JP2914538B2 - Programmable controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable controller capable of handling word data.

[0002]

2. Description of the Related Art When controlling the operation of an electronic device, a programmable controller inputs an operation state signal from the electronic device, performs a sequence operation based on the operation state signal, and generates an operation instruction signal for the electronic device. Output to electronic equipment.

Conventionally, since an electronic device to be controlled is constituted by a relay, the operation state signal and the operation instruction signal are 1-bit data of on / off (referred to as bit data).
Was represented by

Recently, word data representing a numerical value with a plurality of bits (for example, 16 bits) can be handled by a programmable controller together with the above-mentioned bit data so that a set speed can be indicated by, for example, motor speed control. It has become

For this purpose, the memory in the programmable controller is divided into a storage area for bit data and a storage area for word data.

While the bit data storage area stores 16 bit data for one address, the word data storage area stores one word data for one address.

Further, the type of data is identified by making the leading symbol of the identifier assigned to data different between bit data and word data.

Such word data is 1 as described above.
The data is composed of 16 bit values, but since one identifier is given to all 16 bit values, only specific bit values out of 16 are extracted. Did not go like that.

[0009]

As described above, since the data storage area of the memory is fixedly divided for word data and bit data, handling of bit data in a sequence program created by a user is performed. If the amount is large, a storage area for bit data runs short. For this reason, the conventional apparatus has a problem that the user controls the number of bit data that can be used on the sequence program, in other words, the number of input / output contacts (devices).

In view of the above, an object of the present invention is to provide a programmable controller capable of increasing the amount of bit data handled without increasing the bit data storage area.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a programmable memory which can access word data stored in a built-in memory by using an identifier assigned to the word data. In the controller, a format of a parameter indicating a specific bit position in the word data is determined in advance, and it is determined whether the parameter is added to the identification name. Is identified as specific bit data in the word data, and in the case of a negative determination, data type identification means for identifying that the data to be accessed is the entire word data; If an identification result of the data is obtained, the bit position indicated by the parameter is stored in the memory on the memory. Characterized in that comprises an access means for performing access to Todeta.

[0012]

In the present invention, attention is paid to the fact that the number of word data used is smaller than the number of bit data used, and an unused area is likely to be generated in the word data storage area, and a specific bit of the word data is treated as one bit data Thus, the bit data is stored in the word data storage area. Also,
In order to realize such a function, a parameter is added to the identification name of the word data, and depending on the presence or absence of this parameter, whether the data to be processed is a plurality of bit data of the entire word data or a bit data at a specific position is determined. Identify the data content. Also, the bit position of the word data on the memory to be accessed by the access means can be determined from the above parameters.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a basic configuration of an embodiment of the present invention.

The programmable controller of this embodiment converts word data stored in a built-in memory 500 into
This is a programmable controller that can be accessed by an identification name assigned to the word data.

In this programmable controller, a format of a parameter indicating a specific bit position in the word data is predetermined. 1000 determines whether or not the parameter is added to the identifier, and in the case of an affirmative determination, identifies that the data to be accessed is specific bit data in the word data, In this case, the data type identification means identifies that the data to be accessed is the entire word data.

Reference numeral 2000 denotes access means for accessing the bit data on the memory at the bit position indicated by the parameter when the data type identification means obtains the identification result as bit data. .

FIG. 2 shows an example of a specific circuit configuration of the embodiment of the present invention.

The programmable controller is a main body of the programmable controller (also referred to as a CPU unit).
It is mainly composed of 200 and a programming device 100.

The programming device 100 can create a sequence program to be executed by the programmable controller main body 200, and can monitor contact information stored in the programmable controller main body.

The programming device 100 includes a central processing unit (CPU) 110 and a user program memory 12.
0, a display device 130, an interface 140, and a keyboard (not shown).

The CPU 110 creates a sequence program by expanding and storing a program command input from the keyboard in the user program memory 120.
This sequence program is instructed by the operator, and is executed by the CPU 1
Under the communication control of 10, communication is performed with the programmable controller main body 200 via the interface 140.

On the other hand, when the monitor mode is instructed by the operator, the CPU 110 receives the contact information corresponding to the sequence program from the programmable controller main body 200 via the interface 140 and displays it on the display 130.

The main body of the programmable controller 200 mainly includes a CPU 210, a bit operation processor (abbreviated as BP) 220, a user program memory 230, a data memory 240, an input / output unit 250, an interface 2
60.

