JPH07244625A - Handy terminal - Google Patents

Abstract

PURPOSE:To enable invariably stable operation by providing a console part having a means which is freely connected to a transmission part and inputs data sent from a transmission control means to a data transmission line and a means which displays sent and received data. CONSTITUTION:In the handy terminal 3, a transmission part 4 is installed fixedly as to a common serial transmission line 1 and a console part 6 can be detached from the handy terminal 3 by disconnecting a connection cable 5. Namely, the transmission part 4 which has a transmission and reception control means and a data processing means is installed fixedly to the data transmission line, the console part 6 having the data input means for inputting data and the display means for displaying the sent and received data is connected to the transmission part 4 so that it can be disconnected, and the handy terminal 3 is connected directly to the data transmission line, so that respective control equipments and the same data can be shared on the data transmission line. Further, the console part 6 is disconnected from the transmission part 4 and the transmission part 4 can be left on the data transmission line as it is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the setting / setting of a data transmission system in which a plurality of control devices are connected to a common data transmission line.
It concerns a handy terminal that monitors.

[0002]

2. Description of the Related Art Conventionally, there is a data transmission system capable of exchanging information between a plurality of control devices via a common data transmission path. In such a data transmission system, maintenance personnel monitor / maintain the system, but conventionally, the tool is directly connected to a central control panel or a control device in a central electric room.

However, according to the method of monitoring using the central control panel as described above, although a complicated display can be made on the central control panel, it is not possible to directly see the on-site situation, and the tool is directly connected to the control device. In the method, although the speed is higher than that of the control device to which the tool is connected, there is a problem in that the control regarding other control devices is transmitted via software, so that the response is delayed.

Therefore, conventionally, there has been a demand for a man-machine interface device that can be easily carried by maintenance personnel to the work site and responds to human input at a sufficiently high speed. Therefore, conventionally, as a device that satisfies high-speed responsiveness, a handy terminal (manual) for setting / monitoring a system on a common transmission line of a control data transmission system in which a plurality of control devices are connected to the common transmission line is used. A machine interface device) is considered to be directly connected.

[0005]

However, even the above-mentioned structure has the following problems. (1) Since the handy terminal is directly connected to the common transmission line of the system, the data transmission for control may be affected when the handy terminal is attached or detached. In particular, in the case of industrial transmission systems, in order to ensure deterministic response, the method of passing the transmission right such as token passing is used for media access control, so the handy terminal is separated from the transmission system. Every time you do or enter, you have to rebuild the system each time,
During this time, communication will be disabled.

(2) Since the handy terminal directly connected to the transmission line can communicate with all devices connected to the transmission line, if the maintenance staff gives an incorrect instruction, the entire system will be thought of. It may have no effect.

(3) The handy terminal is usually removed from the system except when it is used by maintenance personnel. Therefore, for example, when the handy terminal is not connected, the transmission line is abnormal. Even if it is, if it is an end part on the transmission line that is not related to control, it may not be possible to detect the anomaly in advance, and then after connecting the handy terminal, the anomaly may be detected. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a handy terminal that can always expect stable operation.

[0008]

According to the present invention, a handy device which is directly connected to the data transmission line of a data transmission system capable of exchanging information between a plurality of control devices via a common data transmission line. A terminal, which is fixedly installed on the data transmission path, controls transmission and reception of data relating to the control device with respect to the data transmission path, and data processing means which processes data transmitted and received by the transmission and reception control means. And a data input unit that is detachably connected to the transmission unit and that receives data to be transmitted from the transmission / reception control unit to the data transmission line, and transmission / reception data that is processed by the data processing unit. And a console section having a display unit for displaying.

Further, according to the present invention, the transmission section has station number designating means for designating its own station number, and when the console section receives the station number from the transmission section, it corresponds to the station number. The input means and the display means are allowed only to input and display the data to be displayed. Further, according to the present invention, the data processing means of the transmission unit is configured to have a function of adding information depending on whether or not the console unit is connected to the transmission data.

[0010]

As a result, according to the handy terminal of the present invention, the transmission / reception control means and the data are provided in the data transmission line of the data transmission system which enables information exchange between a plurality of control devices via the common data transmission line. A transmission unit having a processing unit is fixedly installed, while a console unit having a data input unit for inputting data and a display unit for displaying transmitted / received data is detachably connected to the transmission unit to connect a handy terminal to data. By directly connecting to the transmission line, the same data can be shared with each control device on the data transmission line, and even if the console unit is separated from the transmission unit, the transmission unit can be left as it is on the data transmission line.

