JPS58127201A - Indicating controller - Google Patents

Abstract

PURPOSE:To prevent incovenience to a process due to a rapid restoration not suitable to a process state when a variable to be controlled out of a pattern control of the variable to be controlled is restored. CONSTITUTION:In case of the temperature control of a furnace, an analog input section 1 inputs the measuring value of an analog furnace temperature as a variable to be controlled PV, converts the value into a digital quantity and inputs to an operation section 2. A memory 3 is stored with a program pattern designated to a set value to control the furnace temperature in response to time in addition to a program data representing the operation procedure. If the control is interrupted by a power failure and the pattern control is restarted, an optimum rate of change for the restoration of the dropped furnace temperature to an objective set value is selected from the memory 3, and the program pattern designating the set value increasing with the optimum rate of change from a variable to be controlled PV1 at that time to an objective SP1 such as line A is generated at the operation of the operation section 2 and this is given to a control section 4 for manipulated variable. Based on this signal, a manipulated variable MV is outputted to a furnace temperature control section.

Description

[Detailed Description of the Invention] The present invention is a digital system with a program transmitter.
This is 10 regarding controllers.

For example, in a chemical factory, in the 0114611 factory, inside the furnace
In automatic process control,
In recent years, digital adjustment needles have been widely used in combination with a program transmitter that is stored in advance according to the time and outputs a predetermined set value according to a good product pattern.

111th, tO151k1mftAAIyt)-14
shows. In the same figure, when controlling the temperature inside the furnace, the actual value is set value III' by ml tsuumpa I:/IIC.
The dashed line indicates the controlled variable Pv1, which in this case indicates the furnace temperature.

By the way, it would be good if this kind of program control could be continued until the end of the process, but even if the power supply to the electric furnace stops due to a power outage, as shown in Due to the occurrence of an accident, etc.), the furnace temperature, which had been maintained at a constant temperature according to the soaking segment ■, deviates from the set value and drops, and the program slams into the large pot.
There are times when I feel like I've deviated. In such a case, if you resume operation according to the original program button,
Since the difference between the controlled amount PVs and the set value 8Pt is extremely large, the furnace temperature tends to rise rapidly.

However, depending on the nature of the process, for example, if the heating rate f changes, MiIIt of the object to be treated may be assimilated, and the original purpose may not be achieved.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to deviate from the control of the controlled quantity OA and restore the controlled quantity to KIIL,
It is an object of the present invention to provide an adjustment needle capable of preventing inconveniences caused to the process due to sudden reversal that does not match.

In order to achieve such an objective, the present invention memorizes in advance a rate of change suitable for achieving each set value, and when restarting operation 11, the rate of change is calculated from the value of the controlled variable at that time. Specify the set value that changes with the tooth # change rate in the target set value range as the cut-off section, and perform the slam control again.
In order to return to the program pattern, we incorporated the 171211 function that generates another program button at every step in the program and inserts K1m into the original program button. , the controlled quantity is adapted to the current program shape 111 and returned to the original slam control MIKml with a rate of change of 9.

! @3 is a diagram showing the configuration of the present invention 0-@Example. In the figure, 1 indicates an analog input section, 2Fi calculation section, and 1 indicates a 4-wire operation amount output. Now, if you want to control the temperature of the furnace, 1ml of analog input is:
The measured value of the furnace temperature 0 of the annealing quantity is converted into a controlled quantity pv by λ, which is converted into a digital quantity and input to the calculation 112.

Memory 3 contains program data 041 that indicates the calculation request.
At 11 a.m., depending on the signal number at the time, anarchists were dispatched.
It must be from 0 manual power from 1 and the setting value input from memory 3! A manipulated variable is calculated and transmitted to the manipulated variable output section 4.

This manipulated variable signal is converted into an analog lid in the manipulated variable output section 4, and is output as the manipulated variable MY to the furnace, which is a controlled system.

Here, the rate of change suitable for achieving each target value is stored in advance in the memory 3.
At the same time, when restarting nine-bang control after being interrupted due to a power outage on the program, select the rate of change that is optimal for returning the decreased furnace temperature to the target set value, and select the fourth rate of change.
As shown in the figure, a set value that increases at the optimum rate of change from the value PVt of the controlled variable at that time to the target set value SPs is specified, and a program button as shown by the 91-dot chain line ■ is generated to give priority. apply to As a result, the furnace temperature follows the above program button and returns to the target value at a rate of increase that is appropriate for the process state at that time. This can prevent inconveniences such as the composition becoming bulky.

In addition, in cases such as when the power outage period is long, as mentioned above, if the amount of heat necessary for the entire process is insufficient by simply returning to the original programmer button, the amount of heat required for the entire process is insufficient, as shown in Fig. 4 An effective method is to generate a program button as shown by the dotted chain line @, apply it preferentially, and compensate for the shortfall.

It should be noted that, although the above explanation has been made by taking only the case of temperature control of the WA#i furnace as an example, the present invention is not limited thereto, and can of course be applied to other 01$1114+ systems.

As explained above, the present invention is capable of restoring a controlled quantity that has deviated from slam control, and is capable of controlling the IO change rate to a value suitable for the process, thereby avoiding the inconvenience caused by a sudden return. This has an excellent effect.

[Brief explanation of the drawing]

In Fig. 1, turtle 210 is a diagram showing an example of the program button O-, Figure 3 is a plotter diagram showing the configuration of the wA〇-lol example of the invention, and Figure j14 is a diagram for explaining the effect of the Ij110 of the invention. The program pattern is ylcl. 1...Analog input section, 2...Calculation section, 3...
・・Memory, 4e**・Manipulated amount output section. Drawing 6') t'7zeta (No change in 6) Figure 1 Figure 2 - Figure 3 V Figure 4 41 Commissioner of the Japan Patent Office 58.3. -91
, Indication of the case 1932 Patent Application No. 15892z 2, Name of the invention 'Hit 3, Person making supplement + E Relationship with the case Patent applicant name (name)
(GG6) Yamatake Honeywell Co., Ltd. γ Contents of the supplement (1) Engraving of specification (no change in content) ξ Engraving of phantom drawings (no change in content)

Claims (1)

[Claims] The controllable amount is determined by specifying the IlO set value according to the time, and receiving the controlled amount signal at the specified point in time input from the time signal and the controlled amount signal inputted from the controlled system. By memorizing the set value and the O rate in advance, if an accident occurs in which the controlled variable deviates from the pern system, select the rate of change corresponding to the 1IllI set value, and then re-select the rate of change at one point. From the value of the first controlled amount, estimate the row set value that will change at the current shears change rate at the first standard set value t, and adjust the needle with a bang.