JPH06250709A - Peripheral equipment of programmable controller - Google Patents

Abstract

PURPOSE:To enable an operator to easily recognize an input/output element whose state is fixed and to easily perform operation monitoring, etc., by displaying a specified fixed input/output element with a fixed state symbol instead of a symbol when a ladder circuit is displayed. CONSTITUTION:On a keyboard 13, the fixed input/output element to be set fixedly ON or OFF in the ladder circuit is specified together with a fixed ON or OFF state. In a RAM 15, symbols corresponding to the respective input/ output elements of the ladder circuit and fixed state symbols indicating ON or OFF fixed state by the input/output elements are stored corresponding to each other. When the ladder circuit is displayed, the ladder circuit is deciphered by a CPU 10 and the specified fixed input/output element is displayed with the fixed state symbol corresponding to the specified fixed state instead of its symbol by retrieving the RAM 15. Consequently, the operator easily recognizes which input/output element is specified into the fixed state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is based on provisional operation of a programmable controller (hereinafter, simply referred to as "PC"), a temporary operation using a smaller number of PCs than a link system of a plurality of actually operated PCs. The present invention relates to a peripheral device capable of easily performing a trial run in a linked state without changing a sequence control program.

[0002]

2. Description of the Related Art Conventionally, a system in which a plurality of PCs are connected to a link line and the state of an input / output element belonging to another PC can be referred to from one PC to perform interlock control between the PCs. It has been known. In such a system, each PC transmits the status of the input / output element referenced by the other PC to the other PC via the link line. Then, the PC that receives the state of the input / output element stores the state in the link element memory that can be accessed similarly to the state of the input / output element belonging to its own PC. In this state, when the order control program executes an instruction that refers to the state of an input / output element belonging to another PC, the link element memory is accessed.

[0003]

However, the system is not always operated with all the PCs connected to the link line. For example, there is a case where the system is operated without connecting a certain PC, or the operation state of the system is confirmed or checked without connecting a certain PC during maintenance, system trial operation, or partial operation during system construction. .

In such a case, the state of the input / output element in the PC which is not connected to the link line or which is not powered is changed to another P state via the link line.
Since it is not transmitted to C, the content of the address of the link element memory corresponding to the PC not connected in the link element memory of each PC becomes uncertain. However, since the sequence control program is programmed as if all PCs are connected, the PCs that are not connected are
The address of the link element memory corresponding to is also accessed, and the order control does not follow the original design.

Therefore, when operating the system without connecting a certain PC, it is necessary to tentatively correct the sequence control programs of all the PCs that refer to the states of the input / output elements of the PC. Further, when the system is actually operated as originally designed, it is necessary to restore the sequence control program of each PC to the original state again, and it takes a great deal of labor and time to correct these programs. . Alternatively, in order to fix the state of the referenced non-linked input / output element, it is necessary to change the wiring for the input / output element.

Further, even in a system other than a system in which a plurality of PCs are linked, that is, even in a system using a single PC, there are cases where it is desired to fix the state of a certain input / output element to ON or OFF during maintenance, inspection, etc. is there.

In such a case, the original ladder circuit in which the states of the input / output elements are not fixed at all must be preserved for normal operation. Therefore, when a certain input / output element is set in a fixed state, if it is not displayed so that the operator can understand it, a problem may occur in the operation analysis of the ladder circuit.

The present invention has been made to solve the above problems, and its object is to a single PC or a system at the time of actual operation without modifying the ladder circuit. In a system not connected to a PC, it is possible to easily perform a trial run of the system, a partial operation at the time of constructing the system, maintenance and the like.

[0009]

SUMMARY OF THE INVENTION The present invention provides a peripheral device for creating and displaying a ladder circuit corresponding to a sequence control program for a programmable controller,
Of the input / output elements referenced in the ladder circuit,
Regardless of the actual state, a fixed input / output element to be fixed on or off, a designation means for designating with a fixed state of on or off, a symbol corresponding to each input / output element in the ladder circuit, For each input / output element, a fixed state symbol storage means that stores a fixed state symbol indicating an ON or OFF fixed state in association with each other, and a ladder circuit is decoded when the ladder circuit is displayed. A display means for searching the fixed state symbol storage means for the fixed input / output element designated by the designating means, and displaying the fixed state symbol corresponding to the fixed state designated by the designating means. Is provided.

