JPH0693206B2 - Loader command processor - Google Patents

Description

The present invention relates to a loader command processing device.

[Prior Art] Generally, as an example of a process executed by a programmable controller or the like, a sequence calculation process, an I / O input / output process for reading / writing input / output data, and a process according to a request from a loader are performed. 3 of loader command processing to be performed
There is a process for serially performing these processes.

FIG. 7 is a time chart showing the above-described processing in time series. In FIG. 7, 1 is a sequence operation, 2 is an I / O input / output, and 3 is a loader command processing. The processing consisting of 1 unit, 1 unit, 2 unit and 3 unit is defined as 1 scan, and the time is defined as the scan time.

For example, programmable controller (hereinafter referred to as PC)
In the program execution of, the sequence operation 1 and
I / O input / output 2 configures one scan, and a PC
When a processing request is received from the CPU loader, loader command processing 3 is generated to create response data for the request. The loader command processing 3 takes various times. However, in the case of a command that requires a long time for the processing, if the processing is performed once, only the scan including the loader command processing 3 takes a lot of time. However, since the input / output data is not updated during that time, the responsiveness of the input / output data is deteriorated, and it is unsuitable to apply such processing to the control system.

Therefore, in this type of conventional processing, the loader command processing 3 is divided into a plurality of times, a certain limit is set for the processing time of one time, and each processing of the plurality of times of processing is performed by the sequence operations 1 and I. Sequence operation 1 and I / O can be performed by configuring each time after processing of / O input / output 2
A method of reducing the influence on the processing of the input / output 2 and creating response data of the loader command processing by a plurality of scans has been used.

[Problems to be Solved by the Invention] However, the time required for the sequence operation processing is generally long and short. Therefore, if the loader command processing time is fixed as described above and the loader command is processed in multiple times, As shown in FIG. 8, when the processing time of the sequence operation 1 is long, one scan time becomes long, so that there is a problem that it takes a lot of time to create the response data for the loader command.

On the contrary, as shown in FIG. 9, when the processing time of the sequence operation 1 is short, the loader command processing time is fixed and the ratio of the loader command processing time in one scan time becomes relatively high. High-speed processing is performed in scans without command processing, which results in significantly longer scan time and lower input / output responsiveness in scans with loader command processing, even though high-speed control of a PC or the like is performed. There is also a problem that the control state of the PC and the like becomes uneven.

Therefore, the object of the present invention is to solve the above-mentioned conventional problems and to make the loader command processing time variable according to the length of the sequence operation time, thereby speeding up the creation of response data. Another object of the present invention is to provide a loader command processing device that can achieve good input / output responsiveness.

[Means for Solving Problems] Therefore, in the present invention, the sequencer operation time is detected in a loader command processing device that performs loader command processing serially and in parallel with execution of sequence operation and input / output processing. A detection unit 101; a storage unit 102 for storing load count data obtained by dividing the loader command processing so that the loader command processing count increases as the sequence calculation time lengthens corresponding to the sequence calculation time; Based on the sequence operation time detected by the means 101, the division number data of the loader command processing is read with reference to the storage means 102, and the division number data is defined as the number of times of the loader command processing. , Loader command processing based on the number of times specified by the number-of-times defining means 103 And a process interrupting unit 104 for interrupting the process.

[Operation] According to the above configuration, when the sequence operation time is short, the loader command processing time in one scan is short, and when the sequence operation time is long, the loader command processing in one scan is performed. Time will increase.

[Examples] Hereinafter, the present invention will be described in detail based on examples shown in the drawings.

FIG. 2 is a system block diagram of a PC to which the present invention is applied. In FIG. 2, 13 is a sequence program memory for storing a program related to a sequence operation, circuit information described later in FIG. 4, and 14 is a sequence program memory. A division number table for storing the number of divisions of loader command processing, which will be described later with reference to FIG. 5, is an input / output interface used for exchanging input / output data with a control target or the like. Reference numeral 12 denotes a system program memory which stores the loader command processing procedure detailed in FIG. 3, the processing procedure shown in FIG. 5B, and the control program of the system having the configuration shown in FIG. 11 is a CP that executes the programs and processes described above
U is a U, to which a loader 17 for programming and monitoring and generating various commands can be coupled. 16 is a bus line that connects the respective units 11 to 15.

