JPH07114412A - Communication abnormality analyzer for sequencer network - Google Patents

Abstract

PURPOSE:To relieve the load on a operator and to improve the operation rate by comparing an impedance of a communication line in the normal state measured by an analyzer and an impedance of a communication line when it is abnormal and displaying the comparison result. CONSTITUTION:The analyzer 30 is connected to a computer 1 in parallel with a main communication adaptor 2 and a switch 40 is used to connect a communication line 20 to a communication adaptor 2 or the analyzer 30. The analyzer 30 comprising a line impedance measurement device 31 and a switch 32 is connected to an analog input port 11. The analog port 11 has two input lines, the one is an input line for reference data and the other line is an input line for measurement data, which are compared with the reference data. The line impedance measurement device 31 is used to measure the line impedance of the communication line 20 and stores the line impedance in the normal state to the computer 1. When the communication line is abnormal, the liner impedance of the state is measured and compared with the normal value and the result is displayed on a display device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention sends communication data from a computer to a communication line via a main communication adapter and receives communication data on the communication line via a sub communication adapter connected to each sequencer. The present invention relates to a sequencer network, and more particularly to a sequencer network communication abnormality analysis device that displays data capable of specifying the type and location of an abnormality on a display of a computer when a communication abnormality occurs in the sequencer network.

[0002]

2. Description of the Related Art A conventional sequencer network is shown in FIG.
It has a circuit configuration as shown in. That is, 1 is a computer for controlling the drive of the injection extruder by transmitting the production instruction data to a sequencer for directly driving and controlling the injection extruder of each production line. In this embodiment, a personal computer is used as the computer 1, and it is sufficient that the computer 1 has a function of a so-called personal computer that is commercially available.

Reference numeral 2 denotes a main communication adapter, which has a function of receiving the production instruction data transmitted from the computer 1 and distributing the received production instruction data to a sequencer for directly driving and controlling the injection extruder of each production line. ing. The main communication adapter 2 is connected to the computer 1 via a communication line 20.

Sub communication adapters 3, 4, 5, and 6 are provided on each production line (four in this embodiment). This communication adapter 3, 4, 5, 6
Each is connected to the series by a communication line 20.

Sequencers 7, 8, 9, and 10 are connected to the sub communication adapters 3, 4, 5, and 6, respectively.
That is, the sequencer 7 is connected to the sub communication adapter 3, the sequencer 8 is connected to the sub communication adapter 4, the sequencer 9 is connected to the sub communication adapter, and the sequencer 10 is connected to the sub communication adapter 6.

The sequencers 7, 8, 9 and 10 directly drive and control, for example, an injection extruder of each production line based on the production instruction data sent from the computer 1.

When a communication abnormality occurs in such a sequencer network, it becomes difficult for an operator to determine the type of abnormality, the place where the abnormality has occurred, and the like.

[0008]

Therefore, in the conventional sequencer network, when the communication abnormality occurs, the computer 1 cannot receive the data output from the sequencers 7, 8, 9, and 10. Therefore, since the worker sees the data output to the CRT of the computer 1 or the printer and notices the abnormality for the first time, the worker accurately and early finds the type of the abnormality and the location of the abnormality. It has a problem that it is not possible.

Further, in the conventional sequencer network, when a communication abnormality occurs, it is difficult for the operator to determine whether it is an abnormality in the communication protocol or an electrical abnormality. is doing.

Further, in the conventional sequencer network, when a communication abnormality occurs, it is difficult to know where in the sequencer network the abnormality is in the case of an electrical abnormality, and the abnormality is detected in data management. However, there is a problem that the process data cannot be highly reliable.

An object of the present invention is to quickly detect what is the cause of the communication abnormality and where the communication abnormality is caused when the communication abnormality occurs in the sequencer network, and reduce the burden on the operator. It is to improve the reliability of transmission data by improving the operation rate of the entire process.

[0012]

In order to achieve the above object, in a communication error analysis device for a sequencer network according to the present invention, communication data is sent from a computer to a communication line via a main communication adapter, and the communication line is transmitted. In a sequencer network that receives communication data on a line via a sub communication adapter connected to each sequencer, the impedance value of the communication line when normal and the impedance value of the communication line when abnormal An analysis device for outputting to the computer is connected to the output terminal of the computer in parallel with the main communication adapter, and the impedance value of the communication line in the normal state and the impedance of the communication line in the abnormal state of the communication line measured by the analysis device The comparison value with the value is displayed on the computer display. It is obtained by way.

[0013]

[Function] The computer and the analysis device are connected, and the line impedance of the communication line connecting the main communication adapter and the sub communication adapter, which connects the computer and the sequencer, is measured using the analysis device, and the measured line impedance is measured. Is stored in the computer. After that, the connection between the computer and the analysis apparatus is released from the connection state between the computer and the analysis apparatus, and the connection state between the computer and the main communication adapter is established to connect to the normal data communication line.

