JPS63232541A - Multiplex transmission system - Google Patents

Abstract

PURPOSE:To optionally correspond an input signal and an output signal at every one point by providing a setting means setting a terminal constitution table and a net lift file on a master terminal. CONSTITUTION:The master terminal 6 having a function generalizing and con trolling a whole system is connected to a transmission line 1 and a setting device 7 is connected to the terminal 6. without adding the address data of a source and a destination at every transmitted data, the control of correspon dence for which the respective input terminals and the respective output terminals of the respective slave terminals 2-5 are made optionally correspond one another at every point is executed at the master terminal 6 as, shown in dotted lines, and the setting unit 7 the concrete contents of the correspondence can optionally set by a setting device 7. Thus, the respective input terminals and the respective output terminals of the respective terminals can be optionally corresponded with one another at every point.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multiplex transmission system for wire saving in factories, plants, etc., for example.

[Conventional technology]

One example of this type of multiplex transmission system is the one shown in FIG.

That is, terminals 2 to 5 provided at points A to D are connected to the transmission line 1, and each terminal has a transmission control unit for multiplex communication according to, for example, an HDLC procedure (high-level data link control procedure). 21.3
1.41.51 and input section 22 for input interface
．． 32.52 and/or an output section 33.43.53 for an output interface. TRI~TR4
, T, Il~T34, T41~T44, T51~TS4
are input or output terminals, respectively.

In this example, one of the terminals 2 to 5 also has a mask function for controlling the entire system.

In the conventional multiplex transmission system as described above, each terminal is used as shown by the broken line in the figure, or each terminal is used if there are multiple input units and output units within the terminal, unlike the illustrated example. In addition, the transmission source and destination are associated (linked) for each human output unit within the terminal, and data is transmitted in a predetermined order based on the correspondence. be done. This is to make the ratio of address data in the transmitted data as small as possible and to perform transmission efficiently.

For example, in the illustrated example, terminals 2 and 4 are associated with each other, and the terminal T of the input section 22 of terminal 2 is
The input signals inputted to z, , Ttz are outputted as output signals from the terminals T4 and T4□ of the output section 43 of the terminal 4, respectively.

[Problem that the invention seeks to solve]

However, the multiplex transmission system as described above is capable of transmitting data on a terminal-by-terminal basis or, in addition, on a human output unit-by-terminal basis.
Due to the correspondence between receptions, the system lacks flexibility, and when it is actually incorporated into a system in a factory or the like, there is a problem in that unnecessary terminals and input/output sections are unnecessarily used.

For example, in FIG. 5, the terminal TZ3 of the input section 22 of terminal 2 and the terminal T3 of the output section 33 of terminal 3
Even if terminal 4 is vacant, both terminals 2 and 3 are not associated with each other, so the input signal of terminal 'r'zz cannot be transmitted as output number 3 of terminal T34, and in this case, the It is necessary to deal with this problem by adding another terminal having at least an input section at point A and another terminal having at least an output section at point B.

However, by doing so, the empty input terminals and ejecting output terminals of terminals 2 and 3 that are already at both points ASB, as well as the empty input terminals and ejecting output terminals of the terminals newly added to both points, will be effectively used. It would be a complete waste.

For example, when it comes to wiring in factories and plants, it is difficult to determine the details in advance, such as how many points of human power to send to which points, so the above-mentioned method is difficult. problems occur frequently.

To deal with this, there is an idea of attaching source and destination address data to each transmission data and transmitting it, but if this is done, the proportion of address data in the transmitted data becomes extremely large, and the transmission It becomes inefficient and defeats the initial purpose.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multiplex transmission system that allows input signals and output signals to be arbitrarily associated on a point-by-point basis without causing such problems.

〔Example〕

First, an overview of the multiplex transmission system according to the present invention will be explained in the first part.
This will be explained with reference to the figures.

In this example, transmission path 1 of the system as shown in FIG.
Furthermore, a master terminal 6 having a function of controlling the entire system is connected, and a setting device 7 is connected thereto. Note that since none of the terminals 2 to 5 have a masking function, they will be referred to as slave terminals hereinafter.

In this example, without attaching source and destination address data to each transmission data, for example, as shown by the broken line in the figure, each slave terminal 2 to 5
Each input terminal and each output terminal can be arbitrarily associated on a point-by-point basis. Control of the correspondence is performed by the master terminal 6, and the specific contents of the correspondence can be arbitrarily set by the setting device 7.

