JPH0782370B2 - Sequencer timer processor - Google Patents

Description

The present invention relates to a program controller, and more particularly to a timer processing device of a sequencer for controlling the system according to a predetermined program.

B. SUMMARY OF THE INVENTION The present invention is a time base register that is incremented at regular intervals, a time base register previous value table that stores previous value data of the time base register,
In a device having a timer current value table storing the current value of the time base register and a timer setting value table storing the timer setting value, the time base register is detected according to an operating condition by detecting a timer instruction in a sequence program. The address of the data of the previous value table, the timer current value table, and the timer set value table is obtained in advance, and the difference between the data of the time base register and the data of the previous value of the time base register is calculated, and the difference is calculated. In addition, the new data of the time base register is transferred to the previous value table of the time base register, and the contents of the timer current value table and the set value table are compared to perform a time-up check. Also by the timer now It is intended to obtain a timer processing unit is correctly updated.

C. Conventional Technology In order to realize the timer instruction of the sequencer, the following method has been used conventionally.

(1) Timebase interrupt method At the timebase interrupt, processing such as timer condition check, timer current value update, and time-up check is performed for all timer instructions.

(2) Time-base interrupt counting method For example, as shown in Japanese Patent Laid-Open No. 61-72304, the time-base interrupt is set to +1 and the time-base counter is set to the elapsed time at the start or end of one scan. Transfer to register and clear time base counter. Then, the timer condition is checked by a timer command, and if it is in operation, the contents of the elapsed time register are added to the timer current value to newly obtain the timer current value, and the time is checked by comparing with a predetermined value.

D. Problems to be Solved by the Invention The time base processing method of the above item (1) cannot be applied when the processing time is long and the number of timer instructions is large or the time base is short.

In the time base interrupt counting method of the item (2), the timer current value is not updated correctly when it is used twice in the timer instruction subroutine or the like. Also, if the jump instruction does not execute the timer instruction within the scan, the current timer value is not updated. As described above, the method of item (2) is not sufficient for a sequencer having instructions such as a subroutine and a jump.

E. Means and Actions for Solving Problems The present invention has been made in view of the above problems, and a time base register that is incremented at a constant cycle and a time base that stores the previous value of the time base register. In a device having a register previous value table, a time base register current value table that stores the current value of the time base register, and a timer setting value table that stores timer setting values, a timer command is detected in the sequence program. Means for obtaining the data address of the previous value table, the current timer value table, and the set value table of the time base register according to the timer instruction number according to the operating condition, and the current data value of the time base register and the time base Register Previous value table Take the difference between the data values and the previous timer The time difference data between the process and the current processing, input the time difference data to the timer current value table, add the output data of the timer current value table to the time difference data to obtain the current timer current value data, A time-up check is performed by comparing the contents of the timer present value table and the contents of the timer set value table with a means for transferring new data of the time base register to the previous value table of the time base register based on the present value data. And means for doing so.

F. Example An example of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram of the timer processing data in the timer processing device of the sequencer according to this embodiment. FIG. 1 (A) is a time base register which is incremented at a constant cycle, and FIGS. 1 (B) to 1 ( D) is a table arranged in the order of timer instructions and is placed in the memory. Fig. 1 (A)
The time base register 1, the time base register of FIG. 1 (B), the previous value table 2 and the timer present value table 3 of FIG. 1 (C) are cleared to, for example, “0” when the power is turned on, and set up by this . Time base register previous value table 2 and timer current value table 3
Have corresponding columns To to Tn, and the timer setting table 4 in FIG.
With Tn.

When the timer instruction is detected in the sequence program, the operating condition is checked. If the operating condition is satisfied, the time base register corresponding to the timer instruction number previous value table 2,
Timer current value table 3 and timer set value table 4
Of the data of the time base register 1 and the data (content) of the time base register 1 and the previous value table 2 of the time base register 1 and the difference is added to the timer current value table 3 of the time base register 1 The data is transferred to the time base register previous value table 2.

Next, a time-up check is performed by comparing the contents of the timer present value table 3 and the timer setting value table 4. By taking the difference between the contents of register 1 and the contents of table 2,
You can see the elapsed time from when the last timer instruction was executed. A new timer current value can be obtained by adding this elapsed time to the timer current value table 3.

Also, the contents of the time base register 1 are transferred to the time base previous value table 2, and the value of the time base register 1 is held until the next time when this timer instruction is executed. By comparing the contents of the timer present value table 3 and the contents of the timer setting value table 4, it is judged whether or not the time is up.

Further, by providing the previous value table, since each timer operand has the previous value, accurate time measurement is possible no matter how many times the timer instruction of the same operand is executed.