An example of loader command processing based on the above-described configuration will be described with reference to FIGS. 3 and 4.

Here, FIG. 3 shows a specific example of the loader command processing, and is a flow chart of the circuit reading processing for reading the circuit information of the device coupled to the PC shown in FIG. 2, for example. FIG. 4 shows the contents stored in the sequence program memory 13,
That is, the circuit information (which is represented by a ladder diagram in the figure) of a circuit in which a set of contacts and coils related to the sequence program are connected is one circuit, and a set of these circuits is arbitrarily set by the user as a page. It is explanatory drawing which shows the page command information which can be designated. Here, since one circuit information and one page information are recognized by a circuit number and a page number, respectively, when one circuit is designated and read, a search is performed using these page number and circuit number.

In FIG. 3, when a circuit to be read is designated by the loader 17, first, in step S31, the page to which the circuit to be read belongs is searched by that number (page search processing). Next, in step S32, the loader command processing is divided corresponding to the sequence calculation time as described later, and the number of times of one scan out of the number of times of processing determined by referring to the table shown in FIG. 5 ends. Judge whether or not.
If the determination is affirmative, the loader command processing is interrupted and the next sequence operation is performed. If negative, step S33
Go to, determine if the page search process is complete,
If a negative determination is made, the process returns to step S31 and the above-described processing is repeated.

If it is determined in step S33 that the page search process is completed, the process proceeds to the next step, and steps S34 to S36 are performed.
Then, in steps S37 to S39, the circuit number search process and the circuit read process are sequentially performed in substantially the same manner as in steps S31 to S33 related to the page search process.

In the circuit reading process step of step S37, the state of the retrieved circuit, that is, the on / off state of the contacts included in the circuit is read. As a result, it is possible to display on the display device of the loader 17, for example.

The series of processes described above is a process in which the loader command process, which is composed of three processes, a page search process, a circuit number search process, and a circuit read process, is divided into a number of times according to the sequence operation time, and the process is performed. , When the circuit information is read 8 times, the total number of times of the above 3 processes is 24.
If this is divided into four times and is performed four times, the number of division processes in one scan is six times. Therefore, in the first scan, the page search process is performed six times as the loader command process, the number of division processes of one scan is completed, and the process proceeds to the next scan. In the next scan, after a series of sequence calculation and input / output processing are completed, as the loader command processing, page search processing is performed twice and circuit number search is performed four times, and the process proceeds to the next scan. Hereinafter, the processing is sequentially performed according to the procedure shown in the third time.

Next, an example of how to determine the number of times of division processing according to the sequence calculation time as described above will be described with reference to FIGS. 5 (A) and 5 (B).

If the loader command processing time for one scan does not affect the sequence calculation time, it is assumed that the time is 10% of the scan time, and the division processing time corresponding to the scan time is calculated in advance. That is, data indicating how many times the page search process, the circuit number search process, or the circuit read process can be performed is stored in a table having a sequence operation time formed by, for example, 2-byte data as an index.

FIG. 5 (A) shows the table, where M corresponds to the index of the sequence operation time and the division processing number data, and is a parameter for determining the division processing number. Further, FIG. 5B shows a processing procedure for determining the number of division processings according to the scan time. This procedure may be started at the end of one sequence calculation, or may be started periodically.

