JPS627563B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a step-by-step sequence controller. There are two types of sequence controllers: progressive type and scanning type. The step-by-step type controls in such a way that when the operation corresponding to a certain step of the control program is completed, the program is advanced by one step in response to the completion detection signal and the operation of the next step is started. It is. In the scanning type, data indicating the state of the controlled system is input to the input device of the control device, and the control device constantly scans the input device to detect the state of the controlled system and determines the state according to the state. It is now possible to carry out controlled controls. The scanning type allows virtually continuous control, but it is difficult to create a control program and the control device is complicated and expensive. Step-by-step control devices have the disadvantage that the controlled system operates in stages and can sometimes only be controlled in a clumsy manner, but programs can be easily created by anyone, and the control device is relatively inexpensive. Moreover, since there are many controlled objects for which stepwise control is actually sufficient, the sequence controller is very economical for such objects.

Conventionally, progressive sequence controllers have used pinboards and pins to create and input programs. However, with a pinboard-type sequence controller, the program is input to the sequence controller by inserting a pin into a predetermined position in a pin hole row on a pinboard for each step of the program, so the entire program created is based on the pins. Although it has the advantage of being displayed due to its placement, it is not reliable enough due to poor pin contact, requires a large number of pins, and managing them is troublesome. There are disadvantages such as a large board area. Therefore, if the program is entered into the memory of the sequence controller by key operations on the keyboard, there will be problems with pin management, poor pin contact, and if the number of steps in the program increases, the sequence controller will have to have a large pin board. The problem is eliminated and the result is superior to the pinboard version in terms of management, reliability, and cost (especially when the number of program steps is large). However, with the method of inputting programs by key operations, there is a possibility of pressing the keys in the wrong order or pressing the wrong key altogether, and such erroneous operations can disrupt the format of the commands, resulting in the input of completely meaningless commands. Therefore, it is necessary to avoid making mistakes in key operation. On the other hand, operators, especially experienced operators, do not check the result of each operation by looking at the display on the device, but rather operate the keys while looking at the sheet on which the program is written. Therefore, there is a problem in that it is difficult for people to realize that they have made a mistake in operation.

Therefore, the present invention is a step-by-step sequence controller in which a program is input by key operation, and in order to solve the above-mentioned problems, when an error occurs in the operation, the device detects the erroneous operation. To provide a sequence controller that emits a warning sound to alert an operator to an erroneous operation. The present invention will be explained below with reference to Examples.

FIG. 1 is a front view of an operation panel of a sequence controller according to an embodiment of the present invention. The group of keys 1 in the lower right corner of the panel are input keys for commands, data, etc. The keys with numbers written on them are used for both inputting commands and data numbers, and the keys with Roman letters written on them are for operation. This is the key. The two upper and lower display sections 2 and 3 on the upper left are rows of output terminal display lamps, numbered 32 from number 1 to number 32.The lamp at the position indicating the output terminal specified in a certain program step will light up. ing. The two-stage display section 4, 4' on the upper right is a row of input terminal display lamps.
There are numbers from No. 32 to No. 32, and when an input is applied to the input terminal specified in a certain program step, the corresponding lamp lights up. The number display section 5 below the display section 3 is divided into four frames 51, 52, 53, and 54. The leftmost frame 51 displays a two-digit step number, and the right frame 52 displays the step number. represents the type of instruction as a one-digit number, and the number 4 in the example shown in the figure means, for example, an AND instruction. A bilingual table of the command word and its code number is written in the frame 6 below the number section 5. The third frame from the left and the rightmost frame 53, 54 in the number display section 5 are two-digit numbers each representing a numerical value of data.

