JPH0623922B2 - Programmable controller - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable controller, and more particularly to a programmable controller for speeding up a setting value changing process of a timer value or a counter value.

<< Prior Art and Its Problems >> As is well known, the programmable controller is to perform a desired sequence control or the like by arbitrarily associating logic between external input / output signals by a user program.

By the way, in actual operation, the set value of the timer / counter function is often readjusted.

For example, the following is known as the setting value changing process that has been conventionally performed. That is, a search program for searching the instruction to be changed from the timer / counter instructions arbitrarily stored in the user program memory is prepared as a user program, and the set value of the timer value or the counter value is changed by this. It is the one.

However, in the setting value changing process by the search program, if the user program is long or if the instruction is near the end instruction indicating the end of the user program, the search time may be long, or There is a problem that the execution cycle of the program becomes long.

«Object of the Invention» An object of the present invention is, during execution of a user program, without affecting the execution cycle of the user program,
In addition, a programmable program that can change the settings of timer values and / or counter values without being affected by the length of the user program or the setting position of timer / counter instructions.
To provide a controller.

<< Structure and Effect of the Invention >> In order to achieve the above object, the present invention searches all timer / counter instructions stored in a user program memory as an initial process prior to execution of a user program, and retrieves each timer / counter instruction. Table and means for creating a timer / counter number / address comparison table showing the correspondence between the number and the set value storage address, and the number and setting value of the timer / counter instruction to be changed during execution of the user program. Corresponding to the number of the timer / counter instruction input by the input means by an interrupt when the change instruction is input by the input means during execution of the user program. A reference to obtain the set value storage address from the comparison table created by the comparison table creating means. Means, storage means for storing the set value storage address obtained by the reference means, and change data of the set value input by the input means in association with each other, and storage means for storing the set value storage address and the set value in the storage means. When the change data is stored, a flag setting means for setting a flag, and after executing the user program, it is determined by the flag setting means whether or not the flag is set. If the flag is set, the user program memory And rewriting means for rewriting the set value data of the timer / counter instruction of the address stored in the storage means to the change data of the set value stored in the storage means corresponding to the address. And

According to this configuration, the timer / counter number / address comparison table is created in advance as an initial process prior to execution of the user program, and when a set value change command is input during execution of the user program, the comparison table is generated by an interrupt. A setting value storage address corresponding to the number of the timer / counter instruction is obtained from the address, the change data of this address and the setting value is stored in the storage means, and a flag is set.

Then, it is determined whether or not the flag is set after the execution of the user program. If the flag is set, the set value data of the timer / counter instruction at the address stored in the storage means in the user program memory is Since it is rewritten with the change data of the set value stored in the storage means corresponding to the address, it is not affected by the length of the user program or the setting position of the timer / counter instruction, and also affects the execution cycle of the user program. The setting value of the timer / counter instruction can be changed without giving.

<< Description of Embodiments >> FIG. 1 shows an embodiment of a programmable controller according to the present invention. In the figure, a programmable controller according to the present invention includes a CPU 1, a user program memory 2 in which a user program is stored, an input circuit 3 to which an external input signal is applied, an output circuit 4 for transmitting an external output signal, The input circuit 3 and the output circuit 4
Basically, an input / output memory 5 serving as a buffer memory for the input / output data corresponding to the above and a program console 6 for inputting the set value change data according to the present invention are provided.
The CPU 1 sequentially executes each instruction of the user program memory 2 at high speed on the basis of the system program stored in the ROM 7, performs arithmetic processing on the basis of the data of the input / output memory 5, and inputs the result according to the processing result. The operation of the instruction executing means for rewriting the output data of the output memory 5, the operation of the input updating means for writing the input data of the input circuit 3 in a predetermined area of the input / output memory 5, and the predetermined area of the input / output memory 5. The operation of the output renewing means for setting the data of (1) in the output circuit 4 and the operation of the set value changing process according to the present invention are performed, and the RAM 8 is used as a working memory at that time.

In the RAM 8, the set value change request flag F and the timer /
A counter number / address comparison table NAT is provided.

The program console 6 basically has a keyboard for inputting a timer / counter number and a set value and a switch for inputting a change command.

FIG. 2 is a flow chart mainly showing the part of the control operation of the CPU 1 according to the present invention, which will be described below with reference to FIG.

First, the basic operation of the programmable controller will be described. In the first step 200, a well-known initial process for setting the programmable controller to the initial state is performed before the execution of the user program. Then, in step 212, the external input signal applied to the input circuit 3 is written in a predetermined area of the input / output memory 5 (operation of the input updating means). Next, in step 213, one instruction is read from the user program memory 2, the instruction is decoded and executed in the next steps 214 and 215, and the program counter is incremented in step 216 to proceed to step 213 to read the next instruction. put out.
Thus, until the end instruction indicating the end of the user program is detected in step 214, step 2
The sequence of 13 → 214 → 215 → 216 → 213 is repeated (operation of the instruction executing means). And step 21
If an end instruction is detected in step 4, step 217
Then, the output data is set in the output circuit 4 (output updating operation).