In such a communication line state, the communication data is sent from the computer to the communication line via the main communication adapter. The communication data transmitted on this communication line is received by a specific sub communication adapter connected to a specific sequencer according to the address. In this particular sub communication adapter, a response signal indicating that the transmitted communication data has been correctly received is returned according to the data request command transmitted from the computer.

After the computer transmits the data request command to the sub communication adapter, if the response signal is not returned within a predetermined time, it is judged that the communication line is abnormal. As a response signal, "! When the mark (error code) is returned, the details of the abnormality are displayed on the computer display based on the error code. If it is determined that the communication line is abnormal, change the connection state between the computer and the main communication adapter to the connection state between the computer and the analysis device, measure the line impedance in the abnormal line state, and use this measured value and the line under normal conditions. The impedance measurement is compared and displayed on the computer display. From the comparison value of the line impedances displayed on this display, the operator determines where in the sequencer network the line abnormality is caused.

[0016]

EXAMPLES Examples of the present invention will be described below. FIG. 1 shows an embodiment of a communication abnormality analysis device for a sequencer network according to the present invention. In the figure, components having the same reference numerals as those used in the circuit of the sequencer network shown in FIG. 4 indicate the same members, and their functions are the same as those shown in FIG.

This embodiment is different from the conventional example shown in FIG. 4 in that a computer 1 is connected with an analyzer 30 in parallel with a main communication adapter 2 and a switch 40 is used to connect the communication line 2 to the computer 1.
0 is connected to the main communication adapter 2 or the analysis device 30 by switching. That is, in the figure, reference numeral 11 is an analysis device, which is connected to the computer 1 in parallel with the main communication adapter 2 and is switched by the switch 40 so that the computer 1-the analysis device 30-the communication line 20.
And a circuit of computer 1-main communication adapter 2-communication line 20 can be configured.

The main communication adapter 2 and the analysis device 30 are
It has a structure as shown in FIG. That is, the main communication adapter 2 includes a communication port 21 that receives communication data output from the computer 1 and a line driver 22 that puts the communication data received by the communication port 21 on the communication line 20. The line driver 22 is connected to the communication line 20 via the switch 40. The analysis device 30 is composed of a line impedance measurement device 31 and a switch 32,
It is connected to the analog input port 11 of the computer 1. The analog input port 11 has two input lines, one of which is a reference data input line for storing reference data via the analog input port 11. The other is a circuit for comparing the measured data with the reference data via the analog input port 11 on the input line of the measured data. A switch 32 switches the connection state of the computer 1 to the analog input port 11. The line impedance measuring device 31 is connected to the switch 32.

The line impedance measuring device 31 measures the line impedance of the communication line 20 connected via the switch 40. When measuring the line impedance of the communication line 20, the switch 40 is connected to the c contact side, and the communication line 20 and the computer 1 are connected via the analysis device 30. In this state, the switch 32 is connected to the contact a side, and the line impedance measuring device 31 measures the line impedance of the communication line 20 when the communication line 20 is normally initialized. The measured value of the measured line impedance of the communication line 20 is taken into the main body of the computer 1 via the analog input port 11 of the computer 1 via the a contact of the switch 32 and stored therein.

After that, the switch 40 is connected to the d-contact side, the communication line 20 and the computer 1 are connected, and the sequencer is connected from the computer 1 via the main communication adapter 2 to the sub communication adapters 3, 4, 5 and 6. 7, 8, 9,
Communication data is transmitted to 10. The following two cases can be considered as a state in which an abnormality has occurred in the sequencer network for transmitting communication data to the sequencers 7, 8, 9 and 10. One is by communication protocol and the other is by electrical. The abnormality due to the communication protocol is that a data request command is transmitted from the computer 1 side to any of the sequencers 7, 8, 9, 10 and a predetermined time (for example, 5
Within seconds) from the sequencer, "! ] When the response of mark is returned. this"! , ”The computer 1 detects the error code and displays the abnormality content on the CRT based on the error code table stored in advance. An abnormality caused by an electric thing is transmitted from the computer 1 side to any one of the sequencers 7, 8, 9, and 10 and then transmitted from the sequencer within a predetermined time (for example, 5 seconds). "! ] When the response of the mark is not returned. this"! If the mark “” is not returned, it means that there is an abnormality in the communication path, and the abnormality is determined by an electrical one.

