JPS6126158A - Transmitting device of information - Google Patents

Abstract

PURPOSE:To treat easily and flexibly the increase, change or the like of I/O units without changing the program of a microprocessor by setting up mounting codes indicating inherent addresses and the kinds of I/O units. CONSTITUTION:A mounting code generator 7 formed in each I/O unit sets up a mounting code indicating the functional kind of the I/O unit, and when a gate 4 is opened, sends the code to a data bus. At the time of initial operation, the mounting codes returned from respective I/O units are stored in a transmission information control table 10 formed in a CPU so as to correspond to respective addresses and the CPU can detect the kinds of the I/O units by referring the mounting codes. Consequently, the I/O units can be increased or changed by setting up and storing the mounting codes indicating the inherent addresses and the kinds of the I/O units in the table 10 and making the CPU refer the contents of the table 10 without changing the program. Namely, said processing can be performed only by the setting or change of the mounting codes indicating the address setting and the kinds of the I/O units.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an information transmission device that inputs various monitoring information, measurement information, etc. from peripheral circuits and sends transmission information frames to a communication line under the control of a microprocessor. In particular, this invention relates to improvements for flexibly responding to the addition of peripheral circuits, etc.

BACKGROUND ART Conventionally, as shown in FIG. 6(A), this type of information transmission device has a microprocessor CPU as its center, a monitoring information input/output unit DI-8V, an analog measurement information input/output unit (AI), and a modulation transmission unit. MO[1-PS and other input/output devices and memory MEM are connected to the pass line BU.
The configuration is connected to S.

In general, information input/output units such as the monitoring information input/output unit) Ill-3V and the analog measurement information input/output unit) A1 are I10 when viewed from the microprocessor CPU.
External data such as monitoring information Sv and analog measurement information T, which operate as addressable peripheral devices and are input to the monitoring information input/output unit (DI-SV) and analog measurement information input/output unit (AI), etc. (8 or 18
The data is input to the microprocessor CPU in units of bits. That is, external data is sent onto the data bus from the input/output unit designated by the address signal sent from the microprocessor CPU onto the address bus.

As shown in the same figure (B), each input/output unit has an I10 address setting switch 1 in which a unique address assigned to it is set, an address set in the address setting switch 1, and an address on the address bus. It has an address-number output circuit 2 that compares signals with the address-number output circuit 2, and a gate G that sends external data to the data bus when opened by the match output output from the address-number output circuit 2. Sends external data onto the data bus when specified by a signal. When the external data is analog measurement information, it is of course converted into digital data and sent to the data bus.

On the other hand, the microprocessor CPU program has a transmission information table as shown in FIG. A transmission word address that is added when the data is transmitted is also written, and the microprocessor CPU performs a predetermined information transmission operation by referring to the above table when inputting data and transmitting data. I try to do that.

The above table is created at the manufacturer's factory according to the combination of input/output units when designing the information transmission device, and is stored and installed in a read-only memory (ROM).

Therefore, with conventional information transmission equipment, when expanding or changing existing equipment, it is necessary to create a ROM containing a new transmission information table and replace it with the old one at the site or factory. Modifying up to ten stations requires a great deal of time and effort, and has the disadvantage that it requires an engineer who is familiar with ROM writing and microprocessor programming.

OBJECTS OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional drawbacks, and to provide information that can easily and flexibly deal with additions and changes of input/output units, etc., without changing the microprocessor program. The purpose is to provide transmission equipment.

Structure of the Invention The information transmission device of the present invention connects various input/output units for inputting monitoring information, measurement information, etc., and a transmission unit for transmitting information inputted from each input/output unit to a communication line via a microbus. In an information transmission device that is connected to a processor and sends various input information to a communication line under the control of the microprocessor, each input/output unit is assigned a unique address and a mounting code indicating its type, and includes an address matching circuit that detects a match between an address signal sent out on the address bus and a unique address assigned to itself, and a control activated by the matching output of the address matching circuit and input from the microprocessor. The microprocessor includes a decoder that decodes the code and opens a corresponding gate as described below, and a gate that is connected between an output of external data or the implementation code generator and a data bus and is opened by the decoder output, and the microprocessor A transmission information management table is provided for storing the mounting code of the input/output unit in correspondence with the address of the unit, and the mounting code is sequentially returned from each input/output unit by an address signal and a control code during initial operation, After storing the implementation code returned from each input/output unit in the corresponding address of the above transmission information management table, and moving to the main operation,
A transmission information frame in which data is returned from each input/output unit implemented by referring to the transmission information management table, and the same word number as the address of the input/output unit is added to data obtained by performing predetermined processing on the returned data. It is characterized by being configured to send out.

