JP3770296B2 - Network terminal equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a terminal device that is connected to the lowest layer of an information transmission network laid in a factory or the like and controls a switch, a lamp display, and the like in units of one point.
[0002]
[Prior art]
Conventionally, one type of information transmission network laid in factories, etc., each terminal is connected in parallel to a bus consisting of two cables (multi-drop type), and communication control between terminals is performed using a polling / selecting method. There is something to do.
FIG. 8 shows the configuration, in which the master 1 is connected to the lower side of the host device 5, and the master 1, the power source 2, and the plurality of terminals 3 are connected by a transmission cable 4 with two core wires. Each terminal 3 is assigned one address.
[0003]
FIG. 9 is a diagram showing the configuration of the terminal 3 of FIG. 8, in which an address memory 12 is connected to the terminal controller 10, and the assigned address is written therein. Each terminal 3 has four input / output terminals 13 and performs input / output processing of 4-bit data. These terminals 3 are generally used at a factory manufacturing site or the like, and are used to control a signal in bit units such as ON / OFF of a switch and blinking of a lamp.
[0004]
[Problems to be solved by the invention]
However, since the terminal 3 having the above-described configuration includes only the four input / output terminals 13, when a larger amount of data is to be handled for data display, printing, etc., a plurality of terminals 3 are provided. There has been a problem that the number of bits must be increased by using it, which increases the cost.
[0005]
[Means for Solving the Problems]
To solve the above problems, the invention according to claim 1 is a connected Ru terminal to a network communicated controlled by polling selecting system is connected to a multi-drop shaped by two-wire cable ,
This terminal device
An address memory for storing M addresses (M is an integer of 2 or more) assigned to the terminal ;
And N × M pieces of the input and output terminals assigned as N (N is an integer not smaller than 2) one unit for every one address,
When the address sent from the master matches any of the M addresses stored in the address memory, it is determined that the address is for the own terminal, and N corresponding to the address is determined according to polling from the master. a signal value input to the input and output terminals for inputs and serial transmission to the master, or / and by selecting operation from the master input and for the N output corresponding data it has been serially transmitted to the corresponding address A control unit that outputs to the power terminal ;
The features and kite provided.
[0006]
A second aspect of the present invention, a connected Ru terminal device to a network communicated controlled by polling selecting system is connected to a multi-drop shaped by two-wire cable,
This terminal device
A numerical value setting circuit for setting an address allocation number S (S is an integer of 2 or more);
An address memory for storing S addresses assigned to the terminal ;
N × S input / output terminals assigned with N (N is an integer of 2 or more) as one unit for each address;
If the address sent from the master matches one of the addresses in the range of consecutive allocation numbers S starting from the address stored in the address memory, it is determined that the address is sent to the own terminal , corresponding address data that has been serially transmitted by the selecting from a signal value input to the input and output terminals for N inputs corresponding to the relevant address and serially transmitted to the master and / or master, in response to the polling a controller for outputting to the input and output terminals for the N output corresponding to,
The features and kite provided.
[0007]
A third aspect of the present invention, a connected Ru terminal device to a network communicated controlled by polling selecting system is connected to a multi-drop shaped by two-wire cable,
This terminal device
Mode setting means for switching to a mode in which all addresses are assigned by an open / close signal of a mode setting switch;
An address memory for storing the address assigned to the terminal ;
N (N is an integer of 2 or more) × (total number of addresses) I / O terminals ,
In a state where the mode assigning the entire address has been set, the input to the input and output terminals of all address sent from the master determines that the addressed to its own terminal, corresponding to all the addresses in response to the polling from the master and a control unit which is being output a signal value serially transmitted to the master, or / and the data that has been serially transmitted by the selecting from the master to the input and output terminals corresponding to all addresses,
The features and kite provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of a terminal device according to the invention of claim 1, and this terminal device corresponds to the terminal 3 connected to the network shown in FIG. In FIG. 1, reference numeral 10 denotes a controller, which is connected in parallel to the transmission cable 4 via a pair of branch lines 11. The address memory 12 connected to the controller 10 stores M (M is an integer of 2 or more) addresses. The controller 10 is connected to an input / output data processing unit 15 via an address selection line 14 and four data lines 18, and the input / output data processing unit 15 includes a plurality of input / output terminals 13. Is connected. Usually, the number of the input / output terminals 13 is 4 × M, and the input / output terminals 13 correspond to each address in units of four.
[0009]
In this terminal device, a signal fetched from the branch line 11 is received by the controller 10, and address verification is first performed. Specifically, in response to an address call from the master, it is determined whether or not it matches with M addresses set in its own address memory 12, and if it matches any of these addresses, the input / output data processing unit In the case of polling 15, data input to the input / output terminal 13 corresponding to the address is transmitted to the master at a timing following the address.
[0010]
In the case of selecting, the data sent following the address is output to the input / output terminal 13 corresponding to the address. By repeating this operation, the input / output data processing section 15 executes input / output of data for the same number of terminals as the number M of addresses set in its own address memory 12, that is, 4 × M bit data.
