JP2698703B2 - Multi-port adapter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention is used when a complex computer system used for plant control or online control is managed by one maintenance CRT. Related to a multi-port adapter device.

(Prior Art) For example, a computer system for controlling a power plant, even when an abnormality occurs in one host computer, continues the plant control by another host computer having the same function and stops the power generation function. To prevent this, a complex computer system using a plurality of host computers is configured.

Here, usually, the host computer has
A CRT for maintenance is provided, which takes in a signal to notify the operating state and displays the progress of the control and the occurrence of an abnormality, and also provides an instruction to change the control procedure through a key input unit. In this case, the number of maintenance CRTs corresponding to the number of installed host computers is included in the system.

(Problems to be Solved by the Invention) However, the maintenance CRT of the host computer as described above usually only displays the operation state, and is used only at the time of maintenance such as periodic inspection from the viewpoint of the user. Therefore, it is considered useless to purchase a maintenance CRT as many as a plurality of host computers individually when configuring a complex computer system.

The present invention has been made in view of the above problems. For example, when configuring a complex computer system, there is no need to provide a maintenance CRT to each of a plurality of host computers, and
It is an object of the present invention to provide a multi-port adapter device that enables one host computer to share a maintenance CRT.

[Configuration of the Invention] (Means for Solving the Problems) That is, a multiport adapter device according to the present invention includes a plurality of host connection ports to which a plurality of host computers are individually connected, and a plurality of host connection ports. A host receiving buffer connected to each of the connection ports, a CRT connection port to which a maintenance CRT is connected, a host selection switch for designating one of the plurality of host connection ports, and a host using this host selection switch Data writing means for sequentially writing data input to the host connection port to the host reception buffer corresponding to the port when the connection port is not specified; and data to be written to the host reception buffer by the data writing means. Code detecting means for detecting a line feed code of A one-line data output means for reading out the data written in the buffer when a line feed code is detected in the write data and outputting the data from the CRT connection port; It is provided with data transfer means between designated ports for performing data input / output only between a designated host connection port and the CRT connection port.

(Operation) In other words, even if data signals from a plurality of host computers are input asynchronously, they can be transferred to the maintenance CRT in a state determined as one line of host data without being confused with each other. By specifying the host connection port with the switch, direct input / output of data between the maintenance CRT and a specific host computer is possible, so one maintenance CRT is shared by multiple host computers It becomes possible.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration of the multiport adapter device 10, and the multiport adapter device 10 is provided with a control unit 11. The control unit 11 controls input / output of data signals transferred through the multi-port adapter device 10.The control unit 11 has a maintenance CRT connection port 12 via a control and data bus 11a, and A plurality of host connection ports 13a, 13b,... Are connected.

A maintenance CRT 14 is connected to the maintenance CRT connection port 12, and a plurality of host computers 15a, 15b,... In the complex computer system are individually connected to the plurality of host connection ports 13a, 13b,. Connected to.

In addition, the plurality of host connection ports 13a, 13b,.
The host reception buffers 16a, 16b,... Are respectively connected.
.. Temporarily store data from the host computers 15a, 15b,... Inputted through the corresponding host connection ports 13a, 13b,. , 16b,... Are controlled by the control unit 11.

Further, a host selection switch 17 is connected to the control unit 11. This host selection switch 17
Designates a host connection port corresponding to a specific host computer when the input data from the maintenance CRT 14 is transferred as a downstream signal to any of the host computers 15a, 15b,... 17
When none of the host connection ports 13a, 13b,... Is designated, the input data from each host computer 15a, 15b,.

Here, a state in which no host connection port is designated by the host selection switch 17 is called an auto mode, and a state in which any host connection port is designated is called a select mode.

Next, an operation when the multiport adapter device 10 having the above configuration is applied to a plant control system will be described.

First, in a normal plant control state, a data signal indicating an operation state from each of the host computers 15a, 15b,.
CRT 14 for maintenance through this multiport adapter device 10
Is forwarded to

That is, the host selection switch 17 is set to the auto mode in which none of the host connection ports 13a, 13b,... Is designated.

That is, when data from one host computer 15a is input to the host connection port 13a, the host data is sequentially written to the host reception buffer 16a under the control of the control unit 11. When data from the other host computer 15b is input to the host connection port 13b, the host data is sequentially transferred to the host reception buffer 16b under the control of the control unit 11 in the same manner as in the case of the one host data. Written.

Here, for example, when a line feed code (LF: line Feed) is detected by the control unit 11 as host data to be written into one of the host reception buffers 16a, the data written into the host reception buffer 16a becomes one line. Is determined and read as host data partitioned into
The data is transferred to the maintenance CRT 14 through the T connection port 12 and displayed. In this case, with respect to the read data from the host reception buffer 16a, at the time of the transfer output, host identification data (for example, "01") indicating that the data is the host data from one host computer 15a is added to the head of the data. Is done.

