JPS58107906A - Process step type programmable controller - Google Patents

Abstract

PURPOSE:To confirm the steps of a plurality of process step type programs under execution at present, by displaying execution steps on a display used for other displays such as steps and instruction data normally in common. CONSTITUTION:In the monitor operation, first the initial processing such as reset of a work area RAM5 is performed. Further, an input is read via an input interface 9, the corresponding output is determined and the input and output are stored in an I/O refresh memory RAM4. Then, the user's program is executed. When a ladder expression program reaches its end, a counter provided in a work area RAM5 is zeroed. Further, the work area RAM5 is provided with an area picking up and storing the steps and the instructions stored in the storage area.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a step-by-step programmable controller that automatically controls machine tools and the like.

In general, in addition to so-called ladder representation programs, programmable controllers have step-by-step programs that execute an operation related to only one step among many steps and do not proceed to the next step unless the condition for that step is satisfied. .

Moreover, it is equipped with multiple step-by-step programs.

There are programs that operate these programs in parallel to control a plurality of controlled devices. On the other hand, there are cases where it is desired to monitor the step currently being executed during processing in the programmable controller.

However, conventional step-by-step programmable controllers can only display the steps of one unit during parallel operation, and if the control system stops for some reason, it is difficult to determine which program has caused the abnormality.

- It had the disadvantage that it was difficult to distinguish by looking at it.

An object of the present invention is to eliminate the drawbacks of the conventional step-by-step programmable controller described above, and to provide a step-by-step programmable controller that allows checking of the steps currently being executed in a number of step-by-step programmable programs. It is in.

In order to achieve the above object, the programmable controller of the present invention is provided with a monitor mode input means for parallel display in the program console section, and by specifying the monitor mode, the execution steps of a plurality of step-by-step programs are displayed in the program console section. The display, which is normally used for displaying steps, command data, etc., can be switched to display the same information.

The present invention will be explained in detail below with reference to embodiments shown in the drawings.

FIG. 1 is a block diagram of a programmable controller in which the present invention is implemented. In the figure, reference numeral 1 denotes a CPU (central processing unit) that proceeds with the processing operations of the system according to a system program stored in a system program storage ROM 2. The system program ROM 2 stores an interpreter program for decoding and executing user programs, and programs for controlling the keyboard, LEDs, and the like. Reference numeral 5 denotes a user program RAM that stores programs created by the user using user commands such as AND, OR, and Ou. 4゛
- This user program RAM is a program storage area 711 in a ladder representation as shown in FIG. and a plurality of step-by-step program storage areas mQ, ml, m2i. 4 is a refresh memory that temporarily receives and stores the status of the input/output device, which will be described later; 5 is a work area RAM used for temporary recording of flag status and data; 6 is the input/output device and C
This is an input/output control unit that connects with PU1.

7 is a professional used when creating a user program,
Durham console section, a group of keys such as command key 7a, number key 7b, command key 7c, input/output display LE
D7d, command word display LED 7e, error display 7f, numeric display 7g for displaying addresses and data, etc. on the panel surface 7.
Equipped with hvc. 8 is CPU1. System program ROM2. User program RAM 3, 10 refresh memory RA
M4, RAM5 for work area. This is a path line that connects the input/output control section 6, the program console section 7, etc. 9 is an input interface for exchanging signals with external input; 10 is an output interface for exchanging output signals with external equipment; and 11 is a path line for connecting the input/output control section 6, the input interface 9, and the output interface 10. Further, 12 is a terminal block for receiving signals from external inputs, such as various switches, and 13 is a terminal block for connecting to external equipment.

In the above embodiment, assuming that the six step-by-step programs mOr m 1 r m 2 shown in FIG. 6 are running, an example of the steps being executed is shown in FIG. 2. Figure 2 (4) shows the case where one of the five step-by-step programs is specified and displayed, and one display 7
Program number 1 and step number 25 are displayed on gl, and command data for that step is displayed on display 7g2. Figure 2 CB) is an example of a display when six step-by-step programs are displayed in parallel, and 1 display 7gl shows a rorororo display (indicates a parallel display, 2 digits each from the left of 1 display 7g2). The display of 12.04 and 92 is 1 respectively.
White of eyes.

The steps being executed on the second and third machines are displayed. In this way, each step in the parallel display is displayed using the same display that normally displays command data and the like.

