JPH0642984A - Controller system for instrumentation and control - Google Patents

Abstract

PURPOSE:To minimize the times of transmission and reception of the transmission and reception text between an upper computer and a controller during parameter monitoring for speeding up the monitor by forming a table for responding reference number-parameter address. CONSTITUTION:To a controller system, a user table formation tool 4 is added. The tool 4 forms a table for responding to user definition reference number- parameter address having the same constitution and function as the table for responding to the reference number-parameter address in a controller That is, a reference number is set in the order of a parameter indicated on a monitor screen of the upper computer 1, the table for responding to user definition reference number-parameter address having the reference number responding to the parameter address is formed and this formed user definition reference number-parameter address is down-loaded through the communication line 3 to the controller 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrumentation control controller system which comprises a host computer and at least one controller to control various instrumentation devices, and particularly to a host computer for parameter monitoring. The present invention relates to a controller system for instrumentation control in which the number of times of sending and receiving texts to and from a controller is minimized to speed up monitoring.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a configuration example of a general instrumentation control controller system of this type.
In FIG. 4, a host computer 1 having a monitor screen and a plurality of (four in the figure) controllers 2 can communicate with each other via a communication line (for example, RS485) 3. Then, the host computer 1 reads the parameters (flow rate, set flow rate, operation output, temperature, parameter A, parameter B, etc.) shown in the monitor screen of FIG. Depending on the situation, the entire instrumentation control system is monitored by lighting it and displaying it on the monitor screen. Next, how the host computer 1 reads the data of the controller 2 will be described.

FIG. 6 is a diagram showing an example of a transmission / reception text transmitted / received between the host computer 1 and the controller 2. In FIG. 6, the transmission text of this example is parameter read, and the controller address, command,
It consists of a reference number, read number, and error tick.

The controller address specifies the controller 2 which must receive the transmission text and transmit the response text to the host computer 1.

The command also indicates what the host computer 1 requests the controller 2 to do. Examples of this command include parameter read, parameter write, bit set, and bit reset.

Further, the reference number is used as a substitute for the address in the case of parameter reading or the like. Normally, the arrangement of reference numbers is not the same as the arrangement of parameter addresses. The parameter read using this reference number is performed when a number of parameters are read from the specified reference number by giving consecutive reference numbers to a plurality of non-contiguous parameter addresses. In addition, the transmission / reception of the text transmitted / received between the host computer 1 and the controller 2 is only required once, and the monitor can be performed at high speed. In other words, if the parameter address is used without using this reference number, since the addresses are discontinuous, the sent and received texts are sent and received multiple times, or if the addresses are relatively close, specify the start address and specify how many bytes. If is specified, the number of times of sending and receiving the transmitted / received text may be one, but it is not efficient because unnecessary data is also read at the same time.

On the other hand, in the transmitted text of this example, the parameter is read, so the fourth item of the transmitted text is the number of leads. This read number specifies how many parameters are read from the specified reference number. The error check is for checking the soundness of the transmitted text, and for example, a checksum or the like is used. Further, the read data in the received text is the data transmitted by the controller 2 according to the reference number and the number of reads designated in the transmitted text.

Next, FIG. 7 is a block diagram showing an internal configuration example of the controller 2. In FIG. 7, when the controller 2 receives the transmission text as shown in FIG. 6 from the communication line (RS485) 3, the CPU 21 refers to the reference number-parameter address correspondence table 22, and the reference number in the transmission text is The address corresponding to the address is searched and the data of the corresponding address is read from the parameter table 23. In this case, if the number of reads is two or more, the search is performed to find out which address the reference number of the value obtained by adding 1 to the reference number of the transmission text corresponds, and the data of the corresponding address is retrieved from the parameter table 23. To lead. Then, when the data reading for the required number of reads is completed, the received text as shown in FIG. 6 is edited and a response is sent to the host computer 1 via the communication line (RS485) 3. With the method described above, the host computer 1 can read the parameters of the controller 2.

By the way, in the controller system for instrumentation control as described above, from the host computer 1,
In order to efficiently monitor the entire instrumentation control system, it is desirable to reduce the number of times of sending and receiving texts to and from the controller 2 and not read unnecessary parameter data. The parameters to be displayed on the monitor screen of the host computer 1 should be designed so that the user who constructs the controller system for instrumentation control can use the parameters most easily. The parameter address correspondence table 22 is provided as PROM by the manufacturer of the controller 2.

