading / writing each device data according to a sequence program which is a program created by the user.
- a technique is generally known in which the value of each device data is transmitted to a PC (personal computer) and the change or state of each device is displayed on a display device such as a PC.
- the device data value to be transmitted includes device data that has not changed from the previously transmitted device data value. Transmission of device data with no change in value is useless in a system that displays the state of data, and causes an increase in communication load. For this reason, in order to reduce the communication load, a method is used in which the value of the device data transmitted last time is compared with the value of the device data transmitted this time, and only the device data whose value has changed is transmitted (for example, Patent Documents 1, 2, and 3).
- the present invention has been made in view of the above, and a programmable logic controller capable of efficiently transmitting data even when there is a request for transmitting device data collected three times or more within a polling time.
- the purpose is to obtain.
- the programmable logic controller of the present invention includes a data collection processing unit that collects device data according to the state of the controlled device from the controlled device, and the device data
- a data collection processing unit that collects device data according to the state of the controlled device from the controlled device, and the device data
- the device data When receiving a device data transmission request in a polling manner from a storage unit that stores change information regarding changed device data and a display device that displays the status of the controlled device, the change information or the collected device data
- a communication processing unit that transmits the device data to the display device, and the data collection processing unit collects the device data three times or more within one polling time, Compare the acquired device data with the device data acquired this time. The total amount of the change information is compared with the total amount of the collected device data when the change information or the collected device data is transmitted to the display device for each polling.
- the collected device data is restored from the change information, and the communication processing unit determines that the total amount of the change information is If the total amount of the collected device data is greater than or equal to, the restored device data is transmitted to the display device, and the total amount of the change information is smaller than the total amount of the collected device data.
- the change information in the storage unit is transmitted to the display device.
- FIG. 1 is a diagram showing a configuration of a PLC according to an embodiment of the present invention.
- FIG. 2 is a flowchart showing an operation procedure of the PLC according to the embodiment.
- FIG. 3 is a sequence diagram showing an operation procedure of the PLC according to the embodiment.
- FIG. 4 is a diagram for explaining changes in device data.
- FIG. 5 is a diagram for explaining acquired data and data to be stored.
- FIG. 1 is a diagram showing a configuration of a PLC according to an embodiment of the present invention.
- the control system 100 includes a PLC (programmable logic controller) 10, a PC (personal computer) 20, and a controlled device 40.
- the PLC 10 is connected via a communication cable 30 to a device (display device) that can display data, such as the PC 20.
- the device to which the PLC 10 is connected is not limited to the PC 20 and may be another device.
- the PLC 10 is connected to a controlled device 40 such as an industrial machine via a communication cable 31.
- the PLC 10 is an apparatus that controls the controlled device 40 and holds data related to the controlled device 40 (hereinafter referred to as device data) that changes in accordance with the operation (state) of the controlled device 40.
- the PLC 10 transmits device data to the PC 20 in response to a request from the PC 20.
- the PLC 10 which is a single device executes control of the controlled device 40, processing of a plurality of device data, and transmission to the device data to the PC 20.
- the device indicates an element of alphabet notation used in the ladder program of the PLC 10.
- the PC 20 displays the status and the like of the controlled device 40 by displaying the change and status of the device data.
- the PC 20 acquires device data from the PLC 10 by transmitting a data acquisition request to the PLC 10.
- the PLC 10 acquires and accumulates a plurality of device data multiple times within a polling time interval.
- the PLC 10 of the present embodiment compares the device data values for each device data even when the device data transmission request acquired three times or more within one polling time is received from the PC 20. Only the device data whose value has changed is transmitted to the PC 20.
- the PLC 10 according to the present embodiment compares the device data values for each device data even if the device data changes a plurality of times within one polling time. Only those whose values have changed (change data) are transmitted to the PC 20.
- the PLC 10 includes an arithmetic processing unit 14, an internal device (device memory) 15, a data collection processing unit 16, and a communication processing unit 17.
- the arithmetic processing unit 14 performs various determination processes according to an operation (instruction) from the user.
- the internal device 15 is a storage device (storage unit) used in the arithmetic processing of the arithmetic processing unit 14. Further, device data acquired from the controlled device 40 is stored in the internal device 15.
