JPH05304695A - Programmable controller - Google Patents

Abstract

PURPOSE:To speed transmission data processing by collecting collected control signals or information signals and automatically updated transmission station data in time series at its storage. CONSTITUTION:The programmable controller is provided with a common memory function 11, scanning function 12, I/O interface function 13, register table function 15, data buffer function 16, and data collection function 17. The function 11 stores transmission station data exchanged with the other transmission station through the data transmission line, and the function 12 collects them periodically to make an automatic updating. The function 13 exchanges control signals or collection signals with the processor being an object to be controlled, and the function 15 collects them periodically. The function 16 stores and keeps control or information signals. Further, the function 17 collects the signals stored and held by the function 16 and the data updated by the function 12 in time series at its storage. The data to be collected is selected from a scanning memory to be sent to the monitor in a batch by means of a controller. The event analysis is performed to make the high-speed processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable controller device used in a control system in which a plurality of transmission stations are connected by a data transmission line.

[0002]

2. Description of the Related Art A process control system for controlling, monitoring, and managing a process mainly comprises a monitoring device and a controller.

The monitoring device and the controller are connected by a data transmission line, and process information is sent from the controller to the operator via the monitoring device.

As a transmission method, message transmission in which data is transferred between 1: 1 and 1: N, and scan transmission in which each transmission station has a common memory for transmission and data is transferred between N: N There is.

In the scan transmission, the transmission station voluntarily executes the broadcast communication at a fixed cycle and automatically updates the contents of the common memory in each transmission station. This common memory for transmission is called a scan memory, and each transmission station has a transmission area and a reception area. Process information is mainly sent from the controller to each transmission station by this scan transmission.

Unlike scan transmission, message transmission is used when an event occurrence is instantly notified to a specific party at the same time as incidental information, or when a large amount of information such as a program is divided and sent.

In such a process control system, the function of collecting and editing process data is an important element of data processing functions such as process monitoring, production / brand management, and controller control performance analysis. It is one.

As a method of incorporating this data collection function into a control system, the following has been conventionally used depending on where the function is added to the system. (1) Install a dedicated data logging device separately from the controller.

(2) Input / output data and the like between the controller and the process transmitted from the controller by scan transmission are collected in another transmission station.

In this case, as the other transmission station, a monitoring device such as an operator console, a database station, a host process computer connected by a gateway is generally used.

(3) The controller collects the internal data by itself and sends it to the monitoring device after the collection is completed.

[0012]

The three conventional methods have the following problems.

(1) Dedicated data logging device When a dedicated data logging device is used, it is necessary to install a dedicated transmission line between the device and the plant. Sex decreases. Further, since the transmission line is not connected to the monitoring device, there are problems such as poor operability and difficult maintenance.

(2) Collecting by the monitoring device based on the scan data The method of collecting and editing the data transmitted by the scan transmission from the controller at the monitoring device or the like at a constant cycle does not have a high processing efficiency as a system. There is a problem.

In order to collect the time-series data from the scan memory, it is necessary for the monitoring device to collect the data at the same cycle as the transmission speed, which increases the load on the monitoring device that does not require a high-speed processing cycle. Will end up.

In particular, in a monitoring device in which data processed at high speed by a plurality of controllers is managed by one unit, when collecting data other than normal monitoring information, the processing efficiency of the monitoring device is high. Will be reduced.

(3) When the controller collects data by itself When collecting data by the controller itself, generally only the data inside the controller is targeted for collection. Therefore, when a plurality of controllers cooperate to control one process, it is necessary to download the data collected by each controller to the monitoring device and then edit the data of each controller. further,
In such a case, information for matching the timing of the data collected by each controller is required.

Further, when the loads of a plurality of controllers are not constant, it is not a good idea to add a collecting function to a high-load controller in consideration of the performance of the controllers.

[0019]

SUMMARY OF THE INVENTION The present invention has a common memory function for storing and holding transmission station data transferred to and from another transmission station via a data transmission path, and a common memory function for storing and holding the same. A scan function for periodically collecting and automatically updating the transmission station data, an I / O interface function for exchanging control signals or information signals with a process device to be controlled, and a periodic control signal or information signal Automatically by the registration table function that collects automatically, the data buffer function that stores and holds the control signal or information signal collected by this registration table function, and the control signal or information signal and the scan function that is stored and held by this data buffer function. And a data collection function for collecting and storing updated transmission station data in time series. The programmable controller device,
And a programmable controller device having a batch transmission function of collectively transmitting a control signal, an information signal, or transmission station data to another transmission station in response to a data transmission request from another transmission station.

[0020]

In the programmable controller device of the present invention, the transmission station data transferred to and from another transmission station via the data transmission path is stored and held, and the transmission station data stored and held by the common memory function is periodically stored. Control signals or information signals are exchanged with the process device to be controlled, the control signals or information signals are periodically collected, and the control signals collected by the registration table function or Information signals are stored and held, and control signals or information signals stored and held by the data buffer function and transmission station data automatically updated by the scan function are collected in time series and stored and held.

Then, in response to a data transmission request from another transmission station, control signals or information signals or transmission station data are collectively transmitted to the other transmission station.