For example, when the control unit 11 detects a line feed code (LF: Line Feed) as host data to be written into the other host reception buffer 16b, the host reception buffer 16b receives the line reception code in the same manner as in the case of the one host data. The data written in the buffer 16b is determined as the host data divided into one line, read out, transferred to the maintenance CRT 14 through the maintenance CRT connection port 12, and displayed. Also in this case, with respect to the read data from the host reception buffer 16b, at the time of the transfer output, the host identification data (for example, "02") indicating that the data is the host data from the other host computer 15b is sent to the data head. Is given to

That is, even if data signals from a plurality of host computers 15a, 15b,... Are input asynchronously, they can be transferred in a state determined as one row of host data. The host data is not confused, and even one maintenance CRT 14 can display data from a plurality of host computers 15a, 15b,... As individual data.

Moreover, since the transfer data is provided with the host identification data, the user can use any of the host computers 15a and 15a.
The data from b,... can be easily recognized.

On the other hand, when performing periodic inspections and the like of this plant control system, if it is desired to transfer the input data from the maintenance CRT 14 to, for example, only one of the host computers 15a, the host selection switch 17 controls one of the host connection ports. 13a is designated, and the mode is set to the select mode.

In this case, first, all the host data from the host computer 15a stored in the host reception buffer 16a is read and transferred to the maintenance CRT 14 via the maintenance CRT connection port 12. Then, after that, the host selection switch 17 causes the one host connection port 13
When a is specified, the host data input from the host connection port 13a is not written to the host reception buffer 16a, but is transferred and output to the maintenance CRT 14 via the maintenance CRT connection port 12 as it is. .

The data input from the maintenance CRT 14 via the maintenance CRT connection port 12 is transferred and output to one host computer 15a via the host connection port 13a specified by the host selection switch 17.

On the other hand, when the host connection port 13a is specified,
Host connection port 13b from the other host computer 15b
All of the host data input through is written to the host reception buffer 16b, and is transferred to the maintenance CRT 14 after the return to the auto mode.

Thereafter, when the designation of the host connection port 13a is released by the host selection switch 17, the control unit 11
Returns to the control processing of the auto mode.

Therefore, the multi-port adapter device 10 having the above configuration
, The host data input asynchronously from the plurality of host computers 15a, 15b,... To the host connection ports 13a, 13b,... Are temporarily written into the corresponding host reception buffers 16a, 16b,. , When a line feed code is detected in the write data, the host reception buffers 16a, 16b,.
Is read and transferred from the maintenance CRT connection port 12 to the maintenance CRT 14, so that the host data from the plurality of host computers 15a, 15b,. Can be given to the maintenance CRT 14, and the status data and the like of each host computer 15a, 15b,... Can be individually displayed on one screen.

The host connection port is set by the host selection switch 17.
By setting any one of 13a, 13b,... To the select mode, data can be directly input and output between the maintenance CRT 14 and a specific host computer. , 15b,... Can be carried out independently.

As a result, one maintenance CRT 14 can be shared by a plurality of host computers 15a, 15b,.

[Effects of the Invention] As described above, according to the present invention, a plurality of host connection ports to which a plurality of host computers are individually connected, and a host reception buffer respectively connected to the plurality of host connection ports A CRT connection port to which the maintenance CRT is connected, and one of the plurality of host connection ports
A host selection switch for specifying a port, and data writing means for sequentially writing data input to the host connection port to the host reception buffer corresponding to the port when the host connection port is not specified by the host selection switch Code detecting means for detecting a line feed code of data written to the host receiving buffer by the data writing means; and a code written to the buffer when the code detecting means detects a line feed code in the buffer write data. In one row data output means for reading data and outputting from the CRT connection port, and in a state where one host connection port is designated by the host selection switch,
Since it is configured to include data transfer means between designated ports for performing data input / output only between the designated host connection port and the CRT connection port, for example, when configuring a complex computer system, a plurality of It is possible to provide a multiport adapter device that can share one maintenance CRT with each host computer without having to provide a maintenance CRT in each of the host computers.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a multiport adapter device according to one embodiment of the present invention. 10 Multiport adapter device, 11 Control unit, 11a Control and data bus, 12 CRT connection port for maintenance, 13a, 13b, Host connection port, 14 CRT for maintenance, 1
5a, 15b, ... host computer, 16a, 16b, ... host reception buffer, 17 ... host selection switch.

Claims (1)

(57) [Claims] 1. A plurality of host connection ports to which a plurality of host computers are individually connected, a host reception buffer connected to each of the plurality of host connection ports, and a CRT connection to which a maintenance CRT is connected. A port, a host selection switch for designating any one of the plurality of host connection ports, and data input to the host connection port corresponding to the port when the host connection port is not designated by the host selection switch. Data writing means for sequentially writing to the host reception buffer, code detection means for detecting a line feed code of data written to the host reception buffer by the data writing means, and line feed to buffer write data by the code detection means. Reads the data written to the buffer when the code is detected. One-line data output means for outputting from the CRT connection port, and designation of data input / output only between the designated host connection port and the CRT connection port in a state where one host connection port is designated by the host selection switch A multiport adapter device, comprising: data transfer means between ports.