[0011]
FIG. 2 is a block diagram showing the configuration of the terminal device according to the invention of claim 2, and this terminal device corresponds to the terminal 3 connected to the network shown in FIG. In FIG. 2, reference numeral 10 denotes a controller, which is connected in parallel to the transmission cable 4 via a pair of branch lines 11. One address is stored in the address memory 12 connected to the controller 10. Further, an input / output data processing unit 15 is connected to the controller 10 via an address selection line 14 and four data lines 18.
[0012]
The controller 10 is connected to a plurality of switches 16 constituting a numerical value setting circuit, and an address allocation number S (S is an integer of 2 or more) is set by a combination of opening and closing these switches 16. . This assigned number S represents the number of addresses assigned to this terminal device, and specifically, S consecutive addresses starting from the address stored in the address memory 12.
The input / output data processing unit 15 is connected to 4 × S input / output terminals 13. These input / output terminals 13 correspond to each address in units of four.
The address assignment number S can be set in advance by storing the assignment number S in a memory without using the switch 16.
[0013]
In this terminal device, a signal fetched from the branch line 11 is received by the controller 10, and address verification is first performed. Specifically, in response to an address call from the master, it is determined whether or not it matches the S consecutive addresses starting from the address set in its own address memory 12, and any one of the addresses is determined. If they match, in the case of polling, the input / output data processing unit 15 transmits the data input to the input / output terminal 13 corresponding to the address to the master at the timing following the address.
[0014]
In the case of selecting, the data sent following the data is output to the input / output terminal 13 corresponding to the address. The input / output data processing unit 15 repeats this operation to input / output data corresponding to the terminal corresponding to S consecutive addresses starting from the address set in its address memory 12, that is, 4 × S bit data. Is executed.
[0015]
FIG. 3 shows the operation of the embodiment of FIG. 1, and the upper axis of the figure shows the timing of data transmission and response between the master 1 and the terminal 3 on the network. Then, a response 31 is transmitted from the terminal 3.
The lower row shows the input / output relationship of data in the terminal device in which “address 10” is stored in the address memory 12 and the set number of switches 16 is “3”. In FIG. When transmitted, the address is collated in the collation period 32. However, since the first command 30 designates the address 9, the collation results in a mismatch.
[0016]
Since the next command 30 designates the address 10 and matches as a result of the collation, data is received from the master in the next data reception period 33, and further data is sent to the master in the subsequent response data output period 34. Send. In the same way, until the next command 11 specifying the address 11 and the address 12, the matching is matched, and data reception and data transmission are executed. The next address 13 is an address mismatch and data transmission / reception is not performed.
[0017]
FIG. 4 is a block diagram showing the configuration of a terminal device according to the invention of claim 3. This terminal device corresponds to the terminal 3 connected to the network shown in FIG. In FIG. 4, reference numeral 10 denotes a controller, which is connected in parallel to the transmission cable 4 via a pair of branch lines 11. The controller 10 is connected to a mode setting switch 17 for switching all address setting modes. The controller 10 is connected to an input / output data processing unit 15 via an address selection line 14 and four data lines 18, and the input / output data processing unit 15 includes a plurality of input / output terminals 13. Is connected. Usually, the number of input / output terminals 13 is 4 × (total number of addresses), and the input / output terminals 13 correspond to each address in units of four.
[0018]
In this terminal device, when the switch 17 is closed, the entire address setting mode is set, and data transmission / reception processing is executed with all addresses transmitted from the master addressed to the own terminal. When the switch 17 is opened, a normal mode is set, and data transmission / reception processing is executed in response to only a single address designated as described in the conventional example.
[0019]
FIG. 5 shows the operation of the embodiment of FIG. 4, and the upper axis of the figure shows the timing of data transmission and response between the master 1 and the terminal 3 on the network. Is transmitted, and then the response 31 is transmitted from the terminal 3.
The middle row shows the input / output relationship of data in the terminal device in which the switch 17 is closed and the all address setting mode is set. In the figure, when a command 30 is sent from the master 1 in order of addresses, Check the address.
[0020]
Here, since all addresses are set, the collation result is always the same, the data from the master 1 is received in the next data reception period 33, and the data is transmitted to the master 1 in the subsequent response data output period 34. To do. Next, the address is updated at a timing 35 shown in the lower stage, and the next address is transmitted from the master 1. Thereafter, all addresses are similarly determined to be addressed to the own terminal, and data transmission / reception processing is executed.
[0021]
FIG. 6 shows a specific example of the configuration of the input / output data processing unit 15 and the output unit of each of the above-described embodiments. 25. When data for a plurality of terminals are sequentially input from the controller 10, they are held in latches 24a to 24d corresponding to the terminals.
[0022]
The data held in the latches 24a and 24b is sent to display drivers 20a and 20b provided outside, and the values are displayed on the display devices 21a and 21b formed of 7-segment display elements. The data held in the latch 24c is output to the outside as the data signal 22. Similarly, the data held in the latch 24d is converted into a data strobe signal 23 and output to the outside.
FIG. 7 shows the output timing of the data signal 22 and the data strobe signal 23 output externally in FIG.