[0010]

In the ladder circuit, the fixed input / output element to be fixed in the ON or OFF state is specified together with the fixed state in which it is fixed whether to fix the ON state or the OFF state in the ladder circuit. For example, given as a table.

The fixed state symbol storage means associates a symbol corresponding to each input / output element in the ladder circuit with a fixed state symbol indicating an ON or OFF fixed state for each input / output element. Is remembered.

When the ladder circuit is displayed, the display circuit decodes the ladder circuit and the fixed state symbol storage means is searched for the fixed input / output element designated by the designating means instead of the symbol. Then, the fixed state symbol corresponding to the fixed state designated by the designating means is displayed.

As a result, when the input / output element in the ladder circuit is designated to be in the fixed state, the worker can easily recognize the fact by the fixed state symbol. Therefore, it is possible to easily check the ladder circuit and monitor the PC during operation.

[0014]

EXAMPLES The present invention will be described below based on specific examples. FIG. 2 shows the configuration of a transfer machine controlled by a plurality of PCs PC01 to PC32. Stations of transfer machine ST0, ST1L, ST1R, ... ST3R
Are controlled by corresponding PCPC01 to PC32, respectively, and each PCPC01 to PC32 is coupled to each other by a link line L. In addition, each station ST
0, ST1L, ST1R, ... ST3R are provided with devices M1, 11M, ... 32M, respectively, as shown in the drawing.

FIG. 1 is a block diagram showing a specific configuration of the peripheral device of this embodiment. A CPU 10 for creating, modifying, and displaying a ladder circuit diagram, designating fixed input / output elements and a fixed state, and automatically changing a program, a ROM 11 storing a program for the processing, a CRT 12 for displaying a ladder circuit and an operating state. , A symbol input / output element data for creating a ladder circuit, a fixed input / output element and fixed state designation data, a keyboard 13 for inputting various commands, and an input / output interface interposed between the CPU 10 and the CRT 12 and the keyboard 13. 14, a RAM 15 for storing the source program and the object program of the ladder circuit, a floppy disk device for storing the source program stored in the RAM 15 on a floppy disk, and an interface 17 for connecting to the PC 01. In addition, RAM15
Stores a fixed input / output element designation area 151 for storing the designated fixed input / output element and the fixed state as a table, a ladder circuit diagram area 152 for storing a ladder circuit diagram by a symbol, and a source program corresponding to the ladder circuit. A source program area 153, an object program area 15 for storing an object program in a PC execution format
4, a link parameter area 155 for storing link parameters, and a fixed state symbol area 156 for storing fixed state symbols corresponding to symbols of each input / output element and its two fixed states are formed.

As shown in FIG. 3, the PC 01 stores a CPU 20 for sequence control and communication control, a sequence control program (object program) and link parameters, and a state of input / output elements to be controlled and It has a RAM 25 for storing the state of the link element received from the link line, and a ROM 21 in which a program for processing execution of the CPU 20 is stored. Input / output element 270
1, 2702 and the like are controlled by the CPU 20 via the drive circuit 27 and the input / output interface 24. RAM
An input element state memory 251, an output element state memory 252, an internal relay memory 253, a link element memory 254, a link parameter memory 255, and a sequence control program memory 256, which store the states of the input / output elements, are formed at 25. Further, the address X'2000 'consecutive to the internal relay memory 253 is the normally-on internal relay contact memory 257 storing "1" in the normally-on state, and the subsequent address X'2001' is in the normally-off state "1". A normally-off internal relay contact memory 258 storing "0" is formed. The sequence control program memory 256 stores an object program corresponding to a ladder circuit that defines sequence control. Further, the internal relay memory 253 is used as a virtual relay for relaying the ladder circuits of each row.