More specifically, as shown in FIG. 3, first, the data d _{1 of the} register 1 is guided to the time base previous value table 2. Timebase previous value table 2 holds the data d _1, and outputs a previous input data d ₂ from the time base register 1 when the data d ₁ is input. Data takes the difference between the output data d ₂ of the data d ₁ and the time base register immediately preceding value table 2 from the time base register 1
d ₃ is obtained. The data d ₃ is the time difference between the previous processing and this processing, and the elapsed time from when the previous timer instruction was executed until now is known. Timer current value table 3 outputs the data d ₄ as input data d _3. The output data d ₄ of the timer current value table 3 is true of the timer current value data d ₅ at the current time in addition to the data d ₃ is obtained. Based on this timer current value data d ₅ , the time base register 1 transfers new data d _1a to the time base previous value table 2.

FIG. 2 is a flow chart showing the operation of the on-delay timer. When the on-delay timer is started in step S ₁ , the time base register 1 is set as shown in step S _2.
Is saved. When the time base register 1 is saved, the timer determines whether or not the operation in step S _3. If the timer is not running, move to step S ₄ ,
The current timer value is set to "0",
Time up output as shown in S ₅ is also set to "0". When the time-up output is set, the contents of register 1 as step S ₆ is set to the previous value, step
The operation is completed as shown in S ₇ .

If during the timer operation in step S _3, Step S ₈
If the time is up, go to step S ₆ . Further, if not in time-up timer is running last time value determines whether or not "1", "1" unless the current value as shown in step S ₁₀ is the greater or not than the set value to decide. In step S _10, the process proceeds to step S ₆ to be greater than the current value setting. Further, the current value is greater than the set value, set the time-up output to "1" in step S _11, and then proceeds to step S _6. Next, step if the timer is in operation and the timer is running the previous value in step S ₉ is "1"
Proceeds to S _12, the process proceeds to step S ₁₀ to update the timer current value.

According to the timer processing device of the above sequencer, the increment may be performed by hardware or may be performed by software processing by time base interruption. Even if the same timer instruction is used more than once in one scan, the timer operates correctly even if the timer instruction is not used in a certain scan due to a jump or the like. Furthermore, it is possible to easily realize timer instructions having different time base update cycles. That is, for example, the time base is 1 (msec) and 100 (mse
In order to use the two types of c), prepare two types of time base registers and set timer instructions for 1 (msec) and 100 (mse).
Distinguish according to c). The 1 (msec) instruction uses the 1 msec time base register for processing. The processing method is exactly the same. If the data length of the timer base register 1, time base register previous value table 2, timer current value table 3 and timer set value table 4 shown in FIG. 1 is set to 16 bits, the data length of the time base register 1 and the time In the base register previous value table 2 data length difference calculation
Even with a 1msec timer command, no error occurs up to 65.535 seconds. That is, the timer works correctly as long as you use the same timer instruction within 65.535 seconds. If this is advanced, a timer with a time base of 10 (msec) can be realized.

G. Effect of the Invention The present invention is as described above, and by taking the difference between the contents of the time base register and the contents of the previous value table,
Since the elapsed time from when the last timer instruction was executed to now is known, and a new timer current value can be obtained by adding this elapsed time to the current value table, it will operate correctly even if there is a subroutine or champ instruction, By having a plurality of time bases, it is possible to obtain an excellent timer processing device that can realize a high-speed timer and a low-speed timer.

[Brief description of drawings]

FIGS. 1 (A) to (D) are timer processing data configuration diagrams, and FIG.
FIG. 3 is an operation flowchart of the on-delay timer, and FIG. 3 is a block diagram showing a data transfer relationship of the timer processing device. 1 ... time base register, 2 ... time base register previous value table, 3 timer current value table, 4 timer set value table.

Claims (1)

[Claims] 1. A time base register that is incremented in a fixed cycle, a time base register previous value table that stores the previous value of the time base register, and a time base register current value table that stores the current value of the time base register. And a timer setting value table in which timer setting values are stored, a timer instruction is detected in a sequence program, and the time base register previous value table and the timer current value are detected according to the timer instruction number according to the operating condition. A means for obtaining the data address of the value table and the set value table, and the difference between the current data value of the time base register and the previous value table data value of the time base register, and the time difference data between the previous timer processing and the current processing. Get the time difference data of the timer now Input to a table, output data of the timer current value table is added to the time difference data to obtain timer current value data at the present time, and new data of the time base register is added to the time base based on the current value data. A timer processing device for a sequencer, comprising: means for transferring to a register previous value table and means for comparing the contents of the timer current value table and the contents of the timer set value table to check the time-up.