[0023]
In these embodiments, the terminal 3 in which a plurality of addresses are set manages and arranges transmission / reception data for each address as shown in FIG. 6, and performs signal processing according to the purpose of use such as display and parallel data output. To do. A circuit for realizing this control can be configured by selecting a simple logic circuit, CPU, gate array or the like according to the application.
In addition, when increasing the number of input / output points of a terminal device, not all signals are handled as data. In addition to display data, display digit control in multi-digit display, display mode switching (flashing, multiple data It can also be used for control signals (switching display, decimal point control, etc.).
[0024]
Similarly, by generating parallel data + data strobe signal for the printer, it is possible to output to the printer.
In addition, it can be used for multipoint input. It can also be used as an ACK response to each of the matrix switch board status reading and multi-point display output.
Furthermore, by receiving the received 4-bit data input / output from the terminal and the address information obtained in synchronization therewith, storing the signal in the internal storage element, and processing the data based on this data, It can be used as a multi-point input / output terminal.
[0025]
In addition to realizing the above function by arranging only one terminal with all addresses assigned on the bus consisting of the transmission cable 4, the data for all terminals can be transmitted far away via the transmission cable 4. It can also be used for transmission.
In each of the above-described embodiments, the number N of input / output terminals of one terminal device corresponding to one address is four, but it is naturally possible to configure the number of terminals other than four.
[0026]
【The invention's effect】
As described above, according to the present invention, even a single terminal device can input and output a large amount of data by polling and selecting multiple addresses or all addresses addressed to the terminal device itself. become. As a result, the number of terminal devices to be installed can be reduced and a network system can be configured at low cost.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the configuration of an embodiment of the invention of claim 1;
FIG. 2 is a block diagram showing a configuration of an embodiment of the invention of claim 2;
FIG. 3 is a timing diagram illustrating the operation of the embodiment of FIG.
FIG. 4 is a block diagram showing a configuration of an embodiment of the invention of claim 3;
FIG. 5 is a timing diagram illustrating the operation of the embodiment of FIG. 4;
FIG. 6 is a diagram illustrating a configuration of an input / output data processing unit and an output unit thereof according to each embodiment.
7 is a timing chart showing an example of output from the output unit of FIG. 6. FIG.
FIG. 8 is a diagram showing a configuration of a network to which the present invention is applied.
FIG. 9 is a diagram showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Master 2 Power supply 3 Terminal 4 Transmission cable 5 Host apparatus 10 Terminal controller 11 Branch line 12 Address memory 13 Input / output terminal 14 Address selection line 15 Input / output data processing part 16, 17 Switch 18 Data line 20a, 20b Display driver 21a , 21b Display 22 Data signal 23 Data strobe signals 24a-24d Latch 25 Address decoder 30 Command 31 Response 32 Verification period 33 Data reception period 34 Response data output period

Claims (3)

Is connected to a multi-drop shaped by two-wire cable to a connected Ru terminal device to a network communicated controlled by polling selecting system,
This terminal device
An address memory for storing M addresses (M is an integer of 2 or more) assigned to the terminal;
And N × M pieces of the input and output terminals assigned as N (N is an integer not smaller than 2) one unit for every one address,
When the address sent from the master matches any of the M addresses stored in the address memory, it is determined that the address is for the own terminal, and N corresponding to the address is determined according to polling from the master. a signal value input to the input and output terminals for inputs and serial transmission to the master, or / and by selecting operation from the master input and for the N output corresponding data it has been serially transmitted to the corresponding address A control unit that outputs to the power terminal;
Network terminal device comprising a kite comprising a. Is connected to a multi-drop shaped by two-wire cable to a connected Ru terminal device to a network communicated controlled by polling selecting system,
This terminal device
A numerical value setting circuit for setting an address allocation number S (S is an integer of 2 or more);
An address memory for storing S addresses assigned to the terminal;
N × S input / output terminals assigned with N (N is an integer of 2 or more) as one unit for each address;
It determined to be addressed to its own terminal if the address transmitted from the master matches one of the addresses in the range of the allocation number S of successive to the top address stored in the address memory, from the master corresponding address data that has been serially transmitted by the selecting from a signal value input to the input and output terminals for N inputs corresponding to the relevant address and serially transmitted to the master and / or master, in response to the polling a controller for outputting to the input and output terminals for the N output corresponding to,
Network terminal device comprising a kite comprising a. Is connected to a multi-drop shaped by two-wire cable to a connected Ru terminal device to a network communicated controlled by polling selecting system,
This terminal device
Mode setting means for switching to a mode in which all addresses are assigned by an open / close signal of a mode setting switch;
An address memory for storing the address assigned to the terminal;
N (N is an integer of 2 or more) × (total number of addresses) I / O terminals,
In a state where the mode assigning the entire address has been set, the input to the input and output terminals of all address sent from the master determines that the addressed to its own terminal, corresponding to all the addresses in response to the polling from the master and a control unit which is being output a signal value serially transmitted to the master, or / and the data that has been serially transmitted by the selecting from the master to the input and output terminals corresponding to all addresses,
Network terminal device comprising a kite comprising a.

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