The electrical abnormality is determined by measuring the line impedance of the communication line 20 when the communication path is abnormal and comparing it with the normal line impedance of the communication line 20. That is, in measuring the line impedance of the communication line 20 when the communication path is abnormal, the switch 40 is connected to the c contact side, and the communication line 20 and the computer 1 are connected via the analysis device 30.
In this state, connect the switch 32 to the b contact side,
The line impedance measuring device 31 measures the line impedance of the communication line 20 when the communication path is abnormal. The measured value of the measured line impedance of the communication line 20 when the communication path is abnormal is taken into the computer 1 main body via the analog input port 11 of the computer 1 via the b contact of the switch 32, and the result is displayed on the CRT. With the display on the CRT, the measured value of the line impedance of the communication line 20 when the communication path is abnormal is compared with the measured value of the line impedance of the communication line 20 at the normal time, and Determine if there is something abnormal.

In FIG. 3, the sequencers 7, 8, 9, 1 are shown.
0 is a flowchart for monitoring an abnormal state of the sequencer network for transmitting communication data. The flow chart shown in FIG. 3 can be implemented by a method of interrupting the main control flow chart (not shown) for driving the computer 1 at regular intervals.

In the figure, in step 100, a data request command is transmitted from the computer 1 side to any of the sequencers 7, 8, 9, 10. Then, in step 110, in response to the data request command being transmitted, a response signal is returned from the sequencer 7, 8, 9, 10 side to the computer 1 within a predetermined time (for example, 5 seconds) after transmitting the data request command. It is determined whether it has come. If it is determined in step 110 that there is no response signal to the transmission of the data request command, it is determined in step 120 that there is an abnormality in the communication path, and the communication analyzer 30 is used to determine an abnormal state in the communication path. . That is, switch 40 to c
Connect it to the contact side and switch b of the communication analysis device 30 to b.
By connecting to the contact side, the line impedance of the communication line 20 when the communication path is abnormal is measured. Then, the measured value of the line impedance of the communication line 20 when the measured communication path is abnormal is sent to the computer 1 main body through the analog input port 11 of the computer 1. Then, in step 140, the result is displayed on the CRT by the computer 1, and the measured value of the line impedance of the communication line 20 when the communication path is abnormal is compared with the measured value of the line impedance of the normal communication line 20, Determine where on the sequencer network the abnormality is occurring. If it is determined in step 110 that there is a response signal to the data request command,
In step 130, the transmitted response signal is "! ] It is determined whether or not it is a mark (error code). In step 130, the response signal transmitted is "! If it is determined that the mark is not the mark, the process returns to step 110 and the same flow process is performed. In step 130, the response signal transmitted is "! When it is determined that the mark is a mark, in step 140, the error content is transmitted from the transmitted error data code (response signal) based on the error code table stored in advance, and the abnormality content is searched for and displayed on the CRT.

As described above, since the analyzer 30 is provided to measure the line impedance with respect to the abnormality of the communication path and compare it with the line impedance value of the communication line 20 at the normal time to detect the abnormality, the abnormality is detected. It is possible to accurately and early detect the type (whether the communication path is abnormal or whether it is due to a communication protocol) and the location of the abnormality (where in the communication path the abnormality is occurring), and improve the reliability of the data. It is possible to propose the burden on the worker by early detection of the communication path abnormality, and further improve the operation rate of the whole positive.

[0025]

According to the present invention, an analyzer for switching between the impedance value of a communication line in a normal state and the impedance value of a communication line in the case of an abnormal communication line to measure and output it to a computer is connected to a main communication adapter of an output terminal of the computer. It is connected in parallel with the communication device, and the impedance value of the communication line during normal operation measured by the analyzer is compared with the impedance value of the communication line during abnormal communication line, and it is displayed on the computer display. It is possible to detect the cause of the communication error and where the communication abnormality is early, reduce the burden on the operator, improve the operation rate of the entire process, and improve the reliability of the transmission data.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a communication abnormality analysis device for a sequencer network according to the present invention.

FIG. 2 is a detailed circuit diagram of the analysis device shown in FIG.

FIG. 3 is a communication abnormality analysis flowchart by a computer connected to the sequencer network shown in FIG. 1 and an analysis device.

FIG. 4 is a circuit diagram showing a connection state between a computer of a conventional sequencer network and each sequencer.

[Explanation of symbols]

1 ……………………………………………………………… Computer 2 ……………………………………………………………… Main Communication adapters 3, 4, 5, 6 ………………………………………… Sub communication adapters 7, 8, 9, 10 ………………………………………… …… Sequencer 20 ………………………………………………………… Communication line 30 ………………………………………………………… … Analyzer

Claims (1)

[Claims] 1. A sequencer network in which communication data is sent from a computer to a communication line via a main communication adapter and communication data on the communication line is received via a sub communication adapter connected to each sequencer is normally used. When the impedance value of the communication line at the time and the impedance value of the communication line at the time of communication line abnormality is switched and measured and output to the computer, an analyzer is connected in parallel with the main communication adapter to the output terminal of the computer, Communication of a sequencer network, wherein a comparison value between the impedance value of the communication line in the normal state and the impedance value of the communication line in the abnormal state of the communication line measured by the analyzer is displayed on the display of the computer. Anomaly analyzer.