JPH07281718A - Cross reference preparing method for sequence data - Google Patents

Abstract

PURPOSE:To prepare cross reference at high a speed by adding different ladder numbers, block numbers and types to the components of a ladder sequence circuit and calling any correspondent numbers and types from a table. CONSTITUTION:When a program concerning the objective ladder sequence circuit is inputted to a CPU 20, the CPU 20 stores this program in an internal storage device and outputs it to a CRT 10 or a printer 15 while adding the cross reference by executing instruction analysis processing. In this case, first of all, the CPU 20 prepares nodes by adding the ladder NO, block NO and types to a coil, A contact and B contact being all the components of this ladder sequence circuit. Next, the correspondent ladder NO, block NO and types are successively read out of the cross reference table concerning the respective components, and the cross reference is prepared.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of creating a cross reference of a contact or a coil which is necessary when debugging or changing specifications of a ladder sequence circuit used in a programmable controller or the like.

[0002]

2. Description of the Related Art Since programmable controllers have the characteristic that control programs can be easily created and edited, most of the production machines currently used in factories, etc. Is being controlled.

However, when the control contents are changed, it is necessary to change the program as a matter of course. However, if the number of steps of the program is small, this work for changing the program does not require much man-hours. Therefore, there is no problem, but if the number of steps is large, it will take a very long time.

Conventionally, a cross reference is displayed on the ladder sequence diagram in order to reduce the number of work steps.

Specifically, as shown in FIG. 8, the block No. of the sequence is displayed on the left side of the displayed ladder sequence diagram. This corresponds to the step number. A cross reference is attached to all of the contacts, coils, etc. that make up each block. For example, the contact R000 in the figure is 3
Although a cross reference of 94 is attached, this means that the coil driving this contact R000 exists in the block NO394, and R00.
A cross reference of 21 attached to the 0 coil means that the contact driven by this coil R000 exists in the block NO21.

Therefore, if this cross reference is added in the drawing, it is possible to easily identify where the related contacts and coils are located. In addition,
This cross reference is for each function X, Y, R, T, K,
Each of U, C, G, ..., M will be stored as a table at an address secured in 000 to FFF. The symbols used in the ladder sequence diagram are illustrated at the bottom of the figure.

Further, the data structure of the conventionally used cross reference table has a structure as shown in FIG. 9, but its detailed description is omitted here.

The creation of this cross reference is carried out as follows based on the conventional flow charts shown in FIGS.

First, when an instruction to create a cross reference is issued, all the data of the ladder circuit is loaded into the memory and the instruction analysis process is started (S1, S2). next,
The function of the ladder circuit corresponds to one of the functions X to M shown in FIG. 8 described above, and the address 000 to FFF is checked to determine the function 000 to Prepare to refer to the FFF table (S3, S4). If the component currently referred to is a coil (S5), the attribute flag of the table shown in FIG. 9 is turned on for 3 bits, 1 is added to the coil appearance counter of the table, and the coil block NO of the table is If it is empty, a process of storing the block NO is performed (S6).
Next, if the referenced component is an up coil, the above attribute flag is turned on for 5 bits (S7, S8), and if it is a down coil, the attribute flag is turned on for 6 bits (S7).
9, S10), if the reset coil, the attribute flag 7
Perform each bit ON process (S11, S1
2).

If it is determined in step S5 that the coil is not a coil and the constituent element is an A (P edge) contact, the attribute flag of the table is set to 1 bit O.
At the same time as N, 1 is added to the contact appearance counter of the table (S13, S14), and the component is B (N edge).
If it is determined that the contact is a contact, the attribute flag of the table is turned on by 2 bits and 1 is added to the contact appearance frequency counter of the table (S15, S16).

Next, it is judged whether or not a corresponding comment exists, and if there is a comment, the attribute flag of the table is turned on for 4 bits (S17, S18), and the ladder instruction is advanced to the next component. Is performed (S19).
The above process is repeated until it is completed for all data (S20). In this way, the creation of the cross reference table for creating the cross reference is completed.

Next, the procedure for creating a cross reference based on this cross reference table will be described in detail with reference to the flowcharts shown in FIGS.

First, when the program starts, R0
Refer to the cross reference table for 00,
The examination of the attribute flags stored in the table is started (S31, S32). It is determined whether the attribute flag is 1, that is, whether there is an A contact (S3
3) If the A contact exists, the inspection of the ladder circuit is started (S34), and if the command is the A contact and R000, the block NO stored in the table is stored in the buffer (S35). ~ S37). When this process ends, the ladder command is sequentially advanced, and the processes from S35 to S38 are repeated until the above processes for all the ladder circuits are completed (S38, S39).

