JPS5926043B2 - sequence controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sequence controller, and particularly to a sequence controller that allows easy changes in control specifications such as expansion or reduction of control scale.

Recently, so-called sequence controllers, which are control devices that use a stored program method, have appeared, and due to the flexibility of their programs, they are beginning to replace conventional relay boards made of hard wires.

It is true that if the stored program method is adopted, modifying or changing the program will be easier and faster than changing the wiring using hard wires. Even so, the program is modified by reading the program written on the tape using a reader, etc., and storing the new program in memory, so the operation is done by a friend or a friend in order to make this modification without errors. requires appropriate training, and is not yet sufficiently easy to operate at the field level. Furthermore, prior to developing the present invention, the inventors considered configuring a memory for storing programs, so-called main memory, in a building block format. To briefly explain this method, programs according to various specifications are divided into blocks and stored in one or several LSI memory chips. If control specifications are added, a memory chip storing a program related to the additional specifications is additionally placed on the memory board. However, in general, the central processing unit (hereinafter referred to as CPU) and main memory in a sequence controller are the central parts of the system, and malfunctions in them can have a fatal impact on the system, so it is not recommended to request operation or modification of these parts. It was found that this placed an excessive burden on on-site workers. In addition, for example, when a program is stored on an LSI chip, the mechanical strength of each terminal (pin) of the LSI chip is low, and repeated mounting may deform each terminal and reduce the contact function. In some cases, it even broke. In any case, manipulating and processing the memory board in response to specification changes is not appropriate for sequence controllers that require ease of operation at the field level. Therefore, in the present invention, a memory storing a program according to the additional specifications is installed in a part of the device necessary for realizing the additional specifications, and is placed integrally with the CPU, which should also be called the central memory. This section stores a management program for managing the program sequence corresponding to the addition of the device, as well as programs related to the basic specifications, if any are essential. And C.P.
In the U, the program for the central memory and the installed additional specifications are executed together, and the control scale can be changed depending on the implementation of the device for the additional specifications, thereby simplifying changes in the control specifications. The purpose of the present invention is to provide a sequence controller that is not only easy to use, but also has high operability at the field level. Next, in order to facilitate the explanation, a loom management system in which the present invention can be implemented will be briefly described before describing the embodiments.

Several hundred looms are installed in the loom factory.

Although most of these looms perform regular weaving, other fibers may require special weaving, such as multicolor weaving or weaving with warp tension control. Furthermore, it is not known in advance which looms require these special weaves. On the other hand, the specifications of each loom are likely to change every day or every few days. Therefore, in principle, it would be good if all looms could weave all types of fabrics, but this would increase equipment costs, so control programs could be added or changed as necessary. It is better to do so. Moreover, it is desirable that this can be easily performed even by an operator at the site. The present invention relates to a sequence controller suitable for controlling a system in which control specifications are often changed, such as the above-mentioned loom system. The present invention will be explained below based on the drawings. FIG. 1 shows a block diagram of an embodiment system.

Reference numeral 1 denotes a basic control device, which controls a controlled device 6 by decoding and executing programs in memories 2, 3, and 4 with a CPU 5.
Manage and control.

The memory 2 in the basic control device 1 stores the minimum necessary programs to control the controlled device 6, and by executing this program, the basic operation of the controlled device 6 is ensured.

Signals are exchanged between the controlled device 6 and the basic control device 1 via an interface circuit (referred to as 1/F) 7. Selection control devices 9 and 10 are connected to the bus 8 .

Selection control is control related to specifications added to basic control.
Examples include multicolor weave control and tension control, which may or may not be applied depending on the control specifications of the controlled device 6.
In the selection control device 9 (or 10), a control circuit for additional specifications is built into the I/Fll (or 12). A signal to this control circuit is given by the CPU 5 by executing a program stored in the memory 3 (or 4). I/Fll (or 12
) is transmitted to the controlled device 6. Further, the selection control circuit 9 (or 10) not only outputs output, but also performs input control for transmitting the operating status of the controlled device 6 to the CPU 5. In this system, the control scale increases or decreases depending on whether the selection control circuit 9 or 10 is installed, and a program for managing this increase or decrease is stored in the central memory 2 of the basic control device 1. .

Further, FIG. 4 shows a sketch of the apparatus in which this embodiment is implemented.

The housing 13 includes a power supply 14, a CPU board 15, and a memory board 1.
6. A control board 17 on which various circuits necessary for controlling the basic operations of the controlled device 6 are mounted, and interface (hereinafter referred to as 1/F) boards 18 and 19 with the controlled device 6 are arranged. In another part of the housing 13, a space is provided for arranging a selection control printed circuit board (selection control device) 20 in order to meet additional specifications. On this selection control printed circuit board, a semiconductor memory LSI 22 is mounted together with various circuit components 21 constituting a control circuit. There are various types of printed circuit boards 20 for selective control, and by increasing or decreasing the number of printed circuit boards 20 or selecting them, the control contents for the controlled device 6 can be changed. FIG. 3 shows details of the system shown in FIG.

To show the correspondence between this figure and FIG.
Each constitutes a selection control device 9 or 10. In addition,
In FIG. 3, the same parts as in FIG. 1 are given the same reference numbers. Next, the operation of the embodiment system will be explained with reference to the flowchart of FIG. 2 and the detailed block diagram of FIG. 3.