Therefore, for example, even in the case mentioned in the conventional problem, if the empty input terminal T of the input section 22 of the slave terminal 2
Since 'zs can be associated with the empty output terminal T34 of the output section 33 of the slave terminal 3, these can be used effectively, and there is no need to add new slave terminals at points A and B.

A specific example will be explained below.

FIG. 2 is a block diagram showing an example of the basic configuration of the master terminal shown in FIG. 1. The master terminal 6 in this example is
CPUs 61 and R interconnected by an internal bus 64
It is equipped with an OM 62, a RAM 63, a communication control section 65 according to the HDLC procedure described above, and an interface section 66. The communication control section 65 is connected to the transmission path 1 described above, and the interface section 66 is connected to the setting device 7 described above. .

These CPU 61, ROM 62, RAM 63, internal bus 64, and communication control unit 65 are connected to the transmission control unit 2 described above.
Corresponds to 1 to 51.

Note that the master terminal 6 may also have a function as a slave terminal, that is, an input/output function. In that case, as shown by the two-dot chain line in the figure, the input section 6
7 and/or an output section 68 may be further provided.

Moreover, the basic configuration of each of the slave terminals 2 to 5 is as follows:
For example, in the figure, the interface unit 6 with the setting device 7
It is as if an input section 67 and/or an output section 68 were provided instead of providing the input section 6.

FIG. 3 shows an example of the register configuration in the master terminal 6 as described above. Specifically, these include, for example, the second
You may use a predetermined area in the RAM 63 shown in the figure, or
Alternatively, something like EE"'FROM may be provided separately for that purpose.

The input data buffer 83 is connected to each terminal (basically each slave terminal 2 to 5 degrees, but the master terminal 6
As mentioned above, when the terminal also has an input/output section, it also includes the master terminal 6. same as below. ) is temporarily stored in accordance with the instruction of the pointer in the collection control register 82.

The concentrating control register 82 stores a pointer indicating, for each terminal, the storage location in the input data buffer 83 of input data sent from each terminal. Therefore, access to the input data buffer 83, ie, writing and reading of input data, is performed for each terminal according to this pointer.

Note that input/output data between each terminal is transmitted in batches for each terminal in order to improve transmission efficiency. In that case, identification data indicating which input terminal or output terminal the data is directed to within each terminal is attached to the data. More specifically, only the bit at the position corresponding to the input terminal or output terminal where the data to be sent is set to "1", and then the data to be sent is packed and sent.

The output data buffer 184 temporarily stores data transferred from the input data buffer as will be described later, as output data to be output from each terminal, according to the instructions of the pointer in the distribution control register 85.

Stored in the distribution control register 85 is a pointer that indicates, for each terminal, the storage location within the output data buffer 84 of the output data to be sent to each terminal. Therefore, access to the output data buffer 84, ie, writing and reading of output data, is performed for each terminal according to this pointer.

The correspondence table register 81 stores a correspondence table consisting of a terminal configuration table 81a set by the setting device 7 and a netlist file 81b.

This terminal configuration table 81a represents the configuration of each terminal, for example, how many input or output units each terminal has, how many input terminals or output terminals each unit has, etc. By using this, it is possible to deal with differences in terminal configurations. In other words, the reason why such a terminal configuration table 81a is used is because, as mentioned above, data transmission between each terminal is performed in batches for each terminal, so it is important to know which terminal the specific data therein corresponds to. This is because it is necessary to identify.

The netlist file 8.1b represents the connection between each input terminal and each output terminal of the entire system for each terminal. Specifically, the position on the source side, that is, the terminal number on the source side, the unit number of the input part in the terminal, and the terminal number in the input part, and the position on the destination side, that is, the terminal number on the destination side, the terminal number in the terminal. The unit number of the output section and the terminal number within the output section are individually associated with each other.

When transferring the input data in the input data buffer 83 described above to the output data buffer 84 as output data, transfer the input data in the input data buffer 83 as output data to the output data buffer 84 based on the terminal configuration table 81a and the netlist file 81b, and in the transfer control register 82 and distribution. This is done in response to control register 85.

That is, by specifying the source-side terminal based on the pointer in the concentrating control register 82 and specifying the terminal position within the terminal using the terminal configuration table 81a, a specific terminal position is specified from the input data bath sofa 83. call the input data.

Then, determine which terminal on the destination side the input data should be transmitted as output data.
It is specified by the netlist file 81b.