The CPU 210 controls the entire device, for example, controls communication with the programming device 100, controls communication with the electronic device to be controlled, and controls B
The sequence program of the user program memory 230 is executed together with P220.

The BP 220 is in charge of a bit operation in the sequence program. The data memory 240 stores information signals input to and output from the control target device. This memory area is divided into a bit data storage area and a word data storage area.

The input / output unit 250 mutually converts input / output information signals into a predetermined signal format with respect to the control target device.

The bit processing for the word data according to the present invention in such a circuit will be described.

In this embodiment, a case will be described in which a specific bit in word data is specified as a contact information in a sequence program and the contact information is monitored during system operation.

(A) Creation of Sequence Program FIG. 3 shows a data format for designating a specific bit of word data. As shown in FIG. 3, the head of the identification name for specifying the word data is, for example, an identification symbol "D" used only for the word data, followed by an arbitrary three-digit data identification number.

At the end, a bit designation parameter relating to the present invention is given. Bit designation parameters are "0" to "F"
Values up to (hexadecimal) can be used. When "3" is added as shown in FIG. 3, the identifier having this parameter specifies 16-bit word data having an identifier of "D000". This means that the bit data at the fourth position from the head of the word data is selected.

An example in which such word data is used in a sequence program is shown in the upper part of FIG. In this program command, bit data (on / off data) having a data identification name of “D0003” is assigned as contact information of an input contact, and this contact information is assigned to an output coil (ID) having an identification name of “Y20”. Output contact).

The operator creates a program including such a sequence command by using the programming device 100,
The data is transferred to the programmable controller main body 200 prior to the system operation. This sequence program is shown in FIG.
Is stored in the user program memory 230 by the CPU 210.

(B) Sequence calculation processing In executing the sequence program, the CPU 2 shown in FIG.
Numeral 10 identifies the data type of the data identification name described on the sequence program by the control procedure of FIG. 5 and accesses the data (read / write processing).

When executing the sequence command shown in FIG. 4, that is, the command to read the contact of the contact "D0003", C
The PU 210 detects that the data is a word based on the first character "D" of the data identifier included in the sequence instruction (S10).

Next, since the sequence command is a contact read command, it is confirmed that data reading is instructed, and then the word data is read. More specifically, the identification information (D000) of the first to fourth digits of the data identification name (see FIG. 3) is extracted, and this “D0”
A read address to data memory 240 corresponding to "00" is set. Next, a read address and a read instruction signal are transmitted from CPU 210 to data memory 240. Data memory 240 has a storage area designated by the read address. Data corresponding to 16 bits is read from (corresponding to D000), and stored for each bit in 16 bit registers in the CPU 210 (S20 → S80).

Next, at the end of the data identifier, "0"-
After confirming that any of the parameter symbols “F” is present, the CPU 210 identifies the data position indicated by the parameter symbol in the data identification name by the control procedure of FIG.
That is, the CPU 210 performs a comparison in order from the parameter symbol ("3" in this example) and "0" (S1).
00 to S120). When a match process is found in the comparison process for “3”, it is identified that the bit position indicated by the parameter “3” is “4”, and the value of the fourth bit register is set to the value of the sequence instruction. It is selected as the value to be calculated.

In the sequence command shown in FIG. 4, a coil command is read next. In S10 of the control procedure of FIG. 5, it is determined from the data identification name “Y20” that the data handled by the read sequence instruction is bit data.
The CPU 210 transfers the bit data at the designated bit position in the word data read in the above processing to the BP 220. The BP 220 writes the bit data selected from the word data into the bit data storage area of the data memory 240 corresponding to the identification name “Y20” based on the read sequence command (S10 → S15).

The above processing is an example in which a specific bit in word data is read. If, for example, the data identification name "D0003" is assigned to the output destination of the coil command, CP
The following processing is executed in U210.

That is, the data to be handled is word data according to the data identifier in the sequence instruction.
S10 → S20 → S indicates that there is an instruction that requires a write operation to the data memory 240 as a sequence instruction.
Confirmed in the order of 30.

Next, upon detecting the presence of the bit position designation parameter in the data identification name, the CPU 210 stores one bit from the data memory 240 corresponding to the identification name (D000).
The 6-bit word data is read and stored in the internal register (S50).

Next, the position of the bit data to be processed is identified according to the control procedure of FIG. 6, and the fourth bit data is replaced with the bit data specified by the sequence command before the coil command (S60). .