- the internal device 15 has a capacity for storing data. In the present embodiment, data stored in the internal device 15 is referred to as device data.
- the data collection processing unit 16 collects device data from the controlled device 40 at a predetermined interval (for example, every scan time), and stores the value of the device data in the internal device 15.
- the data collection processing unit 16 of the present embodiment compares the device data acquired last time with the device data acquired this time, and the device data changed only when the device data has changed. Is stored in the internal device 15.
- the data collection processing unit 16 compares the total amount of all acquired device data with the total amount of changed device data, and sets the data with the smaller total amount as a transmission target to the PC 20.
- the communication processing unit 17 transmits / receives various data to / from the PC 20.
- the communication processing unit 17 receives a device data transmission request from the PC 20 and transmits the device data to the PC 20.
- FIG. 1 demonstrated the case where the number of the controlled devices 40 connected to PLC10 was one, you may connect the some controlled device 40 with respect to PLC10.
- the PLC 10 collects device data from the plurality of controlled devices 40 and transmits the collected device data to the PC 20.
- the PLC 10 includes an internal device 15 corresponding to the controlled device 40 for each controlled device 40.
- Each internal device 15 has a capacity for storing device data of the controlled device 40.
- the PLC 10 stores the acquired device data in the corresponding internal device 15.
- FIG. 2 is a flowchart showing an operation procedure of the PLC according to the embodiment.
- FIG. 3 is a sequence diagram showing an operation procedure of the PLC according to the embodiment. 2 and 3 show operation procedures of the PLC 10 and the PC 20 when the PC 20 monitors device data (mobile data).
- the PLC 10 collects device data from the controlled device 40 when controlling the controlled device 40 (step S1). Specifically, the data collection processing unit 16 collects device data from the controlled device 40 and stores it in the internal device 15.
- the data collection processing unit 16 acquires device data Z1 to Z4 from the controlled device 40 every scan (once per scan). Therefore, the data collection processing unit 16 sequentially acquires device data over three times within one polling time by the PC 20.
- the data collection processing unit 16 acquires device data Z1 at the time of the first scan (timing t1), and acquires device data Z2 at the time of the second scan (timing t2). Further, the data collection processing unit 16 acquires device data Z3 at the time of the third scan (timing t3), and acquires device data Z4 at the time of the fourth scan (timing t4). The data collection processing unit 16 stores the acquired device data Z1 to Z4 in the internal device 15.
- the data collection processing unit 16 acquires device data Z1 to Z4 from the controlled device 40 for each scan.
- device data Z1 to Zn n is a natural number of 2 or more
- the data acquired during the first scan is the device data acquired this time .
- the data acquired at the next scan is the device data acquired this time
- the data acquired at the previous scan is the device data acquired last time.
- the scan data acquired last time is scan data acquired immediately before the scan data acquired this time.
- device data Zm is acquired at the m-th scan (m is a natural number from 1 to n) and device data Z (m + 1) is acquired at the (m + 1) -th scan.
- the device data Zm is the device data acquired this time.
- the device data Zm is the device data acquired last time
- the device data Z (m + 1) is the device data acquired this time.
- the data acquired in the second scan is the device data acquired last time
- the data acquired in the third scan is the device data acquired this time.
- the data collection processing unit 16 compares the device data acquired last time with the device data acquired this time, and only changes the device data when the device data changes. Save to device 15.
- the data collection processing unit 16 compares the device data Z1 and the device data Z2, and saves the device data Z2 that is the newer device data in the internal device 15 if the two values are different. Further, when both are the same value, the data collection processing unit 16 deletes the newer device data Z2 and keeps the older device data Z1 in the internal device 15.
- the data collection processing unit 16 adds device information that can identify the acquisition source device (controlled device 40) and timing data indicating the changed timing to the changed device data.
- the device data and timing data added to the changed device data is referred to as changed data.
- the polling method is a method in which the PC 20 requests the PLC 10 to transmit data at a predetermined time interval, and the PLC 10 transmits data to the PC 20 in response to the request.
- the PC 20 sends a device data transmission request X1 to the PLC 10 (step S3).
- the PLC 10 receives the device data transmission request X1 (step S4).