In the RAM 25, addresses 0000 to 1FFF are memories assigned to the input / output elements belonging to the own PC, and the states of these input / output elements can be determined by referring to the contents of this address. Also, from address 3000
The 3FFF address is an address commonly assigned to all input / output elements referenced by other PCs in all PCs. Hereinafter, the virtual input / output element assigned to this common address is called a link element, starting from address 3000.
Address 3FFF is called link element memory.

When all the PCs are connected to the link line L and all the PCs are activated, the value of the link element memory 254 is always common to all the PCs due to the communication control of a minute time interval. It is a value. Therefore, when referring to the input / output element states of another PC in one PC, the value of the link element memory 254 is referred to.

In each PC, a sequence control program is created according to the ladder circuit diagram shown in FIG. In the ladder circuit diagram of FIG. 4, input elements are contacts such as relays and limit switches, and output elements are relay coils. Input and output elements are collectively called input / output elements.

As shown in FIG. 4, each input / output element is a PC.
A signal name with an address of a memory used when the state of the input / output element is referred to is attached. For example, "X0
"10" indicates the address of the input element belonging to its own PC assigned to the address 0010. Further, "L000" indicates the address of the link element assigned to the address 3000, that is, the virtual input / output element that holds the same state as the state of the input / output element belonging to another PC.

For example, the input element "X04 belonging to PCPC01
If "0" is referenced from PCPC11, PCPC01
In the ladder circuit of, a link circuit that makes the state of the input element “X040” equal to the state of the link element “L000” is added. The value of this link element "L000" is set to the link element memory 254 in all other PCs by mutual communication.
Written at address 3000. Therefore, in the program of PCPC11, the state of the input element "X040" belonging to PCPC01 can be referred to by referring to the value at address 3000 of the link element memory 254.

Conversely, the input element "X1 belonging to PCPC11
If "00" is referenced from PCPC01, PCPC11
In the ladder circuit of, a link circuit that makes the state of the input element “X100” equal to the state of the link element “L014” is added. The state of the link element "L014" of PCPC11 is transferred to the address 3014 of the link element memory 254 of PCPC01 and all other PCs by communication, and the state of the input element "X100" belonging to PCPC11 is the link element of all PCs. By referring to the value of address 3014 of the memory 254, PCPC11
The state of the input element "X100" belonging to can be referred to.

The values of the link element memory 254 in all PCs are mutually communicated so as to take the same value.
The data sent to the link line L is, for example, from the start bit to 10 bits, the link data output from the PCPC01 (data indicating the status of the link element), and the subsequent 7 bits are the link data sent from the PCPC11. And the following 8 bits are defined like the link data sent from the PCPC12.

RAM 250 has link parameters shown in FIG. 5 which define how many bits of data each PC sends to the link line L at which timing and how many bits of data are received from the link line L at each timing. It is stored in the link parameter storage area 255. For example, in the link parameter of PCPC01, 10 bits from the start bit transmit data, the next 20 bits receive data from the link line L, the next 10 bits receive data, and so on. It is the specified data.

Each PC updates the address for accessing the link element memory 254 in order from the address 3000 in synchronization with each PC. Then, the currently accessed address determines whether the data is transmitted or received according to the link parameter. Then, for the address determined to be transmitted, the state of the link element stored at that address is output to the link line L, and for the address determined to be received, it is received from the link line L. The data is stored at that address as the state of the link element. By such communication control in each PC, all the address values of the link element memory 254 in all PCs are always the same.

The sequence control program created on the premise of the link system as described above does not operate unless the PC specifying the state of the linked link element is linked. For example, when PCPC11 is not linked, the sequence control program of PCPC01 cannot be operated. Because the sequence control program of PCPC01 refers to the link elements "L014" and "L016", the states of the link elements "L014" and "L016" are PCPC.
This is because it is first determined by obtaining the state data of the 11 input elements “X100” and “X102” by communication.

The present invention makes it possible to execute the sequence control program of PCPC01 even if PCPC11 is not linked as described above. The method will be described below.
The ladder circuit diagram shown in FIG. 4 is stored in the ladder circuit diagram area 152 of the peripheral device 1. FIG. 6 shows C of the peripheral device 1.
It is a program executed by the PU 10 for designating fixed input / output elements and fixed states.