[0022]

EXAMPLE An example of the present invention will be described below. In FIG. 1 and FIG. 2, 11 is a common memory function for storing and holding transmission station data transferred between other transmission stations via the data transmission path 10, and 12 is a transmission stored and held by the common memory function 11. A scan function that periodically collects station data and automatically updates it, 13 is an I / O interface function that sends and receives control signals or information signals to and from the process device 14 that is a control target, and 15 is a control signal or information signal Registration table function that collects information periodically 1
6 is a data buffer function for storing and holding control signals or information signals collected by the registration table function 15.
Reference numeral 7 denotes a data collection function that collects the control signal or information signal stored and held by the data buffer function and the transmission station data automatically updated by the scan function in time series and stores and holds the data.

Further, in this embodiment, a programmable controller device having a batch transmission function for collectively transmitting control signals or information signals or transmission station data to another transmission station in response to a data transmission request from another transmission station. It can also be

That is, in the present embodiment, in a control system in which a plurality of transmission stations are connected via the data transmission line 10, data is transmitted between other transmission stations connected via the data transmission line 10. A controller that has a common memory for handing over, has a transmission (scan transmission) function to automatically update the contents of the common memory in each transmission station by voluntarily executing broadcast communication at each transmission station at fixed intervals. It has a registration table for registering the information necessary to collect data in a fixed cycle and a data buffer necessary for storing and holding the collected data, and the internal data of the controller including the data in the common memory. A program with a data collection function, which collects data in a predetermined cycle and collects and holds the data collected in time series. It is a Bull controller.

Then, a function of registering the addresses to be collected on the common memory with other transmission stations in the controller, and a record for recording the information specified from the common memory on the transmission in time series according to the registration Has a function and
Any data other than that of the own station can be recorded as long as it is data in the common memory for transmission.

That is, in the process control system, the programmable controller and the monitoring device are connected by a data transmission line, and the controller is the CPU 21,
The ROM 22 and 23, the RAM 24, the input / output interface 25, and the transmission interface 26.

A system program 31, which manages control of the entire controller, an input / output program 32, which executes data input / output, a data collection execution program 33, which executes data collection, and the collected data, etc., are transferred to the ROM.
It includes a data transfer / transmission program 34 for transmission, a processing program for determining the load of the operating state of the controller, and the like.

The RAM includes a user-defined application program 35, input / output configuration information 36, a collection data registration table 15 indicating collection targets, input / output data 37, a buffer memory 16 for storing collection data, and the like.

Further, in the above controller, in response to a data transmission request from another transmission station input via the data transmission line, the collected data stored and held are collectively transmitted to the other transmission station via the data transmission line. A programmable controller with a data collection function that has a transmission function can be used.

The data to be collected in the monitoring device is selected from the scan memory. Each controller sets the amount of task currently being executed in the scan memory and notifies the monitoring device. The monitoring device transmits the registration information to the controller with the lowest load among the controllers.

The controller receiving the registration information collects necessary data from the scan memory based on the registration information.

After a certain event is detected and the collection is completed, the collected information is collectively transmitted to the monitoring device. The monitoring device that receives the collected data collectively stores the collected data in a database or the like, displays it as a trend or the like on the screen of the monitoring device when necessary, and uses it for event analysis.

Common memory for transmission (scan memory)
The following effects are provided in the embodiment because the data is collected by the controller and the controller collects the data.

(1) Centralization of data collection In a distributed control system in which one plant is controlled by a plurality of controllers, even if information necessary for event analysis is distributed to a plurality of controllers,
Since the data can be collected by the controller at the location, it is not necessary to re-edit the data by the monitoring device.

Further, since the necessary information is not divided into a plurality of data groups (files), the data can be easily managed.

(2) Load distribution Among the plurality of controllers, a controller with a light load can be applied to collect data, so that the load on the system can be made uniform and data can be collected at high speed. ..

(3) Widening of collection target Since various data other than the controller data can be collected, various application examples are possible.

For example, when the controller and I / O are separated on the transmission path, I / O data can be directly collected from the scan memory.

Further, if the information transmitted by the monitoring device is a collection target and the information is used as a start / end condition of data collection, the function of requesting start / stop of the collection from the monitoring device is not added. The function can be realized.

[0040]

According to the present invention, it is possible to speed up transmission data processing.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a programmable controller showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of FIG.

FIG. 3 is an explanatory diagram showing a method of using a conventional data logging device.

FIG. 4 is an explanatory diagram showing a method of collecting data by a conventional monitoring device.

FIG. 5 is an explanatory diagram showing a conventional method of collecting data by individual controllers.

[Explanation of symbols]

 11 Common Memory Function 12 Scan Function 13 I / O Interface Function 15 Registration Table Function 16 Data Buffer Function 17 Data Collection Function

Claims (2)

[Claims] 1. A common memory function for storing and holding transmission station data transferred to and from another transmission station via a data transmission path, and the transmission station data stored and held by this common memory function is periodically stored. Function for collecting and automatically updating the control signals, I / O interface function for exchanging control signals or information signals with the process equipment to be controlled, and registration table for periodically collecting the control signals or information signals. Function, a data buffer function for storing and holding the control signal or information signal collected by this registration table function, and the control signal or information signal stored and held by this data buffer function and automatically updated by the scan function A program having a data collection function of time-sequentially collecting and storing transmission station data. Ramable controller device. 2. A batch transmission function for collectively transmitting the control signal or the information signal or the transmission station data to the other transmission station in response to a data transmission request from the other transmission station. The programmable controller device according to item 1.