In FIG. 5B, first, in step S20, the initial value of the parameter M described above is set to "0". Next step
In step S21, the above-mentioned scan time data formed of 2 bytes is read, and in step S22, it is determined whether or not all the bits of the upper byte are "0". If an affirmative determination is made here, the process proceeds to step S23 and the value of the parameter M is incremented by "1". Next, in step S24, it is determined whether or not the most significant bit of the lower byte of the two bytes is "1". If the determination is negative, the process proceeds to step S25 and the lower byte is shifted left by one. Next, in step S26, it is determined whether or not the value of the parameter M is "9", and if the determination is negative, the process returns to step S23 and the procedure following step S23 is repeated.

If the determination is negative in step S22, the determination is positive in step S24, and the determination is positive in step S26, then step S22
Proceed to step 27 and set the division processing number data based on the value of the parameter M.

As is clear from the above description, the number of division processes in one scan of the loader command process changes according to the change in scan time.

FIG. 6 shows a time chart of the scan time according to the embodiment of the present invention.

The number of scans until the end of the loader command processing is determined by the sequence calculation time as described above. Here, the sequence calculation time will be described based on the case of FIG. Is 1/2 of the case of FIG. 6 (A) as in the case of FIG. 6 (B),
Since the number of times of division processing for one scan of the loader command is half that in the case of FIG. 9A, the number of times of scanning until the end of the loader command processing is twice that.

Further, when the sequence operation time is twice as long as in the case of FIG. 6 (A) as shown in FIG. 6 (C), the number of division processes of one scan of the loader command is twice as much, so that the loader command process ends. The number of scans to do is half that.

Therefore, when the sequence calculation time is short, the relative loader command processing time in one scan is also shortened, the change amount of the scan time due to the presence or absence of the loader command processing in one scan is reduced, and the influence on the sequence calculation is reduced. is doing.

If the sequence calculation time is long, the loader command processing time in one scan is lengthened and the processing end E
By decreasing the number of scans up to, the time until the loader command processing end E is shortened. As a result, the time until the end of the loader command processing is averaged when the sequence calculation time is long and when it is short.

EFFECTS OF THE INVENTION As is clear from the above description, when the sequence operation time is short, the loader command processing time during one scan is short, and when the sequence operation time is long,
The loader command processing time during one scan becomes long.
This reduces the influence of the loader command processing on the scan time when the sequence calculation time is short,
The effect of not impairing the responsiveness in controlling the PC and the like was obtained.

Further, when the sequence calculation time is long, the time until the loader command processing is completed is shortened, and the processing time is averaged regardless of the time required for the loader command processing due to the length of the sequence calculation time. Was given.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of the present invention, FIG. 2 is a system block diagram showing an embodiment of the present invention, and FIG. 3 is a flowchart showing an example of a circuit read processing procedure according to the embodiment shown in FIG. 4, FIG. 4 is an explanatory diagram of circuit information used for the circuit reading process shown in FIG. 3, FIG. 5 (A) is an explanatory diagram of a division processing number table according to one embodiment of the present invention, and FIG. (B) is a flow chart of one embodiment for setting the number of division processes, FIGS. 6 (A), (B) and (C) are time charts for explaining the effect of one embodiment of the present invention, FIG. 7, FIG. 8 and FIG. 9 are time charts for explaining loader command processing by the conventional device. 1 ... Sequence operation unit, 2 ... I / O input / output unit, 3 ... Loader command processing unit, 11 ... CPU, 12 ... System program memory, 13 ... Sequence program memory, 14 ... Dividing process count Table, 15 …… input / output interface, 16 …… data bus, 17 …… loader.

Claims (1)

[Claims] 1. A loader command processing device for performing loader command processing serially and in sequence with execution of sequence operation and input / output processing, and detecting means for detecting the sequence operation time and corresponding sequence operation time. Based on the sequence calculation time detected by the detection unit, the storage unit stores division number data obtained by dividing the loader command process so that the number of loader command processes increases as the sequence calculation time increases. The number-of-divisions data of the loader command processing is read out by referring to the storage means, the number-of-times defining means for defining the number-of-divisions data as the number of times of the loader command processing, and the loader command processing based on the number of times defined by the number-of-times defining means And a process interruption means for interrupting Loader command processing unit.