Then, the pointer in the distribution control register 85 specifies which area in the output data buffer 84 the data is to be stored as output data, and the terminal configuration determines in which position within that area (that is, in which order) the data is to be stored. It is specified in the table 81a and stored there as output data.

Thereafter, by repeating the same operation, the human data collected for each terminal on the source side and stored in the input data buffer 83 is distributed to the transmission information, and then collected for each terminal on the destination side. The output data is stored in the output data buffer 84.

Then, the output data is transmitted from the output data buffer 84 to each terminal.

In addition, each of the above-mentioned operations specifically includes: (1) a collection cycle in which the input data of the entire system is collected from each terminal to the master terminal; a transfer cycle in which the input data is reconfigured as output data; and the entire system. This is done in the distribution cycle that distributes the output data to each terminal. This will be explained with reference to FIG. 4 as follows.

That is, in the system as shown in FIG.
-5 to request input data (step 101), each slave terminal 2-5 returns input data when it is called (step 201), and master terminal 6 requests input data to each slave terminal 2-5. (step 102) and stores it in the input data buffer 83 as described above.

Next, in the transfer cycle, in the master terminal 6, the input data in the input data buffer 83 is converted into correspondence in units of one manual data and one output data based on the correspondence table, that is, the terminal configuration table 81a and the netlist file 81b. Then, the input data is reconfigured and transferred to the output data bath sofa 84 and stored as output data (step 103).

Then, in a distribution cycle, from the output data buffer 84 in the master terminal 6 to each slave terminal 2
The output data is transmitted every .about.5 times (step 104). Each slave terminal 2 to 5 receives output data addressed to its own station (step 202), and outputs an output signal from the output section of its own station.
The data is then bound and output (step 203).

Although the master terminal 6 has been described as being independent, it goes without saying that the same functions as the master terminal 6 may coexist in any other terminal.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to arbitrarily associate each input terminal and each output terminal of each terminal point by point without attaching source and destination address data to each transmission data. can. In other words, according to the present invention, a highly flexible multiplex transmission system can be realized, thereby eliminating waste due to empty inputs and empty outputs as in the prior art.

Therefore, for example, even when the multiplex transmission system is actually incorporated into a system in a factory, plant, etc., the actual wiring work can be carried out even if the details of the entire system have not been determined. In other words, the specific input signal to be connected to which output signal (P wiring) can be set using the setting device mentioned above when the details of the system have been decided, so it depends on the construction plan and actual construction. It makes progress a lot easier. Furthermore, no restrictions or waste occur when changing or expanding the system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration example of a multiplex transmission system according to the present invention. FIG. 2 is a block diagram showing an example of the basic configuration of the master terminal shown in FIG. 1. Third
The figure is a diagram showing an example of the register configuration of the master terminal in FIG. 1. FIG. 4 is a flowchart showing an example of communication operation in the multiplex transmission system of FIG. 1, with (A) showing the master terminal side and (B) showing the respective slave terminal sides. FIG. 5 is a block diagram showing a schematic configuration example of a conventional multiplex transmission system. 1...Transmission line, 2-5..., Slave terminal, 6
... Master terminal, 7... Setting device, 81...
Correspondence table register, 81a...Terminal configuration table, 81b...Netlist file, 8210. Concentration control register, 83... Input data buffer, 84.
...Output data buffer, 85...Distribution control register.

Claims (1)

[Claims] (1) A master terminal that has at least a function to centrally control the entire system, and a function that has multiple input terminals and sends input signals input to each input terminal as input data to the master terminal in a predetermined order. One or more slave terminals and one or more units that have multiple output terminals and have at least the function of receiving output data sent in a predetermined order from the master terminal and outputting it as an output signal from each output terminal. A multiplex transmission system comprising a slave terminal and a transmission line connecting the master terminal and each slave terminal, the master terminal having input data storage means for storing input data input to each terminal, and an input data storage means for storing input data input to each terminal. A collection control means that accesses the data storage means for each terminal, a terminal configuration table storage means that stores a terminal configuration table representing the configuration of each terminal, and a connection between each input terminal and each output terminal of the entire system. netlist file storage means for storing a netlist file representing a representation; output data storage means for storing output data to be output from each terminal; distribution control means for accessing the output data storage means for each terminal; data transfer means for transferring input data in the input data storage means to the output data storage means as output data based on the configuration table and the netlist file and in response to the collection control means and the distribution control means; A multiplex transmission system, further comprising setting means for setting the terminal configuration table and netlist file for a master terminal.