Embodiments of the Invention Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

That is, each input/output device includes an address setting switch 1, an address/number configuration circuit 2, a decoder 3, and a gate 4.
, 5 and a mounting code generator 7 connected to the gate 4. For example, a unique address consisting of 6 bits is set in the address setting switch l, and the address-number construction circuit 2 compares the address signal on the address bus with the unique address set in the address setting switch l. ,=
The decoder 3 is activated by the matching output.

The decoder 3 decodes the control code sent from the microprocessor cP2. For example, when the control code is "0", the gate 4 is opened, and when the control code is "1", the gate 5 is opened.

A mounting code (for example, 4 bits) indicating the function type of the input/output unit is set in the mounting code generator 7, and the mounting code is sent onto the data bus when the gate 4 is opened. . 1 by 4-bit implementation code
Six types can be specified, and input/output units assigned the same implementation code are microprocessor c
The functions seen from the PU are the same. Gate 5 has monitoring information.

Actual data such as external data obtained by converting analog measurement information into digital data is input, and is sent onto the data bus when the gate 5 is opened.

The microprocessor CPU has an address counter 8 and a transmission information management table pointer 9 as shown in FIG.
and a transmission information management table 10, and in the transmission information management table 10, mounting codes returned from each input/output unit corresponding to addresses are stored at the time of initial operation, which will be described later. The transmission information management table 10 manages transmission information, and is referenced by a transmission program, which will be described later, when transmitting data. microprocessor cpu
can know the type of the corresponding input/output unit by referring to the implementation code stored in the transmission information management table 10. Note that a mounting code is returned from an unmounted input/output unit, but since no mounting code is stored at the corresponding address, the microprocessor CP
By referring to the transmission information management table 10, U
It becomes possible to know whether an input/output unit is installed and its type.

FIG. 3 is a flowchart showing the initial processing program of the microprocessor GPU that is executed when the power is turned on or when a reset is started. That is, "l" is set in the address counter 8, and the start address (STABL) of the transmission information management table 10 is set in the transmission information management table pointer 9. Next, the control code ゛O
", and the implementation code is returned from the input/output unit at address "1'°. The returned implementation code is stored at the address in the transmission information management table 10 pointed to by the transmission information management table pointer 9. Next, add 1 to the contents of address counter 8 and transmission information management table pointer 9,
By repeating the above operation until the content of the address counter 8 reaches 64, the implementation code is sequentially stored corresponding to the address of each input/output unit, and when the count value of the address counter 8 reaches 64, the initial operation is terminated, and the following steps are performed. Transition to normal operation as described in . Note that since no mounting code is returned for the address of an unmounted input/output unit, the content of the corresponding address in the transmission information management table 10 is 0000.

FIG. 4 is a flowchart of the transmission processing program of the microprocessor CPU. That is, first, the start address of the transmission information management table 10 is set in the transmission information management table pointer 9, the address counter 8 is cleared to "O", and the implementation starts from the address of the transmission information management table 10 pointed to by the transmission information management table pointer 9. After reading the code, add 1 to the address counter 8 and transmission information management table pointer 9, and set the above implementation code to 0000.
If so, by repeating the above operation, the transmission information management table IO is sequentially read out, and if the implementation code is other than oooo, the type of the corresponding input/output unit is determined based on the implementation code.0 For example, even if the implementation code is 0001. For example, a monitoring information input/output unit) DISV is assumed to be installed, and an input subroutine dedicated to inputting monitoring information is called to perform data input processing. The contents of the address counter 8 at that time (the read address of the input/output unit) are added to the data of the processing result, and the data is sent to the modulation transmitting unit).
Transfer to N0D-PS. If the implementation code is 0010, it is determined that an analog information unit is installed, and input from other types of input/output units that similarly perform analog information input processing and processing result data transfer processing. Data processing and transfer processing are also performed in the same manner.

