JPH05260570A - Plant data input/output device - Google Patents

Abstract

PURPOSE:To improve transmission efficiency and to dispense with the change of software even when the order change of write data is requested by sending only a signal requested from an arithmetic unit side when process data sent from a plant is sent out to the arithmetic unit of a host computer. CONSTITUTION:A title and address conversion means 3 converts a received signal title 13 to information representing the data storage position of a signal value memory device 7 by using a title and pointer correspondence table 4, and returns an address value 14 to a signal readout means 1. The means 1 takes out a signal value 17 in accordance with the title 13 from the device 7 by using the address value 14, and transfers by assembling a data string to a signal processing means. Meanwhile, when communication data to register sample data as communication data 31 is sent from the outside, correspondence relation between the signal title and the address of the device 7 is stored newly in the table 4, and reception data 32 from a means 5 is decoded by a code analyzing means 6, and it is inputted to a signal registration means 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant data input / output device for sending process data (also referred to as plant data) sent from a plant to an arithmetic unit of a host computer using a communication means.

[0002]

2. Description of the Related Art The configuration of a conventional plant data input / output device is shown in FIG. Further, FIG. 5 shows a data communication procedure between the plant data input / output device and the arithmetic unit, and FIG. 6 shows a communication data format at this time.

As shown in FIG. 4, a conventional plant data input / output device includes a communication processing means 5 connected to a data transmission path and a code analysis means for analyzing a code of received data 32 input from the communication processing means 5. 6, signal value storage device 7,
It comprises a signal registration means 8, a signal reading means 9 and a pointer table 10.

When communication data representing a sample data request is sent from the outside as communication data 31, this communication data 31 is received by communication processing means 5 and received data 32 is output to code analysis means 6. The code analyzing means 6 sends the received data 34 to the signal reading means 9.
The signal reading means 9 sends the address value 36 to the pointer table 10.

On the other hand, as communication data 31 from the outside, as shown in FIG.
When communication data for registering sample data as shown in (a) is sent, the address of the signal value storage device 7 is newly stored in the pointer table 10. That is, in this case, the received data 32 output from the communication processing means 5 is deciphered by the code analysis means 6 from the content of the processing code as data for registering sample data, and is sent to the signal registration means 8. When the received data 33 is input from the code analysis means 6 in the signal registration means 8, the address of the signal value storage device 7 is written in the pointer table 10.

In the conventional plant data input / output device described above, after receiving a plurality of process data sent from the plant at the receiving end, the signal is converted and stored in the signal value storage device 7. Then, when the data is transferred from the plant data input / output device to a higher-level computer (hereinafter, referred to as an arithmetic device) that performs arithmetic processing, the contents of the signal value storage device 7 are collectively transmitted.

On the other hand, on the arithmetic unit side, the contents of the signal written in the signal value storage unit 7 on the plant data input / output unit side are grasped in advance and transmitted from the input / output unit shown in FIG. 6 (b).
The sample data shown in is decomposed and used for arithmetic processing.

[0008]

In the above-described conventional plant data input / output device, the combination of data sent from the input / output device to the arithmetic device is fixed. Therefore, even if the arithmetic unit wants to refer to a part of the data in the signal value storage device 7, since all the data in the signal value storage device 7 is sent, the efficiency is poor and the physical quantity to be known does not depend on which module. The arithmetic unit side must always be aware of which channel is input. Therefore, it is a burden on the software developer on the arithmetic unit side, and if the order of the data to be written in the signal value storage device on the input / output unit side is changed, the software on the arithmetic unit side must also be changed. There's a problem.

The present invention has been made in order to solve such a conventional problem, and improves the transmission efficiency by sending out only the signal requested by the arithmetic unit side, and also to the signal value storage device. It is an object of the present invention to provide a plant data input / output device that does not require the software on the arithmetic unit side to be changed even when the order of write data is changed.

[0010]

In order to solve the above problems, the present invention provides a signal processing for sending process data sent from a data transmission line, a communication processing unit connected to the data transmission line, and a plant to the data transmission line. In the plant data input / output device including a unit, the signal processing unit includes a storage device for storing a signal value of the process data, and a signal registration means for registering a signal name of the process data and an address of the storage device. A name / pointer correspondence table that stores the signal name registered by the signal registration means and the address of the storage device in association with each other, and the signal name by using the name / pointer correspondence table Name / address conversion means to convert to a value,
It is characterized by further comprising signal reading means for reading a signal value corresponding to the signal name from the storage device and outputting the signal value using the address value output from the name / address converting means.