Therefore, even if the monitor screen created by the user is easy to use on the screen, the parameter reference numbers to be displayed are not always continuous when viewed from the reference number-parameter address correspondence table 22. Inevitably, the number of sent and received texts will inevitably increase,
This will hinder the speedup of parameter monitoring.

[0011]

As described above, in the conventional controller system for instrumentation control, the number of times of sending and receiving texts between the host computer and the controller is increased at the time of parameter monitoring, and the monitor speed is increased. There was a problem of hindering the conversion.

An object of the present invention is to speed up the monitor by minimizing the number of times of sending and receiving texts transmitted and received between the host computer and the controller at the time of parameter monitoring no matter what monitor screen the user constructs. It is to provide a controller system for instrumentation control capable of performing the above.

[0013]

In order to achieve the above object, according to the present invention, a controller address and a command are provided between a host computer having a monitor screen and at least one controller for controlling various instrumentation devices. , A transmission / reception text consisting of reference numbers can be sent and received via a communication line, and a host computer reads or writes predetermined parameters such as actual flow rate, set flow rate, operation output, etc. to the controller and displays them on the monitor screen. In the controller system for instrumentation control that monitors the entire instrumentation control system by (monitoring), the reference numbers are set in the order of the parameters displayed on the monitor screen, and the user definition has the reference number corresponding to the parameter address. Reference number-parameter address correspondence table on the user side User-defined reference number-parameter address correspondence table that is created and downloaded to the controller by the user-defined reference number-parameter address correspondence table and the user-defined reference number-parameter address correspondence table provided in the controller and downloaded from the user table creation means. When the transmission text is stored from the correspondence table storing means for storing the information and the host computer, the user-defined reference number-parameter address correspondence table stored in the correspondence table storing means is referred to determine the reference number in the transmission text. It is provided with means for searching whether it corresponds to the address, reading the data of the corresponding address from the parameter table, editing the received text, and transmitting it to the host computer via the communication line.

[0014]

Therefore, in the controller system for instrumentation control of the present invention, the reference numbers are set in the order of the parameters displayed on the monitor screen, and the reference number-parameter address correspondence table having the reference numbers corresponding to the parameter addresses is provided. The created table is downloaded to the control controller, and the downloaded reference number-parameter address correspondence table is stored in the correspondence table storage means. Then, when the transmission text is received from the host computer, the reference number-parameter address correspondence table is referred to, which address the reference number in the transmission text corresponds to is searched, and the data of the corresponding address is retrieved from the parameter table. The received text is read, edited, and sent to the host computer through the communication line. As a result, it is possible to minimize the number of times of sending and receiving texts transmitted and received between the host computer and the controller during parameter monitoring.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration example of an instrumentation control controller system according to the present invention. The same parts as those in FIG. 4 are designated by the same reference numerals and the description thereof will be omitted. Only mention.

That is, the controller system for instrumentation control of this embodiment is shown in FIG.
Is added. The user table creation tool 4 creates a user-defined reference number-parameter address correspondence table 24 having the same configuration and function as the reference number-parameter address correspondence table 22 in the controller 2. That is, the reference numbers are set in the order of the parameters displayed on the monitor screen of the host computer 1, the user-defined reference number-parameter address correspondence table 24 having the reference numbers corresponding to the parameter addresses is created, and the created user is created. The definition reference number-parameter address correspondence table 24 is downloaded to the controller 2 via the communication line (RS485) 3.

On the other hand, FIG. 2 is a block diagram showing an example of the internal configuration of the controller 2 in FIG. 1. The same parts as those in FIG. 7 are designated by the same reference numerals and the description thereof will be omitted. Here, only different parts will be described. Describe.

That is, the controller 2 of this embodiment is
A correspondence table 24 and a switch 25 are added to FIG. 7, and the CPU 21 has the following functions.

Here, the correspondence table 24 is for storing the user-defined reference number-parameter address correspondence table downloaded from the user table creation tool 4. The correspondence table 24 is
Since it is desirable to save the contents in the controller 2 even in case of power failure, RAM with backup or EEP
It is desirable to put it in ROM.

Further, the switch 25 is switched to either side of the reference number-parameter address correspondence table 22 or the correspondence table 24 by a manual operation of an operator, for example.