Next, it is judged whether the attribute flag is 2, that is, whether there is a B contact (S40),
If the B contact exists, the inspection of the ladder circuit is started (S4
1) If the command is the B contact and R000, the block No. stored in the table is stored in the buffer (S42 to S44). When this process ends, the ladder command is sequentially advanced, and the processes from S42 to S46 are repeated until the above processes for all the ladder circuits are completed (S45, S46).

Further, it is judged whether or not the attribute flag is 3 (S47), and if it is 3, the block No. stored in the table is stored in the buffer (S48). If the number of appearances of the coil in the table is 1, (S4
9) Then, the process is terminated as it is, and if it is not 1, the search for the ladder circuit is started again (S50), and the process of advancing the ladder circuit to the block No. of the table is performed (S51). Next, if the command is a coil and R000,
The block No. stored in the table is stored in the buffer (S52 to S54). This process is performed while advancing the ladder command until the number of coil appearance counters becomes equal to the number of actually searched coils (S55, S5).
6).

By performing the above processing, in the table as shown in FIG. 15, that is, in R000, the symbols are both contacts A and B, and the coil, and the A contact has a block NO of 10 , 21 and 50 appearing at three places, B contact appears at two places where block NO is 3,100, and the coil is 1 at block NO42.
A table is created so that you can see at a glance what has appeared in the place. Further, in the ladder sequence circuit diagram, as shown in FIG. 16, a cross reference is attached to each component.

[0017]

However, according to such a conventional method of creating a cross reference, the block NO of the contact point and the block NO of the second and subsequent coils.
Since the table is not stored in the table, when actually creating a cross reference, all ladder circuit data is searched to obtain the contact block, and when there are two or more coils, the coil appears. There is a problem that it takes time because the process of searching the ladder circuit data and acquiring the block number of the coil must be performed until the number of coils counted by the number of times counter is found.

Further, since the contact appearance frequency counter can handle up to 255 times, there is a problem in that it cannot handle when more contacts appear.

The sequence data cross-reference generation method of the present invention is made to solve the above-mentioned conventional problems, and the process of sequentially searching the constituent elements of the ladder sequence circuit is performed only once. The purpose is to provide a method for creating cross-references of sequence data that enables creation of cross-references with.

[0020]

According to the present invention for achieving the above object, a program relating to a target ladder sequence circuit is input, and each component of the ladder sequence circuit is a coil or an A contact. Yes, B
Whether the contact is a contact is recognized in order, and if the component recognized by this recognition is a coil, the type of this coil is further recognized, and all the components of the ladder sequence circuit, the coil, the A contact, and the B A node is created by assigning the ladder NO, block NO, and type to each of the contacts, and the corresponding ladder NO, block NO, and type are sequentially called from the cross reference table for each component of the ladder sequence circuit. It is characterized by creating a cross reference.

Further, the recognition of whether each constituent element of the ladder sequence circuit is a coil, an A contact, or a B contact is carried out in the order of ladder NO and each block NO.
The feature is that they are performed in order.

[0022]

According to the present invention having such a configuration, when reading the program relating to the ladder sequence circuit, it becomes possible to acquire all the block numbers of the respective coils and contacts required for creating the cross reference. Even when the cross reference is displayed on the monitor or printed out, it is not necessary to read the program relating to the ladder sequence circuit, and therefore the monitor display or print out can be performed at high speed.

The recognition of whether each component of the ladder sequence circuit is a coil, an A contact or a B contact is made in the ladder NO order and in each block NO order. Each component of the sequence circuit and the cross reference can be linked bidirectionally, and the search for the contact point or the like can be performed from both the cross reference side and the ladder sequence circuit side.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an apparatus that executes a ladder sequence data cross-reference generation method according to the present invention. This device corresponds to, for example, a programmable controller that controls the operation of a production machine, and as an output device, a CRT 10 that displays a ladder sequence circuit with a cross reference, and a printer 15 that prints out a similar circuit. Is provided. A ladder sequence circuit program is input to the CPU 20, and the input ladder sequence circuit program is processed in the CPU 20 as shown in the following flowchart and output in the state where the CRT 10 or the printer 15 is cross-referenced. To be done.

2 to 4 are flowcharts showing the procedure of the method for creating a cross reference of ladder sequence data according to the present invention. This processing is of course performed by the CPU 20.

First, the CPU 20 inputs and stores the ladder sequence circuit program in a storage device provided therein, and starts instruction analysis processing (S61, S).
62). Next, the function of the ladder circuit corresponds to the function of X to M shown in FIG. 8 described above, and the address of 000 to FFF is checked. , 000 to FFF table is prepared (S63, S64). If the component currently referred to is a coil (S65), the attribute flag of the table shown in FIG. 9 is turned on by 3 bits (S66). Next, if the referenced component is an up coil, the above attribute flag is turned on for 5 bits (S67, S68), and if it is a down coil, the attribute flag is turned on for 6 bits (S69, S70), and the reset coil is reset. In this case, the attribute flag is turned on by 7 bits (S71, S72).