The display of the execution steps of one step-by-step program, that is, the normal display, and the display of the execution steps of a plurality of step-by-step programs, that is, the parallel display, can be selected by selecting the operation keys of the program console section 7. This is done by As shown in FIG. 6, in the case of a normal monitor, following the operation of the "s" and "cONJ" keys among the command keys 7a group, the numeric key 7b (for example, [ ]) for specifying program 5 is pressed.

key) is pressed, 1 of the command keys 7C group is pressed.
When the key is pressed, the program, step number, and data are displayed. In case of parallel display, "5-
Following the operation of the CONI key, a numeric key is pressed, and the "monitor" key is pressed.

Next, the monitor operation in the embodiment shown in FIG. 1 will be explained with reference to the key interrupt control flow shown in FIG. 4 and the monitor operation control flow shown in FIG.

If any key is operated during the operation shown in FIG. 5, the key interrupt process shown in FIG. 4 is executed. When a key is operated, the key operated in step 40 is first
-CONJ key is determined.

If the [S, C0NJ key is pressed, the determination is YES and the process moves to step 41, where the p, S, CON instruction code and parallel display flag are set, and the process returns. Next, if the "Monitor" key is pressed, step 40 "[5-CONJ"
If the key is NO, the process goes to step 42, and the process goes to step 42.9.
When the wrong number key designated for program E is pressed following the operation of the S, C0NJ keys, "5" at step 40 is pressed.
-CONJ key?" judgment NO, step 42 ""
The operation flow is step 4 when the judgment No is "Monitor" key or "".
The program moves to step 4, where it is determined whether it is a ``numeric key''.In this case, if the determination is YES, the program moves to step 45, where the data section designation number, that is, program 5 is set, and the parallel display flag is turned off. key, "monitor" key,
If the key operation is not one of the "numeric" keys, the determination in steps 40, 42, and 44 will be No.
The program then moves on to other key processing routines.

The monitor operation is performed in step 50 as shown in FIG.
After performing initial processing such as resetting the work area RAM 5i, the input interface 9 is reset in step 51.
The inputs are read through the CPU 10, all corresponding outputs are determined, and the inputs and outputs are stored in the 1/2 fresh memory RAM4. Then, in step 52, the user program shown in FIG. 6 is executed. That is, program execution starts from the first address a of the ladder representation program. Then, in step 53, it is determined whether it is a °°bladder end, and steps 51, 52, and 53k are repeated until the ladder expression program ends.When the ladder expression program reaches the end point (address b in Fig. 6), step 53 The determination is YES, and the process moves to step 54, where the counter Ci provided in the work area RAM 5 is set to 0.The work area RAM 5 has a storage area mO+ shown in FIG. 6, as shown in FIG.
m 1 * An area for extracting and storing the currently executed step and its instructions of the step-by-step program (1), step-by-step program (2), and step-by-step program (3) respectively stored in m2. NMO, NMI, N
It has M2. Counter Ci is this storage area NMO
, NMI, and NM2 to store a numerical value i that specifies NM2.

In step 55 following step 54VC, instruction data is read from the work RAM, that is, the storage area NMQ, corresponding to i=Q, and in step 56, it is determined whether "the condition is satisfied". The judgment in this step is N.

In this case, that is, if the condition is not satisfied, the output data is written/rewritten in the refresh memory 4 in step 57, and the process moves to step 59. If the judgment at step 56 is YES because the condition is satisfied, the process moves to Nut 158 and the storage area N
The current step of the MO is incremented by +1, and the instruction corresponding to that step is updated and stored in the storage area NM[ ] of the work area RAM 4 from the user program RAM 3. Note that in step 58, the current step is not limited to +1, but there are also cases where the process jumps to a predetermined jump destination. In this case, the jump destination step will be stored as the current step. Following step 57 or step 58, in step 59 the content i of counter Ci is +
1 and set as a new i. Since i = [] at the beginning, i = 1 in this star. Then, in step 60, it is determined whether i=3 or '', and if the determination is No, the operation flow returns to step 55.Then, data is read from the work area RAM 5, that is, the storage area NMI corresponding to i=1, and then in step 56. It is determined whether the condition is satisfied.The processing operations of steps 56, 57, 58, and 59 proceed in the same manner as in the case of the storage area NMO.Then, in step 59, i-2 is set this time.Step 60
Since the determination of ``°°i=3'' is No, the process returns to step 55, and this time the storage area N is stored for the area NM2.
The same processing as in the case of MO and NM1 is performed. However, since i=3 in step 59, the determination in step 60 becomes YES and the process moves to step 61. In other words, regardless of whether or not the condition is satisfied for each step-by-step program, the processing at the current step has completed one cycle.