In the programmable controller which operates as described above, the present invention provides N
The AT creation routine is executed, and the setting value change processing is performed by the routines of step 218 and thereafter.

First, the NAT creation routine will be described.

In FIG. 3, in step 300, the program counter is initialized. In step 301, one instruction is read from the user program memory 2.

In steps 302 and 303, the read instruction is decoded. As a result, if the read instruction is not the end instruction or the timer / counter instruction, the program counter is incremented (step 306) and the process proceeds to step 301 to read the next instruction. If the read instruction is a timer / counter instruction in step 303, the process proceeds to step 304, the NAT according to the present invention is created, and the program counter is incremented by 2 (steps 305, 30).
6) The next instruction is read (step 301).

FIG. 4 is a memory map 41 showing the timer / counter instruction and its setting value data extracted from the user program stored in the user program memory 2 and the user program based on such a user program in step 304. Shows the NAT created in. As is well known, the timer / counter instruction is a 2-word instruction, and
An instruction code designating a timer number counter number is set in the word, and its set value data is set in the second word. In this embodiment, the case where the timer / counter instruction 1 designating the timer / counter with the number 1 is stored in the address X and the set value data is stored in the next address is dealt with.

Therefore, in step 304, the number 0 of the timer / counter stored in the address Y is set to the start address of the NAT, and when the program counter is incremented by 1 in step 305, the address specified by the program counter is the set value. Since it is the address where the data is stored, one step is advanced in step 306. That is, in this embodiment, the address next to the address where the timer / counter number is stored is the address where the set value data is stored. In this way, the number of the timer / counter and the address where it is stored are associated with each other and stored in the NAT.

Next, FIG. 5 shows a processing routine of the changed set value data input from the program console 6 in the execution process of the user program, and in this embodiment, during the execution process of the user program in steps 213 to 216, When there is an input from the program console 6, this interrupt processing is performed immediately. That is, when the number of the timer / counter to be changed and the change data of the set value are input together with the interruption, step 5
00, the address corresponding to the timer / counter number is obtained from the NAT, and this is stored in n of the RAM 8.
Store at address. Then, the changed set value data is stored in the address m of the RAM 8 in step 502, and the set value change request flag F is set in step 503.

In FIG. 2, when the set value change request flag F is set in step 218, the contents of the nth address of the RAM 8 are read out and set in the program counter in step 219. In this embodiment, the address where the setting value data is stored is the address next to the address where the timer / counter number is stored.
In step 220, the program counter is incremented, and in step 502, the changed set value data stored in the address m of the RAM 8 is stored in the user program memory (step 221), and in step 222, the set value change request flag F is reset. Go to step 211.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a programmable controller according to the present invention, FIG. 2 is a flow chart for explaining the operation of the above-mentioned embodiment apparatus, and FIG. 3 is a timer / counter number / address according to the present invention. FIG. 4 is a flow chart showing a routine for creating a comparison table, FIG. 4 is a schematic diagram showing the relationship between the user program and the above comparison table, and FIG. 5 is a processing routine for the change data of the timer / counter number to be changed and the set value. It is a flowchart shown. 1 ... CPU 2 ... User program memory 6 ... Program console 8 ... RAM F ... Setting value change request flag NAT ... Timer / counter number / address comparison table

Claims (1)

[Claims] 1. A timer that searches all timer / counter instructions stored in a user program memory as an initial process prior to execution of a user program and indicates the correspondence between each timer / counter instruction number and its set value storage address. / Counter number / address comparison table creation means for creating a comparison table and the timer to be changed during execution of the user program /
Input means for inputting the change data of the counter instruction number and the set value and the change instruction, and the timer input by the input means by an interrupt when the change instruction is input by the input means during the execution of the user program. / Reference means for obtaining a set value storage address corresponding to the number of the counter instruction from the comparison table created by the comparison table creating means, and a set value storage address found by the reference means,
And storage means for correspondingly storing the change data of the set value input by the input means, and flag setting means for setting a flag when the set value storage address and the change data of the set value are stored in the storage means. After the execution of the user program, the flag setting means determines whether or not the flag is set. If the flag is set, the timer / counter instruction of the address stored in the storage means in the user program memory is determined. A programmable controller, comprising: a rewriting unit that rewrites the set value data to change data of the set value stored in the storage unit corresponding to the address.