When performing normal weaving control, the selection control devices 9 and 10 are not installed, and signals are exchanged between the loom main body 6 and the CPU 5 only via the L/F 7.

Now a first selection control is required, for example a multicolor weave, and a first
When the selection control device 9 is installed, the loom main body 6 and the CPU 5
A path for signal transmission is formed between the selection control device 9 and the selection control device 9. Assume that the loom 6 issues a request regarding multicolor weaving control. The signal indicating this request is
The signal is transmitted via the input coupler 23 to the I/O control unit 24, which corresponds to I/Fll in FIG. Furthermore, this signal is connected to an OR circuit 25 and an interrupt line 84 to which the output is connected.
When there is an O interrupt that interrupts the CPU 5 via the CPU 5, the CPU 5 executes a program in the central memory 2 to analyze the cause of the interrupt, as shown in FIG.

When an interrupt occurs, the program counter and other necessary registers (not shown) are
Initial processing such as saving is performed. Next, routine SP2
At , it is determined whether or not there has been an interrupt from the first selection control device 9.

Specifically, data specifying the I/O control unit 24 is output from the address bus 81, and a control signal indicating input/output control is output from the control line 83. The above data (this specifies the peripheral device, so it is usually the device number D
(referred to as VN) is applied to the decoder 26, and its output triggers the I/0 control unit 24. This results in
The input state of the 1/O control unit 24 is transmitted to the CPU 5 via the data bus 82. The CPU 5 determines whether the state of the above-mentioned OR circuit 25 is [1] or "O" from the transmitted input information.
Determine whether In this case, since the state of the OR circuit 25 is "1", the CPU 5 understands that the loom 6 requests control regarding multicolor weaving. At the same time, it is confirmed that the selection control device 9 is installed. Therefore,
In this routine SP2, control is transferred to a routine SRl in which a program for multicolor weave control is stored. Next, when the start address data of the routine SRl is output from the address bus 81, the memory 3 is activated by the decoder 26, and the routine SRl in the memory 3 is sequentially executed by the CPU 5. In this routine SRl, what kind of interrupt input is received from the loom 6 is individually analyzed and detected, a program corresponding to each interrupt (request) is executed, and the relay 27,
The A/O converter 28 is driven to provide desired control to the loom 6.

On the other hand, for basic control, that is, to obtain weaving length data by integrating the weft thread driving operations of the loom, an interrupt via I/F7 is detected in routine SP4, and in response to this, routine SRO
This is done by executing

Furthermore, as can be seen from the above, in this embodiment system, no interrupt is applied to the CPU 5 unless the selection control device (corresponding to the printed circuit board 20) is mounted.

Therefore, by inserting and removing the printed circuit board 20, changes such as expansion or reduction of the control scale can be easily made. In this way, the loom manager can select a control board or device prepared in advance (of course, a program for selective control is built in therein) as needed.

), control specifications can be easily changed. Regarding the point that the selective control board is prepared in advance, this does not mean that additional control boards are prepared for all the looms in the factory. That is, a loom factory usually has several hundred looms, and it is highly unlikely that all of these looms will be controlled according to additional specifications. In other words, it would be quite useful to stock up on additional control boards for only a few dozen units and then selectively place them as needed. Further, equipment adjustment or maintenance work is always required due to changes in specifications, and a few minutes spent relocating a board or device is not a problem. The control device for additional specifications may consist of several or more printed circuit boards depending on the control scale, but in such cases, special markings are attached for each specification.
It is better to devise ways to make identification easier.

Another method for ensuring reliable mounting is to mechanically integrate several boards and separately provide a connector for connection to the CPU, as shown in Figure 4. It is also a good idea to insert it into the housing in a similar way.
As described above, according to the present invention, the programs to be decoded and executed by the central processing unit are not concentrated only in the central side, but the memory in which the predetermined control program is stored can be added or Since the control specification can be changed by deleting it, it is extremely easy to change the program, and a highly flexible system can be configured. or,
In the present invention, since the memory storing the control program is integrated with the control circuit, the device in which it is installed can have sufficient mechanical strength, and can therefore be handled somewhat roughly. This is especially suitable for systems where changes in specifications are required at the field level. Furthermore, in the present invention, desired control is added to the controlled device by an interrupt from the selection control device.
Requests from controlled devices are immediately transmitted to the central processing unit, allowing additional control to be performed quickly.

Further, when the occurrence of a request (interruption) is detected, it is certain that the control circuit necessary to realize the request is installed, so a safe and secure system is constructed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the embodiment, FIG. 2 is a flowchart, FIG. 3 is a detailed block diagram of the embodiment, and FIG. 4 is a sketch of the apparatus of the embodiment. 1...Basic control device, 2...Central memory, 3, 4...Memory, 5...CP
Ul6...Controlled device, 9,10...
Selection control device, 24...I/0 control unit.

Claims (1)

[Claims] 1. In a sequence controller for controlling a controlled device by executing a program stored in a memory device in a central processing unit, the sequence controller includes a memory storing a control program for performing predetermined control on the controlled device, and A selective control device integrally configured with a control circuit for exchanging signals with the control device can be additionally connected to the central processing unit, and the central processing unit receives an interrupt signal via the control circuit. Then, a management program is executed to analyze and detect the cause of the interrupt, and based on this detection result, control is transferred to the control program stored in the memory,
The sequence has a configuration in which the control program is executed by the central processing unit to perform desired control on the controlled device, and control specifications are changed depending on the selection control device. controller.