- the PLC 10 sends response data Y1 corresponding to the transmission request X1 to the PC 20.
- the response data Y1 here is device data acquired from the controlled device 40.
- the data amount of the change data may be larger than the total amount of all the device data Z1 to Z4. For example, when the acquired device data changes more frequently than the previously acquired device data, the data amount of the changed data may be larger than the total device data.
- the data collection processing unit 16 compares the total data amount of the device data Z1 to Z4 with the data amount (total amount) of the change data (step S5). At this time, the data collection processing unit 16 calculates the number of times device data is acquired (here, four times) based on the polling time T and the scan time. Then, the data collection processing unit 16 calculates the total data amount based on the calculated number of times. The calculated number of times is used to grasp how many times the data amount should be summed. If the number of times device data is acquired is known, the total data amount can be obtained by integrating one device data capacity (capacity ⁇ number of times). Therefore, the data collection processing unit 16 calculates the total data amount using the calculated number of times. The data collection processing unit 16 selects data having a smaller data amount out of the total amount of change data and the total data amount of the device data Z1 to Z4.
- the data collection processing unit 16 sets the change data as a transmission target to the PC 20 (step S6). .
- the data collection processing unit 16 sets all the device data Z1 to Z4 as transmission targets to the PC 20 (step S7). In this case, the data collection processing unit 16 derives the value of the device data that has not changed and its timing based on the timing data.
- the data collection processing unit 16 restores the unsaved device data based on the device data immediately before the unsaved device data. Specifically, the second acquired device data is restored based on the change data corresponding to the second acquired device data and the first acquired device data. Thereafter, the third acquired device data is restored based on the change data corresponding to the third acquired device data and the second acquired device data. Thus, the (L + 1) th device data is restored based on the (L) th (L is a natural number) device data. Then, the data collection processing unit 16 restores the device data that has not been saved based on the derivation result. As a result, the data collection processing unit 16 creates all device data Z1 to Z4 that are transmission data to the PC 20.
- the transmission target (device data) set by the data collection processing unit 16 is transmitted to the PC 20 as response data Y1 by the communication processing unit 17 of the PLC 10 (step S8). And the polling between PLC10 and PC20 is complete
- the PC 20 acquires device data (change data or all device data) from the PLC 10, thereby monitoring the internal device 15 of the PLC 10 and displaying the device data.
- device data change data or all device data
- each of the device data Z1 to Z4 may include a plurality of types of data.
- the data collection processing unit 16 transmits either change data or all device data to the PC 20 as response data Y1 for each type of data.
- FIG. 4 is a diagram for explaining changes in device data.
- the device data Z1 is data 1A, 1B, 1C
- the device data Z2 is data 2A, 2B, 2C
- the device data Z3 is data 3A, 3B, 3C
- the device data Z4 is data 4A, 4B, 4C.
- data A changes to data 1A to 4A
- data B changes from data 1B to 4B
- data C changes from data 1C to 4C.
- each value of the data 1A, 2A, 3A is 100, and the value of the data 4A is 120.
- the data A does not change between the device data Z1 to Z3 but changes in the device data Z4.
- FIG. 5 is a diagram for explaining acquired data and data to be stored.
- FIG. 5 shows the acquisition data 101 that the data collection processing unit 16 acquires from the controlled device 40 and the storage data 102 that the data collection processing unit 16 stores in the internal device 15.
- the data collection processing unit 16 of the PLC 10 receives the value of data A as the acquired data 101 from the controlled device 40. Since the data collection processing unit 16 acquires four device data of the device data Z1 to Z4, the data collection processing unit 16 also acquires four values as the data A value.
- the data collection processing unit 16 stores only the value (100) of the data A1 and deletes the value of the data A2.
- the data collection processing unit 16 adds device information and timing data to the value of the data A1. For example, the data collection processing unit 16 adds “data A” information as device information to the value of the data A1, and adds “t1” information indicating the timing t1 as timing data.
- the data collection processing unit 16 deletes the value of the data A3. If the data A1 and the data A4 are different values, the data collection processing unit 16 stores the value (120) of the data A4. When storing the value of the data A4, the data collection processing unit 16 adds device information and timing data to the value of the data A4. For example, the data collection processing unit 16 adds “data A” information as device information to the value of the data A4, and adds “t4” information indicating the timing t4 as timing data. The data collection processing unit 16 causes the internal device 15 to store storage data (change information) 102 to which device information and timing data are added.
