JPS5941008A - Sequence control circuit - Google Patents

Abstract

PURPOSE:To form and change a program easily and to execute high speed processing with simple constitution by executing processing for an input from the external by the 1st ROM and executing processing for an output to the external by the 2nd ROM. CONSTITUTION:The 1st ROM1 outputs an start address signal to a switching circuit 2 in accordance with an input signal from the external and an address latch 3 latches the output of the circuit 2 to specify the address of the 2nd ROM4. The ROM4 outputs output pattern data to an external device and the ROM1 and executes control in accordance with the contents of output pattern data. The ROM4 also applies the data of the succeeding execution address to a switching circuit 2 to execute control in executing at present by the period specified by the address execution time data and to execute a program specified by the address of the succeeding execution address data read out from the ROM4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a sequence control circuit that allows easy creation and modification of programs.

[Technical background of the invention and its problems]

Generally, sequence control circuits generate preprogrammed output signals in response to certain input signals. An example of such a device is one that uses a microcomputer to perform control using RLIMlao: written in a program in advance. However, this type of device has a complicated structure due to the arithmetic circuit, and requires a work order area in memory, so l(A
M (Random, Access, Memory) and the cost is also high.Also, if you want to change even a part of a program that has been written in a single l (UM (Read, Only, Memory)), you must write all It is necessary to change the program.Additionally, C2 is required to program this type of device.

In general, it requires systematic technology, and is there an output signal if the program goes out of control for some reason? Protective measures for external equipment provided are also required.

Furthermore, even if the programs written in the IT-ROM are executed sequentially without using a C microcomputer, almost the same problems will occur.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a sequence control circuit that is easy to create and change programs, has a simple structure, and has high reliability.

[Summary of the invention]

In other words, the present invention includes a first ROM (JM) which outputs a start address signal in response to an input signal C2, and a second ROM (JM) which outputs a program specified by this start address signal.
The second RLIM is addressed by selecting one of the next address signal included in the output signal of the second ROM and the start address signal using a circuit. Is there an [embodiment of the invention]? This will be explained in detail with reference to the following. 1 in the figure is a predetermined start signal according to the input signal given from the outside? The first output
0J R (JM). Then, this start address signal is applied to one input of the switch circuit 2, and the output of C2 is sent to the second R (JM4/
\give. Output pattern data to be provided to external equipment and the first R (JM) which are not shown in this second ROM 4.

address execution time data specifying the execution period of the control;
Writes the next control execution address and stop data that specifies control stop. The output pattern data constitutes a matrix together with the input signal input to the first RIJMI and the address latte 3, and the contents of the start address signal are controlled according to the contents thereof. Also, the address execution time data is given to the other human power of the switch circuit 2, and from the stop data 52, the switch circuit 2? 0 to control
In other words, when the program starts executing, the switch circuit 2
selects the other input, and the stop data selects the other input. With this configuration, a start address signal is provided from the 10th ROM 1 to the switch circuit 2 in response to an externally applied input signal. Then, the output of this switch circuit 2 is latched by the address latch 3, and the second
The second RL addresses the RUMd of
)M Also perform the second 80
When the data of the next execution address is given from M4 to the switch circuit 2 and the control currently being executed is executed for the period 1 specified by the address execution time data, the data of the above-mentioned 0th execution address is read. When the stop data is output from 0 or the second R (J M 4), the program specified by the address is executed, and at the end of the control currently being executed, the program waits for an input signal from the outside. OT i.e. 1st
(IJ R (J M t processes input from the outside, and the second RUM 4 processes output to the outside. Therefore, the programmed control contents are changed.

Or, when creating a new program, the first
, the contents of the second l (0M1.4) can be changed individually.
．． The contents of the second ROM 1.4 are divided into two parts for each desired control answer, and store a plurality of mutually independent programs.
Since you can select these appropriately, it is especially useful for creating programs.

It does not require advanced technology. Further C-switch circuit 2C
Since C2 always gives the data of the next execution address, the program is running.

Every time the content of the address execution time data elapses, is a new control specified by the data of the secondary execution address? In order to start (the program will not run out of control in two principles), the output data No. 11 is the first RL) and is also given to MJ, and the matrix outputs the start address signal according to this content and the contents of Hekai No. I am trying to configure it.

Therefore, it is possible to control the contents of an external input signal (two pairs of start address signals) according to the output data signal.

〔Effect of the invention〕

As detailed above, according to the present invention, programs are easy to create and change, the structure is simple, there is no risk of programs running out of control, the cost is low, and complex circuits such as arithmetic processing circuits are used. Is it faster processing compared to the f2? It is possible to provide a sequence control circuit that can perform the following steps.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention.O1...first ROM,2...switch circuit,3...
・Address latch, 4...@2 RuMn output 1 mine agent patent attorney Takehiko Suzue

Claims (1)

[Claims] A first 1 (JM) that outputs a start address signal in response to an input signal given from the outside, a switch circuit to which the start address signal is given to one input, and a switch circuit that outputs a start address signal in response to an input signal given from the switch circuit. The output cover turn data that has been read out is given to an external device and a predetermined control is applied to the period corresponding to the content of the address execution time that is simultaneously outputted by 1, and the above output cover turn data is sent to the first RtJM. The data of the next execution address corresponding to the control content to be executed is controlled by controlling the content of the start address signal, and the second R (JM) is supplied to the other input of the switch circuit. Sequence control circuit 0