Next, we will outline the operation method for the above panel. Program writing. First, power switch PS
Turn the program console switch CS to the on side, then turn the step to “0”.
To do this, flip switch S2 to the reset side. Also, it is assumed here that all memory for storing programs has been cleared. Then, input each step of the program in sequence. Each step of the program starts with a key in the key group at the beginning of writing.
Press the INS key and then the command key. Since the command for each step is always one word, pressing the numeric key after the INS key automatically becomes a command input operation, and subsequent key operations automatically become data input. Therefore, the same key can function either for command input or for data entry, depending on the order in which it is pressed during a write operation. First, write the instruction for the 0th step.
Press the INS key, then press the number 2 key.
The number 2 key is a return command, that is, a command to return to the starting point, and the first frame 51 from the left of the number display is "00", the second
The frame 52 becomes "2" and the 0th step is completed, and then the R/W key is pressed. This is a key for commanding reading and writing to the memory.A return command is written in the memory, and by pressing the R/W key, the step is automatically advanced and the first frame 51 of the numeric display section is displayed. will be “01” and all other frames will be 0. Now input the command for the first step. For example, if this step is to output output to output terminals 2 and 4 by ANDing the inputs of input terminals 1 and 3, first press the INS key and press the number key 4, which indicates the AND command. 4 is displayed in the frame 51 of the number display section. Since a command is limited to one word, the next key pressed naturally becomes a data input operation. In this case, the command is to AND the inputs from input terminals 1 and 3, so press the number keys "0" and then "1". The display in the frame 53 of the number display section becomes 01, then press the number key "0" and then press "4", the display in the frame 54 of the number display section becomes 04, and the number display section is set to The contents of the step are displayed as “and”, “01”, and “04”. Next, press the OUT key to specify the output terminal, and the display 3
The number 1 lamp flashes. Next, when you press the OFF key, the lamp above the number 1 on the display section 3 disappears and the lamp above the number 2 blinks. Next, press the ON key, the lamp above the number 2 will light up, and the output terminal 2 will turn on.
The content of the command to be output is displayed, and the lamp above the next number 3 starts blinking. Output is made to terminals 2 and 4, so press the OFF key again. Then, by pressing the OFF key, the lamp above the number on the display section 3 goes out, and by pressing the ON key, the fourth output terminal is designated. Now that the configuration of the first step command is complete, press the R/W key to write the first step command in the memory and advance the program step one step. “02”
Display. Thereafter, the program contents are input into the memory step by step by the operations described above. Thus, if the last step is to run the entire program 15 times, press the keys in the following order: "INS"
"8" (code number of repeat command) "1", "5"
(Meaning 15 times) "0""1" (Meaning from step 1 of the program, that is, repeating from step 1 to this step 15 times.) Press "R/W". The formal end of the program is the ``END'' command, and in the next step after the above-mentioned repeat command, the entire program is completed by key operations in the order of ``INS'', ``END'', and ``R/W''.

Next, to run the above program, turn the program console switch CS to the OFF side, turn the switch S1 to the "auto" side, and turn the start switch S3 downward once. The program will now start running. While the program is being executed, the indicator light 55 to the right of the number display section 5 is lit. Each frame of the numerical display section 5 numerically displays the program step number currently being executed, program contents, etc. For example, when the first step is being executed, the number 01 appears in the first frame 51 of the number display section 5, indicating that it is the first step, and the command for this step is executed.
When it is AND, the second frame 52 shows the number 04, and the two input terminals for which the AND condition should be satisfied are 1.
and number 3, the third frame 53 of the number display section shows
The number 01 appears, and the number 03 appears in the fourth frame 54. In this first step, when an output is output to the designated output terminals 2 and 4, the lamps 2 and 4 of the display section 2 are lit. The first step is input terminal 1
When an input signal is input to both 3 and 3, the program progresses by one step, and the display of the numeric display section changes to the content display of the second step, and at the same time, execution of the second step is started. That is, as the program progresses, when the command contents of a certain step, that is, the setting conditions are satisfied, the step is incremented and the next step is executed.