After the above processing for the coil is completed, the coil node is registered in the node management structure of the cross reference table shown in FIG. 6, and each field (ladder NO, block NO, symbol) in this node is registered. Set a value to (Type). In addition, 1 for the total number of nodes
Is added (S73). If the symbol is the A contact, 1 is added to the attribute flag of the table, and the node for the A contact is registered in the node contact management structure for the A contact of the table, and each field (ladder NO, Set a value in (block No., symbol type). Further, a process of adding 1 to the total number of nodes is performed (S
74, S75). And if the symbol is the B contact,
Add 1 to the attribute flag of the table, register the B contact node in the B contact node management structure of the table, and set the value in each field (ladder NO, block NO, symbol type) in this node. To do. further,
Perform processing to add 1 to the total number of nodes (S76, S7)
7). Finally, it is judged whether or not there is a corresponding comment, and if there is a comment, the bit of the attribute flag of the table is turned on and the ladder command is advanced (S78 to S8).
0). The above process is performed until all components are completed (S81).

In the present invention, a node for cross reference as shown in FIG. 5 is prepared. The description of each field is as shown in the drawing, and this node is managed by the symbol-by-symbol management structure shown in FIG. Since the above-mentioned node can know where the same another node is, it is possible to connect as many nodes as possible, and this node is managed by the function group and data of the symbol-by-symbol management structure. As shown in FIG. 7, the cross reference table has three structures for A contact, B contact, coil, and attribute flag.

According to the present invention, when the ladder sequence circuit is read, all the data necessary for creating the cross reference can be fetched by performing the operation of reading this circuit only once.

Furthermore, the required nodes are not prepared in advance but added as needed, so that the memory capacity can be kept to the minimum necessary.

[0031]

As described above, according to the present invention, it is possible to obtain all the block numbers of each coil and contact required for creating a cross reference by a single reading process of a program relating to a ladder sequence circuit. Therefore, even when the cross reference is displayed or printed out on the monitor, it is not necessary to read the program related to the ladder sequence circuit, and the monitor display or printout can be performed at high speed.

The recognition of whether each component of the ladder sequence circuit is a coil, an A contact, or a B contact is made in the ladder NO order and in each block NO order. Each component of the sequence circuit and the cross reference can be linked bidirectionally, and the search for the contact point or the like can be performed from both the cross reference side and the ladder sequence circuit side.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an apparatus that executes a ladder sequence data cross reference creation method according to the present invention.

FIG. 2 is a flowchart showing a procedure of a method for creating a cross reference of ladder sequence data according to the present invention.

FIG. 3 is a flowchart showing a procedure of a method for creating a cross reference of ladder sequence data according to the present invention.

FIG. 4 is a flowchart showing a procedure of a method for creating a cross reference of ladder sequence data according to the present invention.

FIG. 5 is an explanatory diagram of a cross-reference node used in the method of the present invention.

FIG. 6 is an explanatory diagram of a symbol-specific node management structure used in the method of the present invention.

FIG. 7 is an explanatory diagram of a cross reference table used in the method of the present invention.

FIG. 8 is a diagram showing an example of a cross reference in a generally used ladder circuit.

FIG. 9 is a diagram showing an example of a data structure of a commonly used cross reference table.

FIG. 10 is a flowchart showing a conventional procedure for creating a cross reference table.

FIG. 11 is a flowchart showing a conventional procedure for creating a cross reference table.

FIG. 12 is a flowchart showing a conventional procedure for creating a cross reference.

FIG. 13 is a flowchart showing a conventional procedure for creating a cross reference. ,

FIG. 14 is a flowchart showing a conventional procedure for creating a cross reference.

FIG. 15 is a diagram showing an output example of a conventional cross reference.

FIG. 16 is a diagram showing an output example of a cross reference in a ladder circuit.

[Explanation of symbols]

 10 ... CRT, 15 ... Printer, 20 ... CPU.

Claims (2)

[Claims] 1. A program for a target ladder sequence circuit is input, and whether each constituent element of the ladder sequence circuit is a coil or an A contact,
Whether or not it is the B contact is recognized in order, and if the component recognized by this recognition is a coil, the type of this coil is further recognized, and all the components of the ladder sequence circuit, the coil, the A contact, A node is created by assigning the ladder NO, block NO, and type to each of the B contacts, and for each component of the ladder sequence circuit, the corresponding ladder NO, block NO, and type are sequentially selected from the cross reference table. A method for creating cross-references for sequence data, which is characterized by calling and creating cross-references. 2. The ladder sequence circuit is configured so that each of the constituent elements of the ladder sequence circuit is a coil, an A contact, or a B contact is recognized in a ladder NO order and a block NO order. The method for creating a cross reference of sequence data according to claim 1.