Further, according to the handy terminal of the present invention, the transmission section is provided with the station number designating means for designating its own station number, and the console section side receives this station number, so that the maintenance staff can receive it. Only the input and display of data corresponding to the station number can be permitted.

Further, according to the handy terminal of the present invention, the data processing means of the transmission section can add information to the transmission data depending on whether the console section is connected or not. The side can judge the status of the handy terminal.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a transmission system to which the handy terminal of the present invention is applied. In the figure, 1
Is a common serial transmission line of the control data transmission system,
A plurality of control devices 2 are connected to the common serial transmission line 1, and the common serial transmission line 1 is connected between the control devices 2.
It is possible to exchange information with each other via.

Then, such a common serial transmission line 1
Handy terminal 3 is connected to. The handy terminal 3 is capable of directly communicating with each control device 2 through the common serial transmission line 1 and is capable of performing system setting and monitoring by data input by a maintenance person.

Although only one handy terminal 3 is shown in FIG. 1, a plurality of handy terminals 3 may be connected to a place where system maintenance / maintenance is performed, if necessary.
FIG. 2 shows a schematic configuration of the handy terminal 3.

In this case, the handy terminal 3 comprises a transmission section 4, a console section 6 and a connection cable 5 for connecting the transmission section 4 and the console section 6. Here, the transmission unit 4 is fixedly installed on the common serial transmission line 1, and the console unit 6 is detachable from the handy terminal 3 by disconnecting the connection cable 5.

FIG. 3 shows a schematic configuration of the transmission section 4. In the figure, reference numeral 41 denotes a CPU. An internal bus 42 is connected to the CPU 41, and a media access control unit (MAC) 43, a ROM 44, and a RAM are connected to the internal bus 42.
A switch 47 and a dual port memory (DPRAM) 48 are connected via 45 and a gate 46, respectively.
Further, the common serial transmission line 1 is connected to the MAC 43 via a transmission / reception circuit 49.

Here, the CPU 41 controls the transmission section 4 as a whole and also processes transmitted and received data. The MAC 43 performs line control on the transmission path and cyclic control of the transmission right. This MAC43
The transmission / reception circuit 49 connected to is for converting the internal logic signal on the MAC 43 side and the signal on the common serial transmission line 1. The ROM 44 also stores a control program for the CPU 41. The RAM 45 is the CPU 41
Stores transmission / reception data associated with data transmission / reception processing, data to be used temporarily, and the like. Switch 4
7 sets the station number, and gate 46
To the internal bus 42 via. DP
The RAM 48 is for exchanging data with the console unit 6, and is connected to the console unit 6 via the connection cable 5.

FIG. 4 shows a schematic configuration of the console section 6. In the figure, 61 is an input / display control circuit. An internal bus 62 is connected to this input / display control circuit 61, a key input section 63 and a display section 64 are connected to this internal bus 62, and a gate 65 is further connected. It is connected to the connection cable 5 of the transmission unit 4 via.

The input / display control circuit 61 controls the data input of the key input section 63 and the display on the display section 64. The key input unit 63 is for inputting various data necessary for system setting and monitoring. The display unit 64 displays according to various data input from the key input unit 63. The gate 65 is for accessing the DPRAM 48 of the transmission unit 4 via the connection cable 5.

Next, the operation of the embodiment configured as described above will be described. In this case, as a transmission system, as shown in FIG. 1, a plurality of control devices 2 are provided on a common serial transmission line 1.
, And information can be exchanged between these control devices 2 via the common serial transmission line 1.

For such a transmission system,
By directly connecting the handy terminal 3 to the common serial transmission line 1 and directly communicating with each control device 2, maintenance personnel can input data to enable system setting and monitoring.

The handy terminal 3 here is
Although FIG. 1 shows the case of one place, usually, a plurality of places are provided at points where maintenance / maintenance is required. In addition, the transmission unit 4 shown in FIG. 2 is fixedly installed on the common serial transmission line 1, and the console unit 6 disconnects the connection cable 5 from the handy terminal 3 so that the transmission unit 4 shown in FIG. It can be removed.