FIG. 2 is a block diagram showing the internal structure of the above-mentioned device. The block marked CPU is the central control unit in this device, which is a microcomputer, and M is the memory for storing the program to be executed by this sequence control device, and the program is stored by the above-mentioned program write operation. Assume that a certain step in a program is currently being executed and the output specified by that step is being output. At that time, the CPU reads out the instructions of the above steps from the memory M and stores them in the accumulator in the CPU.On the other hand, it constantly scans the input terminals IN1 to INn to check their input states, and records this input state and the accumulator. The CPU's built-in arithmetic judgment circuit compares the input terminal number and conditions in the instruction for that step stored in the mulrator, and if they match, 1 is added to the number of addresses specified in memory M, and the next step is read out. Perform the same operation as above. That is, this device uses a step-by-step type of external load control, but internally performs a scanning-type sequence control.
However, this scanning sequence control is constant as described above, regardless of the operations to be executed externally, and this internal control program is executed by the CPU.
It is stored in read-only memory (ROM) inside the computer. When writing a program to control an external load, the CPU reads an internal control program for program writing from the ROM, and according to the program, the aforementioned panel keys 1, console switch CS, switch S2, etc. are connected. Repeatedly scans the input state of the internal input circuit. To be exact
The CPU controls the console switch connected to each input terminal IN1 to INn of the external input circuit IN and the internal input terminal according to the internal control program written in the ROM.
It scans the open/closed status of CS, switch S2, etc., key group 1, etc., and identifies program writing, program execution, or other operations based on the input status of the internal input circuit. The following actions are now being performed. In this case, the input state of the internal input circuit is program writing, so as mentioned above, only key group 1 and the internal input circuit are scanned, and the commands set by the key group are sequentially written to memory M. Go.
Furthermore, during program writing, execution, and other operations, the CPU displays the contents of the steps of the program being written, the contents of the steps of the program being executed, the contents of specified steps in the program, etc. on the numerical display section 5 and the display section. The action to display on 2nd and 3rd etc.
Executes according to internal control program in ROM.

In short, the CPU is operated by an internal control program written in the ROM that controls the CPU itself, and the internal control program that controls the CPU is switched depending on the input state of the internal input circuit. The target operation switches to writing the external load control program, executing the program, etc. Further, a random access memory M is used as a step counter for incrementing steps in the execution of an external control program.

Now that the general description of the normal program writing operation and the operation of the apparatus of the present invention during program execution has been completed, the following will explain the erroneous operation during program writing and the corresponding operation of the apparatus at that time. An example of an erroneous operation in the program writing operation is when writing one program step is completed by pressing the R/W key.
The display indicates the next step number. Writing the next step command begins by pressing the INS key, so generally after pressing the R/W key,
You should press the INS key, and if you want to check the command of the previous step that has already been written, or if you want to skip the program several steps and write to the next step, press the SET STEP key. Therefore, it is wrong to press the numeric key immediately after pressing the R/W key. Also, when you press the INS key, you are writing a command, so the command key is used.In this example, the command key is used in conjunction with the numeric keys, so you need to use keys other than the numeric keys, such as the SET STEP key or the OUT key ( It is an error to press ) to specify an output key in a command.

When an erroneous operation as described above is performed, the device detects the erroneous operation and issues a warning with a buzzer or the like to urge the operator's attention. Further, the result of the erroneous operation is not input to the memory at all, and the write operation remains in the state before the erroneous operation. Therefore, the operator only has to look at the displays on the displays 2, 3, and 5 and perform the correct operation to continue with the content represented by the displays. For example, when you press the INS key and then press the OUT key when you should press a number key, a buzzer will sound, so you can immediately press the desired number key again.

Misoperations can occur not only during program writing operations, but also when retracing the steps of a written program and displaying it to check the program. In this case, press the SET STEP key mentioned above, but when you press this key, you should press a numeric key to specify the step number.
It is a mistake to press the INS key or the R/W key. Even in such a case, the device emits a warning sound, and the device remains in the state before the erroneous operation without receiving the consequences of the erroneous operation.