After data transmission processing is performed by transferring the contents of the address counter (read address of the input/output unit) and data to the modulation transmission unit, if the contents of the address counter 8 are not 83, the transmission management table is read out. Return to Thereafter, data is sequentially read out from each input/output unit whose implementation code is stored in the transmission information management table 1O in the same manner, and predetermined processing is performed depending on the type, and the processed data is stored at the address of the input/output unit A mailing information frame with the same word number added is sent to the communication line. When the contents of the address counter 8 reach 83, the series of data transfer processing is completed, the start address of the transmission information management table 10 is set in the transmission information management table pointer 9 again, and the address counter 8
Clear and repeat the above operation. FIG. 5 shows an example of the transmission information frame structure.

Through the above operations, a transmission information frame as shown in Fig. 5 is automatically created, which has a transmission information address (word number) with the same number as the address number of each input/output device installed in this information transmission device. It is constructed and sent out on the communication line to realize the purpose of information transmission.

In this embodiment, when adding an input/output unit, simply assign an unused address number to the expansion unit, set it to the address setting switch 1 of the expansion unit, and implement the implementation code indicating the type. All you need to do is set it in the code generator 7. The same applies to changing or abolishing the input/output unit, and the program of the microprocessor CPU does not need to be changed. For units that have been added or changed, by executing the above initial processing routine,
This is because the implementation code indicating the type of the unit is automatically stored at the corresponding address in the transmission information management table IO. Furthermore, the mounting positions of the plurality of various input/output units are free, and there is no problem even if different types of input/output units are mixed and assigned address numbers in random order. That is, this embodiment has the advantage of being able to easily and flexibly deal with expansions, changes, etc.

Effects of the Invention As described above, in the present invention, each input/output unit is set with a unique address and an implementation code indicating the type of input/output unit, and in the initial operation of the information transmission device, the individual address is sequentially set. The implementation code is returned from the input/output unit of the controller and stored in the corresponding address of the transmission information management table. During the main operation, the microprocessor refers to the transmission information management table to determine each address number. It knows the implementation status and the type of its input/output unit, performs data input processing corresponding to that type, and constructs a transmission frame in which a transmission information address with the same number as the address number of the input/output unit is added to the processed data. Since the configuration is configured so that the ROM is sent to the communication line, even when adding input/output units or changing the layout due to system changes, there is no need to recreate and replace the ROM as in the past. It is only necessary to set or change the address setting of the input/output unit and the implementation code indicating its type, which has the advantage that it can be handled easily and flexibly.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of each input/output unit in an embodiment of the present invention, and FIG. 2 is a diagram showing the address counter, transmission information management table pointer, and transmission information management table of the microprocessor in the above embodiment.
FIG. 3 is a flowchart of the initial processing program of the above embodiment, FIG. 4 is a flowchart of the transmission processing program, FIG. 5 is a diagram showing the structure of the transmission information frame, and FIG.
Figures (A), (B), and (C) are diagrams showing an example of the configuration of a conventional information transmission device, the configuration of a conventional input/output unit, and a conventional transmission information table, respectively. In the figure, 1 near address setting switch, 2 near address/number configuration circuit, 3: decoder, 4, 5: gate, 7: implementation code generator, 8 near address counter, 9: transmission information management table pointer, lO: Transmission information management table.

Claims (1)

[Claims] Various input/output units that input monitoring information, measurement information, etc., and a sending unit that sends out the information input from each input/output unit to a communication line are connected to the microprocessor via a bus, and are controlled by the microprocessor. In an information transmission device that sends various types of input information onto a communication line, each input/output unit is assigned a unique address and an implementation code indicating its type, and each input/output unit is configured to transmit various types of input information onto a communication line. an address matching circuit that detects a match between an address signal and a unique address assigned to itself; and an address matching circuit that is activated by the matching output of the address matching circuit and decodes and responds to a control code input from the microprocessor. The microprocessor includes a decoder that opens the gate described later, and a gate that is connected between the output of the external data or implementation code generator and the data bus and is opened by the decoder output, and the microprocessor corresponds to the address of each input/output unit. A transmission information management table is provided for storing the implementation code of the input/output unit, and the implementation code is sequentially returned from each input/output unit using an address signal and a control code during initial operation. The implementation code returned from the unit is stored in the corresponding address of the above transmission information management table, and after moving to the main operation, the data from each mounted input/output unit is retrieved by referring to the transmission information management table. 1. An information transmission device characterized in that the information transmission device is configured to transmit a transmission information frame in which the same word number as the address of the input/output unit is added to data obtained by performing predetermined processing on the returned data.