JPS60207912A - Driving device of setter - Google Patents

Abstract

PURPOSE:To improve following properties by calculating a setter driving time on the basis of a real value of a driven setter speed obtained at the preceding sample in case of the 2nd sample or after. CONSTITUTION:In the 1st sample, the setter can be driven by only a half of a planned curve A because there are no data for the real driven setter speed. In the 2nd sample however, the lack of the driven variable at the 1st sample is also precisely compensated by using the data of the real driven setter speed measured at the 1st sample to driven a setter 21 up to a position coinciding with the planned curve A. In the 3rd sample or after also, the setter 21 is driven while considering the real value of the driven setter speed may be shifted from a specification value. Therefore, a driving curve C is formed along the planned curve A. Thus, the following property can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] This invention relates to a setting device for a process controller that is often used in the field of process control of plants.

[Technical background of the invention and its problems 9 In plants, chemical plants, etc., temperature, pressure,
There are many controllers that control process variables such as flow rates. Is this controller equipped with a crotch device? ) When the can control scale value is set on the setting device, control is performed as follows.

In some cases, the target amount is set for the alarm system by an operator, and in other cases, it is driven by the overall monitoring control device 17 that controls the entire plant.

In any case, it is necessary for such an i&52 device to be driven at a constant rate of change in Ht at a predetermined timing within the complex interrelationships throughout the plant.

First, assume the following case. When a drive signal is given to the setting device, the driven speed at which the crotch moves is 10
Assume that the specification is 0%/order.

The control sampling period of the setting device driving device that drives the setting device is assumed to be 6 seconds. Then, by intermittently driving the setter at each sampling period, when trying to increase the setting f111 at the be.

In this case, if the driven speed of the installed device is as specified, 10
For 0chi/-, the relationship between the position of the setter and time is shown in FIG.

Next, let us consider a case where the setter driven speed is actually less than 50 cm due to five reasons such as deterioration of the rod.

In this case, the conventional setting device driving device operates as follows.

The target drive amount for the first sample is given by equation (1).

(0 insertion drive amount) = (target set value change rate) x (sampling period) = -! −%/ see X 6 sec =
1%6 (1) The setter drive time for the first sample is given by equation (2).

In equation (2), the true setter driven speed is 50 chi/M
The drive system is not given a true general driven speed and is not given a specification of 100%/home.

Next, the target drive piece for the second sample is given by formula (81).

(Target drive valve) = (Target W unit value for 2nd sample) -
L (equipped with the setting of the lth sample W, ) = 2% - 05% =
15%...(8) The setter driving time for the second sample is given by equation (2) as in the first sample.

By the way, in the case of the conventional crocodile excitation device, even after the second sample, the specification value of 100%/adjustment is still used as the setter driven speed.
Therefore, the 10th standby drive time for 2 samples is also the same as the target drive m ftk even in the 2nd sample.
15%, the actual W device drive amount is 5(inch/m)
XQ, 9 sec = n%haec x Q, 9
sec == only 0.75%.

From now on, calculate in the same way for the third and subsequent calculations,
When the actual setter driven speed is 50% of the specified setter driven speed of 100/-, the setter position time when driven by a conventional setter drive device is as follows: The relationship is represented by the dashed line B in FIG. Comparing the solid line A and the broken line B, we can see that in the case of the broken line B, the IT setter position changes with a delay of about 1 sample (or with an offset of 1 sample) compared to the solid line A. I know I'm going.

``Objectives of the Invention'' An object of the present invention is to solve the above-mentioned inconveniences in control, and to provide a setter driving time with good followability.

[Kiri, J & of the Invention] In order to achieve the above object, in the setter drive time of the present invention, from the second sample onwards, the actual value of the setter driven speed in the previous sample is used. This is an attempt to control the setter driving time.

[Embodiments of the invention] An embodiment of the structure of the present invention will be explained on page 6 with reference to FIG.