In step 61, the contents of the station refresh memory 4 are transferred to the output device via the output interface 10. Then, the process moves to operation processing from step 62 onwards.

In step 62, it is determined whether the ``monitor flag is on''. As mentioned in the explanation of FIG. 4, if there is a key interruption due to the ``monitor'' key operation, the monitor flag is turned on in step 45. Therefore, proceed to step 66.
, determines whether "5-CON is a monitor". If the l-8-CONJ key has not been previously pressed, the flow moves to step 64 if the determination is No, and another relay status is set in the relay status LED. Step 6, previously 18
- If the CONJ key is pressed and the determination 9 is YES, the process moves to step 65, where it is determined whether the 9'' parallel display flag is on. If the keys are operated in the order of l-8, C0NJ key, and "monitor" key, the parallel flag is set in step 41 of the key interrupt processing flow shown in FIG.
In this case, if the determination is YES, the process moves to step 66, where processing for parallel display is performed. That is, a RORORORO signal is set in the step section, and the current step & o of each process step-by-step program is set in the data section.

At the time of determination in step 65, if the parallel display flag is not on, that is, the "5-CON" key, the "number" key,
If the keys are operated in the order of the "monitor" key and the parallel display flag is turned off in step 45 of the key interrupt processing flow shown in FIG.

If the determination is No, the process moves to step 67, where the normal display, that is, the process of displaying the specified input program information is performed. That is, the program designation and instructions are set in the step section, and the currently executed instruction is set in the data section and instruction LED. Following steps 64 and 66 or 67, the process moves to step 68 and transfers each set display data to the display LSI provided in the program console/l/7. The contents are displayed on the number display 7g, the music command display LED 7e, etc.

The display following step 67 is, for example, as shown in the lower left column of FIG. 6, and the display following step 66 is, for example, as shown in the lower right column of FIG. 3.

In the above embodiment, the monitor mode switching between single display and parallel display is performed by switching between the [S, C0NJ keys and the "monitor" key, but a separate monitor key for parallel display may be provided.

As described above, according to the step-by-step programmable controller of the present invention, the execution steps of a plurality of step-by-step programs can be displayed in the parallel display monitor mode using a display provided in the program console and usually used for other displays. Even in the case of parallel operation, each execution step of each step-by-step program can be confirmed, which is very convenient for the user in terms of maintenance. Moreover, this parallel display function can be realized at low cost without requiring much hardware effort.

[Brief explanation of the drawing]

Fig. 1 is a system block diagram of a programmable controller in which the present invention is implemented, Fig. 2 is a diagram showing a display example in the embodiment system shown in Fig. 1, and Fig. 6 is a key operation procedure and each key operation in the case of monitor processing. FIG. 4 is a diagram showing the key interrupt control flow in the embodiment system shown in FIG. 1, FIG. 5 is a diagram showing the monitor operation control flow of the embodiment system in FIG. 7 is a diagram showing the arrangement of user programs, and FIG. 7 is a diagram showing the arrangement of a part of the storage area of the work area RAM. 1: CPU, 2 system program ROM,
3=RAM for user program. 4: RAM for refresh memory. 5: RAM for work area, 6: Input/output controller, 7: Program console section. 7a: Command key, 7b: Numeric key. 7C: Command key, 7d: Input/output display LED. 7e: Command display LED, 7g: Numerical display. 8: Bus, 9: Input interface. 10: Output interface, ii: I10 path. 12: Input terminal block, 13: Output terminal block. Patent Applicant Tateishi Electric Co., Ltd. Agent Patent Attorney Shigeru Nakamura (15) 25- Shu 6 Zushima 7y 2t

Claims (1)

[Claims] (1) Program console/”fjV) (!:
+ A system program storage unit, a user program storage unit that stores a plurality of step-by-step programs in addition to the ladder representation program, and a central unit that executes the user program and controls the controlled device according to the system program. Equipped with processing equipment. In a step-by-step programmable controller capable of controlling a plurality of controlled devices by running the plurality of step-by-step programs in parallel. The program console section is provided with a monitor mode input means for parallel display, and in the parallel display monitor mode, the execution steps of the plurality of step-by-step programs are input to the program console section, which is normally used for other displays. A step-by-step programmable controller that doubles as a display.