- the total amount of device data acquired as data A is the total data amount of acquired data 101.
- the changed total amount of device data is the total data amount of the stored data 102.
- the data collection processing unit 16 sets the data having the smaller data amount of the acquired data 101 and the stored data 102 as a transmission target to the PC 20.
- the data collection processing unit 16 sets the data having the smaller data amount among the acquired data B and the stored data as a transmission target to the PC 20. In addition, the data collection processing unit 16 sets data having a smaller data amount among the acquired data of the data C and the stored data as a transmission target to the PC 20.
- the PLC 10 transmits only the device data whose value has changed to the PC 20. Further, the PLC 10 compares the data amount of change data with the data amount of all device data, and switches the data to be transmitted based on the size of the data amount. Thereby, the communication load of the device data by PLC10 can be reduced. Therefore, loss of device data to be transmitted can be prevented, and influence on other functions controlled by the PLC 10 can be prevented.
- the communication processing is more burdensome than when transmitting one device data.
- the PLC 10 transmits only the device data whose value has changed to the PC 20, so that the data transmission efficiency is improved. Is possible.
- the data collection processing unit 16 may omit adding device information or timing data to the changed device data. Good.
- the PLC 10 since the PLC 10 transmits the change data among the device data to the PC 20, even when the device data is collected three times or more within the polling time, the data can be efficiently transmitted. become.
- the data to be transmitted is switched to either change data or all device data based on the amount of data, the communication load of device data can be reduced.
- device data is collectively transmitted to the PC 20, data transmission can be performed more efficiently than when device data request (reception) and response (transmission) are repeated.
- the programmable logic controller and the control method according to the present invention are suitable for transmitting device data.
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Abstract
Description
図1は、本発明の実施の形態に係るPLCの構成を示す図である。制御システム100は、PLC(プログラマブルロジックコントローラ)10と、PC(パーソナルコンピュータ)20と、被制御機器40とを有している。PLC10は、PC20などのデータ表示を行うことができる装置(表示装置)に通信ケーブル30を介して接続されている。なお、PLC10が接続される装置は、PC20に限らず、他の装置であってもよい。
Claims (6)
- 被制御機器の状態に応じたデバイスデータを前記被制御機器から収集するデータ収集処理部と、
前記デバイスデータのうち変化したデバイスデータに関する変化情報を記憶する記憶部と、
前記被制御機器の状態を表示する表示装置からポーリング方式で前記デバイスデータの送信要求を受けると、前記変化情報または前記収集されたデバイスデータを前記表示装置に送信する通信処理部と、
を備え、
前記データ収集処理部は、
1回のポーリング時間内に前記デバイスデータを3回以上に渡って収集するとともに、各収集の際に、前回取得したデバイスデータと今回取得したデバイスデータとを比較し、異なる場合には前記変化情報を生成して前記記憶部に記憶させ、各ポーリングに対して前記変化情報または前記収集されたデバイスデータを前記表示装置に送信する際に、前記変化情報の合計量と前記収集したデバイスデータの合計量とを比較し、前記変化情報の合計量が、前記収集したデバイスデータの合計量以上の場合には、前記変化情報から前記収集したデバイスデータを復元し、
前記通信処理部は、
