JPS58159148A - Program loader - Google Patents

Abstract

PURPOSE:To reduce the generation of editing faults, by providing a program storing RAM having the same capacity as a program memor of a sequence controller in addition to a working RAM, and performing the editing after cutting off the sequence controller. CONSTITUTION:A CPU2A is controlled by a keyboard 1A, and a sequence controller (SC) connecting device 4A is started to perform transmission/reception of data to an SCB1. The program data within the SCB1 is read into an RAM5A via the device 4A and then transferred to a program editing device 6A. The editing 6A including the deletion, addition, alteration, etc. of programs is carried out with the control of the keyboard 1A. The end of editing is displayed 3A and confirmed. Then the edited data within the RAM5A is written into the SCB1 after starting the device 4A by a CPU2. Thus the stop time of the SCB1 is reduced. This prevents a fault which is due to a misoperation of a program loader.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a program loader that is connected to a sequence controller and can easily load and change programs.

Technical background of the invention and its problems Until now, program loaders that can be attached to and detached from sequence controllers and can easily read and write programs with key operations have focused on portability in handling, and have generally been small. is widely used.

Conventionally, such a program loader is called @
Due to physical constraints, the program loader's own random access memory area is limited to working memory, resulting in the following problems.

In other words, since it is only possible to start and write a program in units of one instruction or a block of several instructions, it is especially important to change the program directly while connected to the sequence controller. Since the program inside the sequence controller is rewritten, it is necessary to stop the sequence controller during the change. There was a risk that it would affect Also, some of these portable small program loaders allow editing operations such as inserting and deleting programs, but due to the lack of random access memory space inside the program loader, it is difficult to perform one editing operation. Since major program changes were made by directly rewriting the program inside the sequence controller, there was a risk of program failure due to recreational manipulation.

FIG. 1 is a diagram showing an example of the configuration of a conventional program loader. Al~Person 6 is the program loader.

Bl, B2 indicate the sequence controller, AI is one keyboard device, 2 is the control device, A3 is the display device, A4
is a sequence controller connection, 4 devices.

A5 is a program editing device, A6i is a random access memory for 1 work, B1 is a sequence controller %B2
The program memory capacity of the H sequence controller is random access memory.

Each signal al'=11 is used for the following control. Signal a, F1. This serves as a sequence controller read/write request from the keyboard device AI to the control device A2 by an external key operation.

Signal b1 is sent from control device λ2 to sequence controller connection device A4 to N4 and sequence controller B1.
It operates as a signal to control the execution of inserting/writing between.

cl serves as a signal for selecting the function of the program editing device A5 from the control device A2. The signal dl is sent from the control device λ2 to the display device 3 as a signal for displaying the current execution status of 5A. The signal el serves as a transmission interrupt signal between the sequence controller Bl and the sequence controller connection device 4. The signal f1 serves as a signal for informing the sequence controller connection device A4 of the transmission possible state from the 7-can controller B1. signal gt +hl
+kl serves as an end signal to the control device A2. The signal i1d is a data signal. The signal j1 serves as a program editing request from the keyboard device AI to the control device A2 in response to an external key operation. The signal 11 serves as a signal for controlling reading/writing of data from the random access memory B2 having a program memory capacity and the Henkens controller B1. The signal m1 serves as a signal for controlling data writing/reading from the control device A2 to the working random access memory 6.

In recent years, the development of integrated circuits has been remarkable, and the development of memory elements has also been remarkable.

For example, if we look at the capacity per random access memory, what used to be IK bits has now been integrated into 16 bits, allowing for larger capacity random access memory within the same device. It can be equipped with memory.

OBJECTS OF THE INVENTION An object of the present invention is to provide a program loader that is removable from a sequence controller and that easily reads and writes programs in the sequence controller by key operation, and includes a high-density, large-capacity random access memory. By having the entire program of the sequence controller in the program loader, and using a program editing device that uses the same memory, it is possible to edit the program with the program loader alone using hardware on the scale of a conventional program loader. To provide a program loader capable of shortening plant stoppage time due to program failure or sequence controller stoppage while the program loader is in use.

Summary of the Invention The present invention is detachable from a sequence controller, and has a keyboard section 1, a display section, and a control section.

In a program loader that reads and writes the program contents of a sequence controller by key operation, in addition to one working random access memory, there is a random access memory area for storing a program having the same capacity as the program memory of the sequence controller, and a random access memory for storing the program. This program loader is characterized in that it is equipped with a program editing device that uses an area, and that the program can be edited even when the sequence controller is separated.

Embodiment of the Invention FIG. 2 is a diagram showing an example of a configuration using a program loader according to the invention. IA ~ 7 people are program loaders,
IB indicates a sequence controller. IA is the keyboard device, 2A is the control device, 3A is the display device, 4A is the sequence controller connection device, 5 is the random access memory that is the same as the program area of the sequence controller, 6A is the program editing device, and 7A is the random access memory for work. , IB is a sequence controller.

Each signal a to n is used for the following control. Signal a is input to the keyboard [xA] by an external key operation.
This serves as a sequence controller read/write request for two control devices. This serves as a signal for controlling read/write execution between the two signal line control devices and the sequence controller connection device 4A between the sequence controller connection device 4A and the digital controller 218.