[0011]

In the present invention, the signal registration means first associates the signal name, which is a character string representing the physical meaning of the signal value of the process data from the plant, with the address of the storage device in which the signal value is stored. Create the name / pointer correspondence table. It is possible to add / change / delete data in this name / pointer correspondence table.

The signal reading means receives the signal name from the communication processing means via the code analysis means, and outputs the signal value of the process data of the data having the signal name to the communication processing means.

The name / address conversion means refers to the name / pointer correspondence table and converts the input signal name into an address value of the signal storage device. Then, using this address value, the signal value is taken out from the signal value storage device and output to the signal reading means.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a plant data input device according to an embodiment of the present invention. 2 is a flowchart showing a series of processing procedures of the apparatus of FIG. 1, and FIG. 3 is a diagram showing a communication data format.

The plant data input / output device shown in FIG.
The signal reading unit 1, the signal registering unit 2, the name / address converting unit 3, the name / pointer correspondence table 4, the communication processing unit 5 and the code analyzing unit 6 connected to the data transmission path. Here, the signal processing unit for sending out the process data from the plant stored in the signal value storage device 7 to the data transmission line is the signal reading unit 1, the signal registration unit 2,
It is composed of a name / address conversion means 3 and a name / pointer correspondence table 4. The signal storage device 7 stores and stores the signal name and the signal value of the process data.

Next, the operation of the plant data input / output device of this embodiment will be described with reference to FIGS. 2 and 3. When communication data representing a data request as shown in FIG. 3B is sent from the outside as the communication data 31, this communication data 31 is received by the communication processing means 5, and the received data 32 is the code analysis means. 6 is output. The code analysis means 6 decodes the content of the processing code following the start code of the received data 32, judges that it is a data request,
The received data 11 is sent to the signal reading means 1. The signal reading means 1 passes the signal name 13 to the name / address converting means 3.

The name / address conversion means 3 uses the name / pointer correspondence table 4 to receive the received signal name 13
Is converted into information (hereinafter referred to as an address) indicating the data storage position of the signal value storage device 7, and the address value 14 is returned to the signal reading means 1. The signal reading means 1 uses the address value 14 to retrieve the signal value 17 corresponding to the signal name 13 from the signal value storage device 7, and then, FIG.
The communication processing means 5 is assembled into a data string 18 as shown in FIG.
Transfer to. The communication processing means 5 outputs this data string 18 as outgoing data 38 to the outside.

On the other hand, as communication data 31 from the outside, as shown in FIG.
When communication data for sample data registration as shown in (a) is sent, the name / pointer correspondence table 4
With respect to, the correspondence between the signal name and the address of the signal value storage device 7 is newly stored. That is, in this case, the received data 32 output from the communication processing means 5 is deciphered by the code analysis means 6 from the content of the processing code as data for registering sample data, and is sent to the signal registration means 2. In the signal registration means 2, the code analysis means 6
When the received data is input from, the name / pointer correspondence table 4 is searched from the signal name in the received data, and the signal name in the received data and the address of the signal value storage device 7 are written.

[0019]

As described above, according to the present invention, since only the requested data is sent out, the transmission efficiency is improved as compared with the conventional system in which the contents of the data storage device are sent as they are.

Further, since the data output request is specified only by the character string of the signal name, there is an advantage that external software is not affected even if the address of the storage device assigned to each data is changed.

[Brief description of drawings]

FIG. 1 is a block diagram of a plant data input / output device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of processing in the embodiment.

FIG. 3 is a diagram showing a communication data format in the embodiment.

FIG. 4 is a block diagram of a conventional plant data input / output device.

FIG. 5 is a flowchart showing a processing flow of the plant data input / output device of FIG.

FIG. 6 is a diagram showing a conventional communication data format.

[Explanation of symbols]

1 ... Signal reading means 2 ... Signal registration means 3 ... Name / address conversion means 4 ... Name / pointer correspondence table 5 ... Communication processing means 6 ... Code analysis means 7 ... Signal value storage device

Claims (1)

[Claims] 1. A plant data input / output device comprising a data transmission line, a communication processing unit connected to the data transmission line, and a signal processing unit for transmitting process data sent from the plant to the data transmission line. Is a signal registration means for registering a signal name of the process data and an address of a storage device for storing a signal value of the process data, and the signal name and the address of the storage device registered by the signal registration means. A name / pointer correspondence table stored in association with each other, a name / address conversion means for converting the signal name into an address value of the storage device using the name / pointer correspondence table, and output from the name / address conversion means. Signal reading for reading out the signal value corresponding to the signal name from the storage device using the address value Plant data output apparatus characterized by comprising a by means.