Further, when the CPU 21 receives the transmission text from the host computer 1, the reference number-parameter address correspondence table stored in the reference number-parameter address correspondence table 22 selected by the switch 25, or the correspondence table 24. The user-defined reference number-parameter address correspondence table stored in is searched to find out which address the reference number in the transmission text corresponds to, and the parameter table 23
It further has a function of reading the data of the corresponding address, editing the received text, and transmitting it to the host computer 1 via the communication line 3. Next, the operation of the instrumentation control controller system of the present embodiment configured as described above will be described using the flowchart shown in FIG. First, the user creates a monitor screen configuration of the host computer 1. Then, the parameters of each controller 2 to be displayed are determined.

Next, the user table creation tool 4 is used to determine reference numbers for the parameters to be displayed. In this case, consecutive reference numbers may be set in order to speed up the monitor. desirable. And
After setting the reference number, the reference number and the address in the controller 2 are paired to create a user-defined reference number-parameter address table.

Next, the user-defined reference number-parameter address table 24 created in this way is transferred to the correspondence table 2 of each controller 2 via the communication line 3.
Download to 4.

Next, in each controller 2, the switch 25 of FIG. 2 is switched to the position A shown in the figure so that the CPU 21 can select the user-defined reference number-parameter address correspondence table of the correspondence table 24. Next, in each controller 2, when the transmission text as shown in FIG. 6 is received, the reception text is created and responded as follows.

That is, when the controller 2 receives the transmission text shown in FIG. 6 from the communication line (RS485) 3, the CPU 21 determines that the switch 25 is in the position A, and therefore the user-defined reference number-parameter of the correspondence table 24. The address correspondence table is referred to, which address the reference number in the transmission text corresponds to is searched, and the data of the corresponding address is read from the parameter table 23. In this case, if the number of reads is two or more, the search is performed to find out which address the reference number of the value obtained by adding 1 to the reference number of the transmission text corresponds, and the data of the corresponding address is retrieved from the parameter table 23. To lead. Then, when data reading for the required number of reads is completed, edit the received text as shown in FIG.
It responds to the host computer 1 via the communication line 3. By the above method, the host computer 1
It is possible to read the parameters of the controller 2 and start monitoring from the host computer 1.

Here, what should be noted is the number of times of transmitting and receiving texts. That is, the user table creation tool 4 sets reference numbers in the order of parameters displayed on the monitor screen of the host computer 1,
Since the user-defined reference number-parameter address correspondence table is created, the reference numbers are continuous in parameter reading from the controller 2. Therefore, the transmission / reception of the transmitted / received text only needs to be performed once, thereby maximizing the speed of the parameter monitor.

As described above, the instrumentation control controller system of the present embodiment sets the reference numbers in the order of the parameters displayed on the monitor screen of the host computer 1, and sets the reference numbers corresponding to the parameter addresses to the user having the reference numbers. A user table creation tool 4 that creates a definition reference number-parameter address correspondence table on the user side and downloads the created user-defined reference number-parameter address correspondence table to the controller for control, and a user provided in the controller 2 When the correspondence table 24 that stores the user-defined reference number-parameter address correspondence table downloaded from the table creation tool 4 and the transmission text from the host computer 1 are received, the user-defined reference stored in the correspondence table 24 is displayed. The number-parameter address correspondence table is referred to, which address the reference number in the transmission text corresponds to is searched, the data of the corresponding address is read from the parameter table 23 to edit the reception text, and the communication line It is configured by adding the function of transmitting to the higher-level computer 1 via 3 to the conventional system.

Therefore, since the user table creation tool 4 is used to give the reference numbers to the order of the parameters to be displayed on the monitor screen of the host computer 1, the parameters between the host computer 1 and the controller 2 are monitored during parameter monitoring. The sending and receiving texts can be sent and received a minimum number of times, resulting in high-speed monitoring.

Further, since the reference numbers are given only to the parameters to be monitored by the host computer 1, it is possible to prevent access to unnecessary parameters due to an operation error or programming error. The present invention is not limited to the above embodiment, but can be implemented in the same manner as described below.

(A) In the above embodiment, the case where the user table creating tool 4 is provided and is connected to the communication line 3 has been described, but the present invention is not limited to this, and for example, as shown by the broken line in FIG. The configuration may be such that the creation tool 4 and the communication line (for example, RS232C) 5 are provided, and the user-defined reference number-parameter address table created by the user table creation tool 4 is downloaded to each controller 2 via the communication line 5.

(B) In the above embodiment, the case where the user-defined reference number-parameter address table is created by the user table creation tool 4 as a dedicated tool has been described. When a user creates a monitor screen using a graphic tool, it is possible to automatically assign a reference number without the user's awareness so that the table is created at the same time when the monitor screen is created.