This signal serves as a signal for selecting the functions of the six program editing devices from the signal CFi control device 12A. The signal d is a signal sent from the two control devices to the display device 3AK to display the current execution status. signal ef
This signal serves as a transmission interrupt signal between the d sequence controller IB and the sequence controller connection device 4A. The signal f serves as a signal from the sequence controller IB to the sequence controller connecting device 4λK to inform that the transmission is possible. The signal g is sent from the four sequence controller connected devices to the random access memory 5.
It functions as a control signal for reading/writing data to a person. Signal program editing device 6A
This serves as a signal for controlling data reading/writing to the control device 2A. Signal IVi is a data signal.

Signals J, t and t serve as termination signals to the two controllers. The signal m is sent from the keyboard device lA to the two control devices at 7 as a program editing request by an external key operation. Signal n is control device 2
Random access memo 1J7Alc for work is used as a signal to control reading/reading of data.

An example will now be shown in which the contents of the sequence controller are changed and the changed results are written to the sequence controller again.

Methods for reading out all areas in the sequence controller to the program loader include a method of stopping the sequence controller and reading out several instructions at a time, and a method of reading out one instruction at a time without stopping the sequence controller. Here, a method of issuing instructions one by one without stopping the 7-ken controller will be described.

Seacare X without stopping the sequence controller
When the content of the 'j controller is read, the key operation causes the signal from the keyboard device IA in FIG. 2 to be sent to the control device 2λ. After the two control devices have determined whether it is a read/write operation, the four sequence controller connection devices are activated by the signal bK. Transmission methods include using interrupts and constantly checking the status. here.

Use the interrupt method. The four sequence controller connection devices send a transmission interrupt signal e to the sequence controller IB, and receive a transmission enable signal f from the sequence controller IB. Sequence controller connection device 4 people can use 7-case/sequence controller IB
After detecting the signal f from
By sending write signal g to K, data from sequence controller IB is written using data signal i.

The four sequence controller connected devices check whether the specified number of data have been read with the sequence controller IB, and when the specified number is reached, Fi stops sending the transmission interrupt signal to the sequence controller IB, and the sequence controller After connecting the controller, connect f4A to paper control device 2.
Send completion signal 1 to λ. Display device 13 for two controllers
The three display devices send the completion signal d to A, and after displaying the completion externally, the two control devices are notified of the completion by the signal e. The program is changed in the following manner. After confirming that completion is displayed on the 0 display device 3λ, a program editing request is sent from the keyboard setting I to the signal M to the reactor control device 2 by key operation. The six program editing devices are activated by the signal cK from the two control devices. Program editing device for 6 people, data i from the keyboard device
[From this, it is determined whether the editing function shown in FIG. 3 is used, and the contents of the five random access memories for program storage are edited. In general, as shown in FIG. 3, a program editing device sends a signal k to two control devices after completion of zero editing, which includes program insertion, program deletion, program change, program search, etc. In the case of two control devices, a signal d is sent to one display device for three persons, and after the display device for three persons displays an indication that one editing has been completed externally, a signal e is sent to the control device f2A to notify P completion. The method of storing the change results in the sequence controller is as shown below.

After confirming that the display device 3AK is displaying the end, a request to write the entire area in the program loader to the sequence controller is sent to the control device 2AK by signal a from one keyboard device by key operation. The two controllers determine whether it is a read/write, and then activate the four sequence controller connection devices by a signal. sequence con)
Roller connection device +A is sequence controller IB
Sends the transmission interrupt signal C to the sequence controller I.
A transmittable signal f from B is sent. After the signal f from the sequence controller IB is received, a read signal g is sent to the program storage random access memory 5λ, and the data in the program loader is written to the sequence controller IB [one instruction at a time] according to the data signal amount.

Sequence controller 9 Connection 1 & Device 4 A Fi
Check whether the specified number of writes have been made to the sequence controller IB, and when the specified number is reached, stop sending the transmission interrupt signal to the sequence controller IB, and the four sequence controller connected devices Control device 2AK sends completion signal j.

In the case of two control devices, the display device 3AK sends the completion signal d.0 In the case of three control devices, the completion is displayed externally.

Signal e notifies the two controllers of completion.

With the above, change the contents ftf of the sequence controller,
It is now possible to write the changed results to the sequence controller again.

Effects of the Invention By being equipped with a high-density, large-capacity random access memory, the entire sequence controller program area is stored in the program loader, and the sequence controller is not used by a program editing device that uses the same memory. It is now possible to edit the program.

It is possible to reduce accidents related to program destruction due to incorrect operation of the program loader, and to shorten plant stoppage time due to the sequence controller being stopped while the program loader is in use.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a conventional program loader, FIG. 2 is a block diagram of an embodiment of the present invention,
FIG. 3 is a processing flowchart of the program editing device. I000. Keyboard device A2...Control device λ3.
...Display device A4...Sequence controller teatA5...
Program editing device 6 people...Random access memory for work B1...Sequence controller B2...Program memory capacity IA...Keyboard device 2 people...Control device 3 people...
・・Display device 4 people・Sequence controller wa device 5 people・・
Random access memory 6A for program storage...
Program editing device for 7 people...Random access memory for work 1B...Sequence controller Figure 1 Figure 3

Claims (1)

[Claims] In a program loader that is removable from the sequence controller, has a keyboard section 5 display section, and a control section, and performs programming and loading of the program contents of the sequence controller through key operations, the sequence controller is attached to the sequence controller in addition to the working random access memory. a program editing device using a random access memory area for program storage having the same program memory capacity as the program memory capacity, and the random access memory area for program storage;
7. Program loader, which is characterized by the ability to edit programs while the sequence controller is disconnected.