However, as a transmission system to which such a handy terminal 3 is applied, a system in which a transmission right is rotated at regular intervals in order to secure definite response,
For example, the implicit token passing method is used.

In this implicit token passing system, a plurality of control devices 2 and a handy terminal 3 connected to a common serial transmission line 1 are connected to stations STN1 ... STN1.
As STNn, station numbers are assigned to the stations STN1 to STNn. Then, for these stations STN1 to STNn, as shown in FIG. 5, the station with the smallest station number (STN1 in the illustrated example) is set as the master station, and the frame header pattern FH indicating the start of the transmission cycle is sent from this master station. And from then on, each station
STN1 to STNn know the transmission timing by counting the frames on the common serial transmission line 1, and sequentially transmit the transmission frames. In this case, each station STN1 ~ ST
Nn sends a dummy frame pattern DF when there is no data to be transmitted at the transmission timing so that the number of frames on the common serial transmission line 1 is always constant. Then, when the transmission of all stations STN1 to STNn has completed, the master station (STN1) again transmits the frame header pattern FH.
Is sent to return to the beginning of the transmission cycle.

In this state, at the handy terminal 3,
The station number is set by the switch 47 of the transmission unit 4, and this station number is stored in the specific area of the DPRAM 48.

Then, the station number stored in the DPRAM 48 is transferred to C via the gate 46 and the internal bus 42.
Read by PU41, MA via internal bus 42
Notify C43.

In this state, the CPU 41 creates a transmission frame, processes a received frame, and DPRAM 4
A protocol process such as an interface process with the input / display control circuit 61 of the console section 6 is executed via the server 8. For example, when various data necessary for system setting and monitoring is input from the key input unit 63 of the console unit 6,
The DPRAM 48 of the transmission unit 4 is accessed from the input / display control circuit 61 via the gate 65, and various data is stored in the transmission area of a predetermined address from the key input unit 63. Then, the CPU 41 creates a transmission frame from the data on the DPRAM 48, and based on the cyclic control of the transmission right by the MAC 43, the transmission / reception circuit 49 causes the common serial transmission path 1 to be transmitted.
Is transmitted with a predetermined transmission cycle.

On the other hand, a transmission frame from each control device 2 connected to the common serial transmission line 1 is received via the transmission / reception circuit 49, and the DPRAM 48 is accessed based on the frame information received by the frame processing in the CPU 41, and at the same time, predetermined. Store the received data in the address of.

Then, the received data stored in the DPRAM 48 by the input / display control circuit 61 of the console section 6,
That is, the data received from each control device 2 is read and displayed on the display unit 64.

By doing so, it becomes possible to realize system setting and monitoring for the control data transmission system in which the plurality of control devices 2 are connected to the common serial transmission line 1 by the handy terminal 3.

In this case, each station STN1 to STNn transmits each transmission frame in a predetermined transmission cycle by information communication, so that all stations STN1 to STNn are transmitted.
Can share the same data at high speed. Also,
In the frame received from each station STN1 to STNn, a field indicating each status is provided. Especially, in the handy terminal 3, the console section 6 is provided.
If is not connected, set the bit of connected device error in this status field.

As a result, if the other control device 2 determines that there is no device error bit in the status field of the frame received from the handy terminal 3, the console unit 6 is connected and it is determined that there is a device error bit. For example, it can be determined that the console unit 6 is not connected.

In the console section 6, the DPRAM 4
By reading the station number stored in the specific area No. 8, only the input / display function corresponding to the station number is permitted to the maintenance staff. In other words, the station number is set by the switch 47 of the transmission unit 4, but this station number indicates the position where the transmission unit 4 is fixedly installed, and a function not used outside that place is requested by the maintenance personnel. Even if it is done, it is rejected to prevent malfunction by human system.

Therefore, according to this embodiment, since the handy terminal 3 can be directly connected to the common serial transmission line 1 together with the plurality of control devices 2 and the same data can be shared, the common serial transmission line 1 can be operated at high speed. It becomes possible to communicate with each control device 2.

In addition, the handy terminal 3 has a transmission section 4
Fixedly installed on the common serial transmission line 1,
Since the console unit 6 can be separated from the transmission unit 4, the transmission unit 4 remains on the common serial transmission line 1 even if the console unit 6 is removed. It is possible to prevent adverse effects and obtain stable operation.

