JPS5856121B2 - sequence programmer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sequence programmer using a stored program method.

The basic format of sequence programmers using the stored program method is roughly divided into the following two types.

One method is to organically combine relay contacts, relay elements, etc. to create a sequence circuit diagram, divide the circuit diagram into multiple blocks, and determine the connection relationships between the contacts in each block and the relays, etc. By storing the operation code and the numbers of the contacts, relays, etc. as commands in a storage unit, scanning and reading the contents of this storage unit at high speed with a program counter, and repeatedly executing the read commands at high speed. Control is performed according to the desired sequence circuit diagram.

The other is a process that divides the content of the sequence to be realized into multiple control steps, or processes, and expresses the output control content to be executed in each process and the conditions for transitioning from one process to the next process. Each update command is stored as a program for one process at a predetermined address in the storage unit, and the contents of the address specified by the program counter are read out and the output is controlled according to the contents. The sequence is executed by monitoring whether the conditions (operating status of external control equipment such as limit switches, time signals from timers, etc.) are in place, and when these are in place, the program counter is incremented and the process moves to the next process. It is executed sequentially.

The former method requires the creation of a sequence circuit diagram when programming, and is suitable for those skilled in conventional circuit technology, but is difficult to use for those without knowledge of the above circuit technology. It is.

The latter method is called a step-by-step method and is the subject of this invention.

This step-by-step stored program type sequence programmer does not require any knowledge of the above-mentioned circuit technology; once the specifications for the control target are determined, a flowchart is created that divides the control specifications into each process, and the program is run according to that flowchart. All you have to do is write it down.

Therefore, once the key operation procedure for writing a program is understood, it becomes very easy to use even for ordinary people without special knowledge.

This invention takes advantage of the feature that the program method of the step-by-step type described above is easy to understand, and allows checking of the program stored in the storage unit and the operating state during use to be performed sequentially for each process. This provides an extremely practical sequence programmer that allows for

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 shows the appearance of a sequence programmer according to the present invention, and FIG. 2 is a block diagram showing the outline of its configuration.

As shown in FIG. 2, the device main body 1 shown in FIG. An input unit 4 and an output unit 5 as an output interface are built-in, and the input unit 4 is connected to multiple input devices 6 such as limit switches and photoelectric switches related to controlled equipment, and the output unit 5 is connected to the input unit 4. A plurality of output devices 7 such as relays related to devices to be controlled are connected to the device.

In addition, the front panel of the device body 1 includes a power switch,
Various switches are provided to change the operating mode of automatic operation, manual operation, program writing, and program monitoring, and an operation section 9 including a keyboard 8 used for program writing and monitoring is provided, as well as for program writing and monitoring. A process number display 10 and a command display 11 are used to display the program contents for one process (step) when the program is executed.
and an output display 12 (display section 50 in FIG.
Furthermore, an instruction code comparison table 13 is provided which abbreviates the meanings (control details) represented by the symbols displayed on the instruction display 10 or the symbols on the keyboard.

In this sequence programmer, a program for realizing a desired sequence is set for each process and stored at a predetermined address in the storage section 3.
The program for a process basically consists of output control contents and process update commands.

The output control content is how the output is controlled during the execution period of the process, that is, the setting content of whether each of the 16 output devices 7 in the embodiment is turned on or turned off.

Further, the process update command includes a command indicating what state should be reached before proceeding to the next process, a jump command, a repeat command, an end command, and the like.

Now, in this apparatus, out of a series of programs stored in the storage section 3, a program for one step is sent to the arithmetic control section 3.
When the process number display 10 and command display 1 are read and executed, the process number display 10 and the command display 1 are displayed by the display control operation of the arithmetic control unit 2.
1 and output display 12 display the program contents of the process being executed.

In other words, the process number display 12rsTEPJ consisting of a 2-digit, 7-segment numerical display displays the process number sequentially given to each process constituting a series of sequences (also the storage address of the program for each process in the storage unit 3). (equivalent) is displayed, and in the above case, the number of the process currently being executed is displayed.

Note that, except for jump commands and repeat commands, the programs for each step are sequentially stepped and executed in the order of their step numbers.