Next, the word data of the internal register including the updated bit data is written into the data memory 240 again, so that the data memory 2 in the coil instruction is written.
The process of writing data to the memory 40 ends (S7).
0).

As described above, in this embodiment, when reading / writing word data from / to the data memory, the presence / absence of a parameter for designating a bit position in the identification name of this word data is checked ( S40 and S9 in FIG.
0), it is determined whether the bit value of the entire word data is to be processed or a specific bit value in the word data is to be processed. The CPU 210 at the time of performing this determination process operates as the data type identification unit of the present invention.

When the existence of the bit designation parameter is confirmed, the bit data on the bit memory 240 indicated by the bit designation parameter is accessed in S100 and S50 to S70 of FIG. The CPU 210 at the time of performing this access operates as access means of the present invention.

As described above, in the present embodiment, the identification name for the word data can be used even when the identification name for the bit data should originally be given to the input / output contact. Further, since the data having this identification name is stored in the word data storage area on the data memory 240, there is no need to change the capacity of the bit data storage area at all.

When the function of reading / writing a specific bit in word data is used, the following use forms are also conceivable. For example, when comparing a threshold value of a numerical value on a sequence program, conventionally, a sequence instruction for performing a magnitude comparison must be described. However, by extracting, for example, a specific bit of the word data, it is possible to easily compare the threshold values of numerical values without a sequence command for comparison.

For example, assuming that the word data is composed of two bits, if the most significant bit of the two-bit data is "1", the word data is "2" or "3" (both are decimal numbers). Therefore, by using the value of the most significant bit, it is possible to perform a comparison determination process as to whether the word data is “2” or more.

As described above, by using the function of the present embodiment, the comparison process can be executed without the sequence command for comparison, so that the processing steps of the sequence program can be shortened.

In addition to the present embodiment, the following example can be realized.

1) In this embodiment, an example has been shown in which a specific bit in word data is read / written (accessed) to / from the data memory 240 for a sequence operation. In addition, the data in the data memory 240 is
Since the data memory 240 is also accessed when inputting / outputting data via 0, it goes without saying that the present invention is applied to this access.

2) As another case of accessing the data memory 240, a monitor process may be executed. Also in this case, the CPU 210 reads a specific bit in the word data from the data memory 240 and transmits it to the programming device 100 side. At this time, using the comment display function of the conventional programming device 100, a special comment on the specific data extracted from the word data is displayed on the display 130 of the programming device 100 of FIG. 2 as shown in FIG. Is also possible.

In this case, a comment for the specific data is created in advance and stored in a memory (not shown) in the programming device 100 in association with the data identification name. When the monitor data is received from the programmable controller main body 200, the type identification is performed on the identification name of the data, and the CPU 110 of the programming device 100 identifies that the received data is bit data extracted from the word data. After that, based on the identification name, the comment is read out from the memory and displayed on the display 13.
Display at 0. By performing such processing, a comment can be displayed for each bit in the word data.

3) In this embodiment, the types of bit data and word data are identified by the symbols added to the head of the data. However, if the number of digits of the characters constituting the data is made different and the contents of the data type are different, The present invention can also be applied to a programmable controller that is configured to operate.

[0055]

As described above, according to the present invention, not only can the data storage memory be effectively used, but also a sequence operation processing of a sequence program, which has not been possible in the past, becomes possible. The effect is also obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a specific circuit configuration of the embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a format of a data identification name according to the present invention.

FIG. 4 is an explanatory diagram showing the correspondence between data on a sequence program and storage locations on a memory according to the present invention.

FIG. 5 is a flowchart illustrating a processing procedure executed by a CPU 210 of FIG. 2;

FIG. 6 is a flowchart illustrating a processing procedure executed by a CPU 210 of FIG. 2;

FIG. 7 is an explanatory diagram showing an example of a monitor display screen according to another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 programming device 110 CPU 130 display 200 programmable controller main body 210 CPU 220 BP 240 data memory

Claims (1)

(57) [Claims] 1. A programmable controller capable of accessing word data stored in a built-in memory by an identification name assigned to the word data, wherein a parameter format indicating a specific bit position in the word data is provided. It is determined in advance whether or not the parameter is added to the identifier, and in the case of an affirmative determination, it is determined that the data to be accessed is specific bit data in the word data. In the case of a negative determination, data type identification means for identifying that the data to be accessed is the entire word data, and when the identification result of bit data is obtained by the data type identification means, Access means for accessing the bit data in the memory at the bit position indicated by And a programmable controller.