Further, by passing the station number designated by the transmission section 4 to the console section 6, the console section 6 permits only the display / input function corresponding to the station number to the maintenance personnel, and It is also possible to prevent erroneous operation by the system.

Furthermore, in the transmission unit 4 of the handy terminal 3, when the console unit 6 is not connected, the bit of the abnormal connection device is set in the status field of the transmission frame. From the presence or absence of this bit, the status of the handy terminal 3, that is, the failure of the transmission section 4 and the console section 6
It is also possible to determine whether or not to connect.

The present invention is not limited to the above-mentioned embodiments, and can be carried out by appropriately modifying it without departing from the scope of the invention.
For example, in the above-described embodiment, the transmission line 4 has a bus configuration, but the bus configuration is not particularly limited. Therefore, the same is possible with a loop or star configuration. Further, in the above-described embodiment, the implicit token passing system is adopted for the media access control, but there is no particular problem as long as the transmission right is a system which always circulates to all stations within a fixed time. For example, the same can be done by adopting the IEEE804.4 token bus system.

[0040]

As described above, according to the present invention, the transmission / reception control means and the transmission / reception control means are provided in the data transmission line of the data transmission system which enables information exchange between a plurality of control devices via the common data transmission line. Since the transmission unit having the data processing unit is fixedly installed, while the console unit having the data input unit for inputting the data and the display unit for displaying the transmitted / received data can be detachably connected to the transmission unit, Since the handy terminal can be directly connected to the data transmission line and the same data can be shared with each control device on the data transmission line, high speed communication with each control device becomes possible. Moreover, even if the console section is separated from the transmission section, the transmission section can be left as it is on the data transmission path, so that adverse effects on the transmission system due to attachment / detachment of the handy terminal can be reliably prevented, and stable operation can be obtained.

Further, according to the handy terminal of the present invention, the transmission section is provided with the station number designating means for designating its own station number, and the console section side receives this station number, so that the maintenance staff can receive it. Since only the input and display of data corresponding to the station number can be permitted, it is possible to prevent erroneous operations by humans.

Further, according to the handy terminal of the present invention, since the data processing means of the transmission section can add information according to the presence / absence of connection of the console section to the transmission data, this information is transmitted via the data transmission path. Each control device can judge the status of the handy terminal and can always check.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a transmission system to which an embodiment of the present invention is applied.

FIG. 2 is a diagram showing a schematic configuration of a handy terminal according to an embodiment.

FIG. 3 is a diagram showing a schematic configuration of a transmission unit of a handy terminal according to an embodiment.

FIG. 4 is a diagram showing a schematic configuration of a console unit of a handy terminal according to an embodiment.

FIG. 5 is a diagram showing a data transmission timing of an implicit token passing method applied to one embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Common serial transmission line, 2 ... Control device, 3 ... Handy terminal, 4 ... Transmission part, 41 ... CPU, 42 ... Internal bus, 43 ... Media access control part (MAC), 44 ... ROM, 45 ... RAM, 46 ... gate, 47 ... switch, 48 ... DPRAM, 49 ... transmission / reception circuit, 5 ... connection cable, 6 ... console part, 61 ... input / display control circuit, 62 ... internal bus, 63 ... key input part, 64 ... display part, 65 ... Gate.

Claims (3)

[Claims] 1. A handy terminal directly connected to the data transmission path of a data transmission system, which enables information exchange between a plurality of control devices via a common data transmission path, wherein the handy terminal is fixed to the data transmission path. And a transmission section having a transmission / reception control means for controlling transmission / reception of data to / from the control device with respect to the data transmission path, a transmission section having data processing means for processing data transmitted / received by the transmission / reception control section, and the transmission section. A data input means for inputting data transmitted from the transmission / reception control means to the data transmission path, and a console section having display means for displaying transmission / reception data processed by the data processing means. Handy terminal characterized by having. 2. The transmission unit has station number designating means for designating its own station number, and when the console unit receives the station number from the transmission unit, the console unit inputs data corresponding to the station number. 2. The handy terminal according to claim 1, wherein only the input and the display are permitted to the input means and the display means. 3. The data processing means of the transmission unit has a function of adding information depending on whether or not the console unit is connected to the transmission data.
The handy terminal shown.