Further, the output display 12 displays the above-mentioned output control contents of the program for one step being executed.

That is, the output display 12 consists of 16 display lamps, each corresponding to 16 outputs, and the control settings for each output are displayed in binary by blinking these lamps.

While the program is being executed, the display on the output display 12 represents the driving state of each output device 7.

The command display 11 includes an operation code display section "OP" consisting of a 1-digit 7-segment display, and an operation data display section "rDATA-1" and "rDATA-2" each consisting of a 2-digit 7-segment display.
The contents of the process update command are displayed using predetermined symbols.

The specific contents of the main process update commands will be explained by comparing the displayed symbols on the command display 11 with the above command code comparison table.

The display “4” on the display section rOPj above indicates AND
This is an input condition AND step instruction that advances to the next step when a logical product condition of input signals at two specified addresses (input terminal numbers) is satisfied.

In the case of this AND command, the displays in the display sections "DATA-1" and "DATA-2J" each represent the addresses of two input signal sources (ie, input device 6) to be ANDed.

Furthermore, the display "5" on the display section "OP" is an OR instruction, that is, an input condition OR step instruction that advances to the next step when the logical sum condition of input signals at two specified addresses is satisfied. .

In the case of this OR instruction, the display section “DATA-IJ and r
The indications in "DATA-2" respectively represent the addresses of two input signal sources to be ANDed.

In addition, the display “6” on the display section rOPJ means CNT
This is a counter increment instruction that counts a set number of pulse signals from an input signal source at a specified address and advances to the next step.

In the case of this CNT instruction, the display on the display section rDATA-2j represents the address of the input signal source to be counted, and the display on the display section rDATA-IJ represents the set number.

Further, the display "9" on the display section rOPJ is a TIM command, that is, a timer increment command to count a set time specified by an internal timer and advance to the next process.

In the case of this TIM command, the display on the display rDATA-IJ represents the set time in minutes, and the display on the display rDATA-2J represents the set time in seconds.

In addition, the display “3” on the display section rOPJ indicates that the JMP
This is an unconditional jump instruction that unconditionally jumps to a specified process.

In the case of this JMP command, the display section "DATA-IJ" indicates the jump destination process number, and the display section "DATA-IJ" indicates the jump destination process number.
Nothing is displayed on TA-2J.

In addition, the display "7" on the display section "OP" indicates CJP
This is an input condition jump instruction that jumps to an arbitrary process only when there is an input signal at a specified address, and otherwise advances to the next process.

In the case of this CJP command, the display on the display section "DATA-1" indicates the jump destination process number, and the display section rDA
The display on the TA-24 represents the address of the input signal source to be checked.

In addition, the display “8” on the display unit 10PJ is the RPT
This is a repeated jump instruction that repeats a jump to a specified process a specified number of times, and when the repetition is completed for that number of times, advances to the next process.

In the case of this RPT command, the display on the display unit 11) ATA-1j shows the number of repetitions, and the display unit ``DATA
-2" indicates the jump destination process number.

In addition, there are NOP instructions that do nothing and waste one process, END instructions that are inserted at the end of a program, and two-word instructions that indicate a complicated operation mode.

In addition, in the case of the above-mentioned AND instruction, OR instruction, CNT instruction, and TIM instruction, the above-mentioned output control contents are set together with the instruction, and when the instruction is executed, the output is controlled according to the setting contents as described above. In the case of other instructions, the instruction execution time is virtually nil, and therefore there is no need to set the output control content.

As described above, process update commands including various jump commands and the like are classified into an operation mode representing the type of operation and operation data specifying the contents thereof.

When the program is executed by the arithmetic control unit 2, the operation mode of the process update command being executed is displayed on the display section "OP" of the instruction display 11, and the operation data is displayed on the display sections rDATA-IJ and rDATA-2.
” are each displayed with a predetermined symbol.

The contents of this display can be understood very easily by referring to the illustrated instruction code comparison table 13.

Furthermore, in this apparatus, the program stored in the storage section 3 can be arbitrarily monitored one step at a time.

The operation and operation of the program monitor will be explained with reference to FIG.