In step 100, the circuit is displayed on the CRT 12 from the head of the designated ladder circuit, and in step 102, the cursor is displayed on the displayed input / output element. At this time, the operator can know from the number added to each input / output element whether the input / output element is an element referred to by another PC, that is, a link element. When the output element is to be a fixed input / output element, the operator presses a designated key on the keyboard 13. In step 104, it is determined whether or not the designated key is turned on. When the designated key is turned on, the fixed input / output element name designated in the fixed input / output element designation area 151 of the RAM 15 is stored. Next, in step 110, fixed state data indicating whether the fixed input / output element is in the normally-on state or the normally-off state is input from the keyboard 13, and in step 112, the fixed input / output element name and the fixed state are fixedly input. It is created in the output element designation area 151 in a table format. When the designation of one fixed input / output element is completed, the process returns to step 100, the cursor is moved to the position of the next input / output element, and designation or non-designation of the input / output element indicated by the cursor is performed. If it is not designated as a fixed input / output element in step 104, it is determined in step 106 whether or not the sequence control program is the final one. If not, the process returns to step 100,
Specified or unspecified for the next input / output element is executed. In this way, the fixed input / output element designation table is created as shown in FIG.

Next, a method of changing the program will be described with reference to FIG. FIG. 8 shows the CPU of the peripheral device 1.
11 is a flowchart showing a processing procedure by 10. In step 200, input / output elements are sequentially searched in the ladder circuit as shown in FIG. 4 stored in the ladder circuit diagram area 152. Next, at step 202, the input / output element is the fixed input / output element designation area 15
Whether or not it is a fixed input / output element is determined by whether or not it is described in the fixed input / output element table stored in 1. Next, in step 204, similarly, the fixed state of the input / output element is read by referring to the fixed input / output element table stored in the fixed input / output element designation area 151, and the fixed state is the normal ON state. It is determined whether it is "1" or the normally-off state "0".

If the fixed state is the normally-on state "1", in step 206, the fixed input / output element is the address X'2 of the normally-on internal relay contact memory 257 of the PC.
Change to 000 '. Similarly, the fixed state is always off state "0"
If so, in step 208, the fixed input / output element is changed to X'2001 'which is the address of the normally-off internal relay contact memory 258 of the PC.

Next, in step 210, it is judged whether or not the input / output element to be searched is the last of the ladder circuit. If not, the process returns to step 200 and the next input / output element of the ladder circuit is searched. In this way, step 2
The address of the input / output element designated as the fixed input / output element is changed to the address of the normally-on internal relay contact memory 257 or the normally-off internal relay contact memory 258 of the PC until it is determined at 10 that the last of the ladder circuit is reached. It In this way, as shown in FIG. 9, the input / output element “M123”,
"X150" and link element "L014" are "2000", input / output element "M200" and link element "L016" are "200"
The ladder circuit changed to "1" is generated.

Next, in step 212, the modified ladder circuit is converted into an object program,
It is stored in the object program area 154. Next, in step 214, the object program stored in the object program area 154 is loaded into the designated PC. The PC will execute the modified ladder circuit shown in FIG.
At this time, the input / output element “2000” has the normally-on state “1” which is the value of the normally-on internal relay contact memory 257, and the input / output element “2001” has the normally-off internal relay contact memory 258.
Is executed as the normally off state “0” which is the value of. As a result, the PC referred to by the input / output elements "L014" and "L016"
Even if the state of the input / output element of the PC11 is not specified because the PCPC11 is not linked, the PCPC01 can execute the sequence control program. Moreover, even if the input / output elements “M123”, “X150”, and “M200” in PCPC01 are
It is possible to sequentially execute the control program with the state fixed to ON or OFF.

On the other hand, when displaying the ladder circuit designated to fix the state on the CRT 12, the CPU 10
Executes the processing program shown in FIG. In step 300, input / output elements are sequentially searched in the ladder circuit as shown in FIG. 4 stored in the ladder circuit diagram area 152. Next, in step 302, the input / output element is the fixed input / output element designation area 151.
Whether or not it is a fixed input / output element is determined by whether or not it is described in the fixed input / output element table stored in. Next, at step 304, similarly, the fixed state of the input / output element is read by referring to the fixed input / output element table stored in the fixed input / output element designation area 151, and the fixed state is the normally-on state. It is determined whether it is "1" or the normally-off state "0".