Reference numeral 1 denotes a setting device driving device of the present invention, which controls the plant in an appropriate manner at the appropriate timing for the control device 2 in order to comprehensively monitor the plant process 3 and control it appropriately. Therefore, the control commands such as control target values are defined in terms of older brother. Such control algorithms and various constants necessary for control are stored in the device 12. The judgment processing device board 11 reads the control algorithm etc. from the sujiki 1M drinking device 12, reads the plant process e from the plant process 3 via the input device 13, and performs the control. According to the algorithm, necessary control 1 commands such as control target values are outputted to the setter 21 of the 11114 device 2 via the output device 14. Also, the result of outputting this control command to drive the setting device 21.

The way the setter 21 moves is read through the input device r*+3, and based on the result, 3A necessary modifications are made to the control algorithm. The control device 2 includes a setting device 21 and a controller 22. As described above, the setter 21ij is driven by the setter drive device l to output an appropriate set value, and the controller 21ij is driven to output an appropriate setting value.
2 actually outputs a control output to the plant process based on the set value set in the setting 521.

Next, the functions of the present invention will be explained according to the flowcharts shown in FIGS. 3A and 3H.

First, when the device 1 of the setting unit 6 is started, the control device 2
Determine whether it is time to output a control command to (4)
1). If Nδ is the sampling delay (51)
Return to afterword■. If Yl, the setter 21V determines whether the final target level has been reached (42). Therefore, if it is Yl8, turn on ■ and return to ■ again after a sampling delay (51). If it is N6, the sampling target value of the setter 21 is calculated (43). Next, the current drive amount is calculated from this sampling target value and the current value of the setting device (44)
. Here, it is determined whether or not there is data indicating a false driving speed when this setting device 21 was previously driven (45). If there is no data, use the specification value stored in memory device #12E in advance as the setter driven speed.47)
, if there is data (Yl8), as the setter driven speed,
Use previous data (46). In any case, the driving time is determined by the setter drive unit and the setter driven speed (48), and the Mj regulator 21 is driven for that time (
49). Then, the driving speed when the setting device 21 is operated this time is calculated, the result is stored in the storage device (50), and the process returns to step (2) via the sampling delay (51).

[Effects of the Invention] As described above, the setter drive device of the present invention allows the driven speed specification value 100%/jIliIl actual division value 50chi/
FIG. 1 shows the time course of the setter position when an attempt is made to drive the setter at a rate of change of 1%/sampling cycle with a sampling period of 6 seconds by one point IA-C. That is, in the first sample, since there is no data on the true setter driven speed yet, the setter drives only half of the planned curve A, like the conventional setter drive device. However, in the second sample, according to the setting device driving device of the present invention, data of the true setting device driven speed actually measured in the first sample is used to determine the peg. In order to compensate for the difference, drive the setter 21 until it matches the it 1IIn curve A, and thereafter perform driving taking into account that the actual value of the setter @ drive speed deviates from the specification. , the driving curve C is along the planning curve A, and compared with the ijA-axis curve B produced by the conventional setter driving device, it clearly has the effect of improving controllability.

Furthermore, although the present invention has been described as a setting device driving device, the object to be driven is not necessarily limited to the setting device.

The method of the present invention is also suitable for directly driving control valves, etc.
1 is applicable.

[Brief explanation of the drawing]

Figure 1 is a graph showing the relationship between the position of the setting device and time.
FIG. 2 is a block diagram showing an embodiment of the setting device driving device according to the present invention, and FIG. 2 is a chart 70 for explaining the operation of the setting device driving device shown in FIG. 2. 1...tbr constant drive device age 2...control device 3...
・Plant process 11... Judgment processing equipment 12...
-Storage device 13...Input device 14...Output device 1
21...Set 5? Device 22... Controller agent Patent attorney Noriyuki Chika (and 1 other person) No. 11!
1 8% PJIt, set Figure 2

Claims (1)

[Claims] 111j In the setting device driving device that outputs the upper signal and the lower signal to the setting device to drive the setter pond, from the ratio of the drive signal output time and the drive amount in the previous same sampling, Each time, the circuit includes a circuit that calculates the driven speed of the setter in total, and a circuit that calculates the drive signal output time in order to obtain a constant driving amount based on the calculated driven speed. q! to drive the device at a certain rate of change based on the output of the M1+ circuit. Setting device drive device for f-detection.