FIG. 3 is a flowchart of the above-mentioned operation in the apparatus of the present invention, and a program for realizing this operation is preset in the ROM shown in FIG. 2. The CPU repeatedly scans the open/close status of switches such as console switch CS, the status of key group 1, etc., and determines whether the console switch CS is on or off. If it is on, it means writing a program or checking a program, so next Asks if the SET STEP key was pressed; if NO, asks if the INS key was pressed;
If NO, ask if the OUT key was pressed and set
If the STEP key was pressed, the next numeric key was pressed.If NO, it was an error and the buzzer sounds.If the SET STEP key was not pressed and the INS key was pressed, the next command key was pressed. A question is asked as to whether or not a key (in the embodiment, a numeric key) has been pressed, and if NO, it is an incorrect operation and a buzzer sounds. Similarly, if the OUT key is pressed and then the ON key or OFF key is not pressed, the buzzer will sound because it is an incorrect operation. In the explanation of the flowchart above, the question "Whether a numeric key was pressed" was written that way for convenience; in reality, at this stage, the question is whether or not a key other than the numeric key was pressed, and is simply It doesn't just sound a buzzer when a number key is not pressed. Otherwise
Since scanning by the CPU is performed at high speed, for example, there is a certain amount of blank time between pressing the INS key and pressing the next numeric key (command key), so the buzzer will sound during that blank time. It becomes very noisy. Therefore, the details of the flowchart are illustrated in FIG. 4, with the line after the question asking whether the SET STEP key has been pressed as a representative example. That is,
If YES to the question of whether the SET STEP key was pressed, it will ask whether a key other than the numeric key was pressed, and if YES to this question, it will sound a buzzer, if NO, it will ask if a numeric key was pressed, and if NO, it will press the numeric key. The operation of returning to the step of asking whether a key other than the key has been pressed is repeated until a numeric key is pressed.

In Fig. 2, when it is determined that the buzzer should sound due to the above operation, the CPU sends the buzzer.
A drive signal is output to BZ, and the display on memory M and display sections 2, 3, and 5 remains the same as before the erroneous operation.

The device of the present invention has the above-mentioned configuration, and when an erroneous operation is performed, a warning sound is emitted, so that the operator does not have to look closely at the device panel (in fact, an experienced operator may not look at the device panel and only program the program). (You operate the keys while looking at the sheet you have written on), and since any erroneous operation is transmitted to your auditory senses, you can definitely notice the erroneous operation and immediately redo the correct operation, making operations such as writing and checking programs more efficient. It will be done.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of the device, FIG. 2 is a block diagram showing the internal configuration, and FIG.
The figure is a flowchart of the main part of the operation of the device, and FIG. 4 is a detailed flowchart of a part of the same flowchart. 1... Keys of the key group, 2, 3, 5... Display section,
CPU...Central control unit, M...Memory for writing sequence control programs.

Claims (1)

[Claims] 1. A process number specification key that indicates the start of specifying the process number, a command key that indicates the step condition, a data specification key that specifies the element to be calculated for the step condition, and an output setting start key that indicates the start of the output setting ( OUT),
A pair of buttons for setting ON/OFF of each output.
ON/OFF key, write key to write the command created by operating each key above to memory, process number display that shows the process number, adjacent to this process number display to indicate the step condition with a mark. a data display adjacent to the command display to indicate the number of the element to be calculated, a plurality of indicator lights arranged in parallel to individually display all outputs; A key that determines whether or not the operation of each key from the process number designation key to the above-mentioned write key is appropriate with respect to the format of the instruction for one process, and if it is inappropriate, activates the alarm generating device and prohibits writing to the memory. The operation monitoring means, in accordance with the command read from the memory, increments the process when it is detected that the increment condition is met for the element to be operated on, and outputs all the outputs specified in the incremented process. A step-by-step sequence controller with an arithmetic processing unit that outputs ON/OFF signals.