The fixed state symbol area 1 of the RAM 15
As shown in FIG. 10, data indicating symbols of each input / output element and data of fixed state symbols in the ON fixed state and the OFF fixed state are stored in a table 56. Further, the fixed state symbol also has a symbol for distinguishing a link element from an element that is not a link element.

If the fixed state is the normally-on state "1", the fixed state symbol area 156 is searched in step 306 and the data of the ON fixed state symbol is extracted. In addition, the judgment whether it is a link element or not a link element,
This can be determined by referring to the link parameters shown in FIG. 5 stored in the link parameter area 155. Then, the corresponding input / output element of the ladder circuit is replaced with the extracted ON fixed state symbol. Similarly, if the fixed state is the normal off state “0”, the fixed state symbol area 156 is searched in step 308 and the data of the off fixed state symbol is extracted. Then, the corresponding input / output element of the ladder circuit is replaced with the extracted off fixed state symbol.

Next, in step 310, it is judged whether or not the input / output element to be searched is the last of the ladder circuit. If not, the process returns to step 300 and the next input / output element of the ladder circuit is searched. In this way, step 3
The symbol of the input / output element designated as the fixed input / output element is replaced with the symbol indicating the fixed state until it is determined at 10 that the final of the ladder circuit.

Next, in step 312, the symbol-substituted ladder circuit is displayed on the CRT 12, as shown in FIG. Therefore, the worker is
It is possible to recognize at a glance which input / output element is designated as a fixed state by looking at the screen, and it is possible to easily monitor the operation. Since the ladder circuit which is not designated to fix the state is stored in the source program area 153 as it is, the state control can be released and the sequence control program can be executed. Therefore, the operator does not need to perform any processing such as correction and restoration of the program.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a peripheral device according to a specific embodiment of the invention.

FIG. 2 is a block diagram showing a configuration of a transfer machine using a PC.

FIG. 3 is a block diagram showing the configuration of a PC to which peripheral devices of the device of this embodiment are connected.

FIG. 4 is a circuit diagram showing a ladder circuit corresponding to a PC sequence control program.

FIG. 5 is an explanatory diagram showing link parameters for executing a PC link procedure.

FIG. 6 is a flowchart showing a processing procedure for designating a fixed input / output element in the peripheral device of this embodiment.

FIG. 7 is an explanatory diagram showing a relationship between a designated fixed input / output element and a designated fixed state.

FIG. 8 is a flowchart showing a procedure for correcting a ladder circuit by the peripheral device of this embodiment.

FIG. 9 is a circuit diagram showing a modified ladder circuit.

FIG. 10 is an explanatory diagram showing a correspondence relationship between symbols of input / output elements and fixed state symbols.

FIG. 11 is a flowchart showing a procedure for generating a ladder circuit to be displayed on the screen by the peripheral device of this embodiment.

FIG. 12 is an explanatory diagram showing a ladder circuit displayed on the screen.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Programming device 10 ... CPU (designating means, display means) 13 ... Keyboard (designating means) 12 ... CRT 15 ... RAM (designating means, fixed state symbol storage means) Steps 100 to 112 ... Designating means Steps 300 to 312 ... Display means

Claims (1)

[Claims] 1. A peripheral device for creating and displaying a ladder circuit corresponding to a sequence control program for a programmable controller, wherein the state of input / output elements referred to in the ladder circuit is the actual state. Irrespective of whether the fixed input / output element to be fixed on or off is specified together with the fixed state of on or off, a symbol corresponding to each input / output element in the ladder circuit, and each of the input / output elements A fixed state symbol storage means that stores a fixed state symbol indicating an ON or OFF fixed state in association with the fixed state symbol storage means; and, when displaying the ladder circuit, decodes the ladder circuit to specify the designation means. For the fixed input / output element designated by, the fixed state symbol storage means is searched instead of the symbol. And a display unit for displaying a fixed state symbol corresponding to the fixed state designated by the designation unit.