(C) In the above embodiment, the reference numeral of FIG.
The case where the parameter address correspondence table 22 is configured only with the parameter address of the reference number has been described, but the present invention is not limited to this, and may include the upper and lower limit values of the parameter. Further, when supplied as a PROM, the upper and lower limit values of the parameters cannot be changed, but they are free to be defined by the user, and it is extremely useful as a measure to prevent operational errors when the parameters are changed from the host computer 1. It is valid. For example, when the upper and lower limit values are the same, only the upper and lower limit values cannot be changed from the host computer 1, which is useful for making the operator foolproof.

(D) In the above embodiment, one reference number is given to one parameter in the reference number-parameter address correspondence table 22 of FIG. 7, but when the user defines it, the monitor screen is displayed. If necessary, two or more reference numbers may be given to one parameter in the design.

(E) In the above embodiment, the parameters are normally handled as 4 Bytes floating point data inside the controller 2. However, in order to improve the transmission efficiency, the floating point data of 2 Bytes is sent to the host computer 1. Two's complement (-32,768 to 32,7
67) and transmitted. In the case of 2's complement, since there is no decimal point position data, the decimal point position is implicitly determined for each parameter. When supplied as PROM from the manufacturer, this decimal point position data is fixed,
It cannot be changed. However, from the user's point of view, depending on the parameter, the decimal point position data supplied from the manufacturer may be inconvenient. Therefore, by using the user table creation tool 4 which can also set the decimal point position data, it is possible to construct a system capable of better operation.

(F) In the above embodiment, the reference number-parameter address correspondence table 22 supplied by the maker is readable / writable for each parameter, and only read is determined. However, in order to prevent operation mistakes in advance, there are cases where it is desired to use read only for the parameters that can be read / written. In this case, by releasing the table creation function to the user, it is possible to freely read / write each parameter and determine only read.

(G) In the above embodiment, the user table creation tool 4 normally determines a reference number corresponding to a certain parameter in the entire system regardless of the address of the controller 2. The reference numbers corresponding to one parameter may differ. (H) In the above embodiment, the switch 25 may be either a soft means or a hard means such as a jumper pin.

[0038]

As described above, according to the present invention, no matter what monitor screen is constructed by the user, the number of times of sending and receiving texts between the host computer and the controller at the time of parameter monitoring can be minimized. As a result, it is possible to provide an instrumentation control controller system capable of increasing the monitor speed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a controller system for instrumentation control according to the present invention.

FIG. 2 is a block diagram showing an internal configuration example of a controller in the embodiment.

FIG. 3 is a flowchart for explaining the operation of the same embodiment.

FIG. 4 is a block diagram showing a configuration example of a conventional controller system for instrumentation control.

5 is a diagram showing an example of parameters displayed on the monitor screen in FIG.

6 is a diagram showing an example of a transmission / reception text transmitted / received between a host computer and a controller in FIG.

7 is a block diagram showing an internal configuration example of a controller in FIG.

[Explanation of symbols]

1 ... Host computer, 2 ... Controller, 3 ... Communication line (RS485), 4 ... User table creation tool, 21 ... CPU, 22 ... Reference number-parameter address correspondence table, 23 ... Parameter table, 24 ... Correspondence table, 25 ... switch.

Claims (1)

[Claims] 1. A transmission / reception text including a controller address, a command, and a reference number can be transmitted and received between a host computer having a monitor screen and at least one controller for controlling various instrumentation devices via a communication line. As a configuration, the host computer reads or writes predetermined parameters such as an actual flow rate, a set flow rate, and an operation output to the controller and displays (monitors) on the monitor screen to configure the entire instrumentation control system. In the controller system for instrumentation control to be monitored, reference numbers are set in the order of the parameters displayed on the monitor screen, and a user-defined reference number-parameter address correspondence table having reference numbers corresponding to parameter addresses is created on the user side. And the user created Reference number - parameter address and user table creation means for downloading to the correspondence table to the controller, provided in the controller, the user-defined reference numbers downloaded from the user table creation means -
When the transmission table storage means for storing the parameter address correspondence table and the transmission text from the host computer are received, the transmission text is referred by referring to the user-defined reference number-parameter address correspondence table stored in the correspondence table storage means. Means for searching which address the reference number in corresponds to, reading the data of the corresponding address from the parameter table, editing the received text, and transmitting it to the host computer via the communication line. A controller system for instrumentation control, which is characterized in that