With the switch S1 of the operation unit 9 set to MANUJ and the switch S2 set to output prohibition rOUT-INHj, each time the rSTEPJ key of the keyboard 8 is pressed, the program is sequentially loaded from the storage unit 3 to the calculation control unit 2. The data will be imported and executed sequentially, but since the output is prohibited, no actual control will be performed on the controlled object.

However, at this time, the program for one step taken into the arithmetic control section 2 is displayed on the display section 50 as in the case during execution as described above.
That is, it is supplied to the process number display 10, command display 11, and output display 12, and its contents are displayed.

Furthermore, in this apparatus, the contents of the program for one step being set are displayed on the step number display 10, the command display 11, and the output display 12 during a program writing operation.

Specifically, the operation unit 9 is set to program writing mode, the keyboard 8 is operated, and the process number, process update command, and output control content are set in this order.

First, when the rSET-8TEPJ key is pressed and an arbitrary number is input using the numeric keys, the input number, for example "06", is displayed on the process number display 10.

Next, press the rINSJ key and, for example, press the AND-4J key to display the above AN
"4" corresponding to the D command is displayed, and then if you input "05" by operating the numeric keys, the display section rDA
"05" is displayed on the TA-IJ, and then if you input, for example, "12" using the numeric keys, the display section "DATA
-2J displays "12".

Now, as a process update command corresponding to the 6th process, an
The D instruction is temporarily stored in an appropriate register of the arithmetic control unit 2.

Next, the output control content to be executed in this sixth step is set.

To do so, first press the rOUTJ key, and input whether to turn on or off outputs 1 to 16 in order from number 1 by operating the rONJ and rOFFJ keys.

Then, the setting contents are displayed by blinking each lamp on the output display 12.

Finally, press the rR/WJ key to display command display 1.
Process update instructions and output display 12 displayed in 1
The output control content displayed in is written to the address corresponding to the sixth step in the storage section 3.

Note that the data transfer control and display control for program display described above are processed by software by the arithmetic control section 2.

As explained in detail above, the present invention provides a step-by-step stored program type sequence programmer that includes: (i) a process number display that displays the number of the process; An output display that displays binary values for each output, and an instruction display that displays the contents of the process update command using predetermined symbols are provided. The present invention is characterized in that it is provided with a display control means for displaying the program of an arbitrary process on each of the above-mentioned displays when monitoring the program, and displaying the program of the process currently being set when setting the program.

By the way, with step-by-step type equipment, a series of programs that realize a desired sequence are set for each process that divides the control operation into stages, and the sequence is expressed by the connection of each process, making programming very easy to understand. Although described above as simple, this step-by-step feature is embodied in a highly significant manner by the present invention.

In other words, in the sequence programmer of the present invention, the program for each process that makes up a series of sequences is displayed for each process, and the control contents of that process can be easily understood by looking at the display. It becomes easy to grasp the status and progress state, and it is also possible to discover errors in the program and to correct them easily and accurately when setting the program or monitoring the program.

Therefore, the versatility and practicality, which are important requirements for a sequence programmer, are greatly improved compared to the conventional system, and the device becomes extremely easy to use.

[Brief explanation of the drawing]

FIG. 1 shows the external appearance of a sequence programmer according to the present invention, and FIG. 2 is a block diagram showing the outline of its electrical configuration. 2... Arithmetic control unit, 3... Storage unit, 1
0...Process number display, 11...Command display, 12...Output display.

Claims (1)

[Claims] 1 Output control details of each process that should be executed in each process,
a storage unit for storing a program for each process including a process update command representing conditions etc. for transitioning from one process to the next process; a program writing means for writing the program into the storage unit; A sequence programmer comprising an arithmetic control unit that loads a program for one process from the storage unit, controls output according to the content, and controls transition to the next process, and relates to a program for one process, A process number display that displays the number of the process, an output display that displays the output control content in binary for each output, and a command display that displays the content of the process update command with a predetermined symbol. Display control means for displaying the program of the process being executed when the program is executed by the arithmetic control unit, the program of an arbitrary process when monitoring the program, and the program of the process currently being set when setting the program, on each of the displays. A sequence programmer characterized by providing.