前記変化情報の合計量が、前記収集したデバイスデータの合計量以上の場合には、復元されたデバイスデータを前記表示装置に送信し、前記変化情報の合計量が、前記収集したデバイスデータの合計量よりも少ない場合には、前記記憶部内の前記変化情報を前記表示装置に送信することを特徴とするプログラマブルロジックコントローラ。 - 前記データ収集処理部は、
前記変化情報の変化したタイミングを示すタイミングデータに基づいて、前記変化情報から前記収集したデバイスデータを復元することを特徴とする請求項1に記載のプログラマブルロジックコントローラ。 - 前記被制御機器の制御と、前記デバイスデータまたは前記変化情報の前記表示装置への送信と、を1台構成の装置によって実行することを特徴とする請求項1または2に記載のプログラマブルロジックコントローラ。
- 前記データ収集処理部は、前記表示装置から前記デバイスデータの送信要求があると、前記比較の処理を実行するとともに、前記変化情報の合計量が、前記収集したデバイスデータの合計量以上の場合には、前記変化情報から前記収集したデバイスデータを復元し、
前記通信処理部は、前記表示装置から前記デバイスデータの送信要求があった場合に、前記デバイスデータまたは前記変化情報の前記表示装置への送信を実行することを特徴とする請求項1から3のいずれか1つに記載のプログラマブルロジックコントローラ。 - 前記データ収集処理部は、
前記各収集の際に、前回取得したデバイスデータと今回取得したデバイスデータとを比較し、同じ場合には前記デバイスデータを記憶させず、異なる場合には前記変化情報を生成して前記記憶部に記憶させることを特徴とする請求項1から4のいずれか1つに記載のプログラマブルロジックコントローラ。 - 前記データ収集処理部は、記憶させなかったデバイスデータの1つ前のデバイスデータと、前記記憶させなかったデバイスデータに対応する変化情報とに基づいて、前記収集したデバイスデータを復元することを特徴とする請求項5に記載のプログラマブルロジックコントローラ。
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JP2015520746A JP5864032B1 (ja) | 2014-03-17 | 2014-03-17 | プログラマブルロジックコントローラ |
KR1020167001180A KR101627081B1 (ko) | 2014-03-17 | 2014-03-17 | 프로그래머블 로직 컨트롤러 |
PCT/JP2014/057181 WO2015140910A1 (ja) | 2014-03-17 | 2014-03-17 | プログラマブルロジックコントローラ |
CN201480042296.1A CN105408824B (zh) | 2014-03-17 | 2014-03-17 | 可编程逻辑控制器 |
DE112014003067.8T DE112014003067T5 (de) | 2014-03-17 | 2014-03-17 | Speicherprogrammierbare Steuerung |
US14/906,007 US9921564B2 (en) | 2014-03-17 | 2014-03-17 | Programmable logic controller |
TW103124365A TWI525408B (zh) | 2014-03-17 | 2014-07-16 | 可程式邏輯控制器 |
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- 2014-03-17 KR KR1020167001180A patent/KR101627081B1/ko not_active IP Right Cessation
- 2014-03-17 JP JP2015520746A patent/JP5864032B1/ja active Active
- 2014-03-17 DE DE112014003067.8T patent/DE112014003067T5/de active Pending
- 2014-03-17 US US14/906,007 patent/US9921564B2/en active Active
- 2014-03-17 WO PCT/JP2014/057181 patent/WO2015140910A1/ja active Application Filing
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JPH0695718A (ja) * | 1992-09-11 | 1994-04-08 | Omron Corp | プログラマブル・コントローラのリモートi/oシステム |
JP2000165965A (ja) * | 1998-11-25 | 2000-06-16 | Kubota Corp | 作業車用の制御装置 |
JP2003280732A (ja) * | 2002-03-20 | 2003-10-02 | Digital Electronics Corp | データ伝送装置、および、それを用いた制御システム |
JP2007249759A (ja) * | 2006-03-17 | 2007-09-27 | Toshiba Corp | 監視システム |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6563155B1 (ja) * | 2018-10-15 | 2019-08-21 | 三菱電機株式会社 | プログラマブルロジックコントローラ、外部機器、方法、及びプログラム |
US11467990B2 (en) | 2018-10-15 | 2022-10-11 | Mitsubishi Electric Corporation | Programmable logic controller, external apparatus, method, and recording medium |
Also Published As
Publication number | Publication date |
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KR101627081B1 (ko) | 2016-06-03 |
CN105408824A (zh) | 2016-03-16 |
JP5864032B1 (ja) | 2016-02-17 |
JPWO2015140910A1 (ja) | 2017-04-06 |
DE112014003067T5 (de) | 2016-03-17 |
KR20160011237A (ko) | 2016-01-29 |
TW201537313A (zh) | 2015-10-01 |
CN105408824B (zh) | 2017-07-04 |
US9921564B2 (en) | 2018-03-20 |
US20160170398A1 (en) | 2016-06-16 |
TWI525408B (zh) | 2016-03-11 |
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