JPS5884302A - Process controller - Google Patents

Abstract

PURPOSE:To eliminate the device phase deciding function and to simplify the structure of each controller, by giving the priority to plural controlles and stopping the transmisson of the control signals of the controllers having lower priority with the control signals of the controllers of higher priority. CONSTITUTION:The priority is given in order of controllers 103, 102 and 101. The output switches 201 and 202 of controllers 101 and 102 are controlled with the output signal 108 of the controller 103, and the output signal 107 controls the switch 201. Then the controller 103 transmits the signal 108 while either one of the controllers 101 and 102 is receiving the control signal. As a result, the output switches 201 and 202 of the controllers 101 and 102 are turned off and only the output of the controller 103 is transmitted to a controlled system 111. On the other hand, the output of the controller 101 is stopped and only the control signal 107 is applied to the controlled-system 111 when the controller 102 transmits the signal 107 while the controller 101 transmits the control signal 106.

Description

Detailed Description of the Invention In this invention, the extended process control device is also reviewed by Jll regarding improvements in the case where multiple control devices are multiplexed for one controlled object to achieve redundancy. .

The operation of the process is maintained by ensuring that all control systems are fully operational. For this reason, even if a part of the control system malfunctions, it can affect the operation of the entire process. being sought after.

In response to such demands, conventional control equipment has been installed in multiple PCIs for the control target of the roof, and a backup of double or bulk control equipment has been installed for the process control equipment 111 for lumps. Efforts are being made to prepare the system. When preparing a backup system in this manner, a situation is created in which an output signal can be arbitrarily transmitted to a control target according to the requirements of each backup control device. It is necessary to add IIIIfM to prevent the output from the other ya Mrs. 111+m devices when the device for one Booth 111+m is transmitting a control signal.

In response to such requests, the applicant company requested the
As proposed in ``Publication No. 688'', the function for determining whether or not other process control devices are transmitting output for multiple process control devices is eliminated, and only one process control device is used for process control*. *Only one could propose a space control device for nine booths using the transmitter as a field.

Figure 1 shows the technical development. 1 in the figure. OJ, IO! ! .

103t! First, second, and third process control equipment are shown. These lj41 S second and third processes ll1llI
The official instrument can be, for example, a Diseal control type controller, an analog control type WSM meter, a manual operation device, etc.

In the process control equipment proposed earlier, each of these sets 1,
The second and third process control devices are connected to each other by a system bus 304, and transmission information is mutually exchanged via the second system bus 104.
1,101! , l1flJ # * N installed in 10B
) Only one process control device has output switch 1.
13 or 114 or 111s1 turn on control signal】06
It also operates to transmit 107 or 308.

In FIG. 1, l (l is each process control device 10'
Signal conversion-111 which converts the signals 106, 107° 108 from l~103 into a process probability signal 109 of, for example, 4~10m^ indicates the controlled object. It is also a 1 12'q answer pack signal.

First proposed is a friend process control device for each process control! IQI ~ l0 JIK each judgment rr * ability must be faced, each process control equipment 101 ~ 1
There is a drawback that the structure of 0g is coarse.

SUMMARY OF THE INVENTION An object of the present invention is to provide a process control device that can determine the output signal output level with a simple structure.

In this invention, priority is given to a plurality of process control devices 16, and when a process control device with a higher priority transmits a control signal, the control signal is transmitted to the control device #a.
K11l is configured so that the switch provided on the output side of the control device with a low I11 level is set to jIwr and the transmission of the control signal is stopped.

Therefore, according to the present invention, there is no need to supply pressure to the judgment function based on the status exchange function between the *S for process control, and the structure of each process control device can be simplified.

An example of the present invention will be explained in detail below with reference to the drawings.

Figure 2 shows a complete summary of this invention. In this invention, *a process control machine a! 101゜102.10J
For example, one output of l is connected to an OR in the signal replacement (transfer) 105, and the output signal of a process control device with a high priority is used to stop the output of a control device with a low priority. be.

In the example of Jin, the first, second, and 31' process control equipment 10
As in the case of 3.102.108 in FIG. 1, 301 is, for example, a digital control type meter, 102 is an analog control type controller, and 103 is an IFi manual operation device. Such m s s 2nd and 3rd control I@6101.10
! , 1 (In this invention, priority is given to IK. It is normal to give priority to devices with high reliability. Reliability is higher as the failure rate is lower, and in general The manual operating device has a simple structure and has the highest reliability.
Next is the analog control type lI1 meter, and last is the digital control type lI1I311 meter. The priority is II3 process control equipment 103, 1K! process control equipment 302, and 7th process control equipment 101.
The order is as follows.

Therefore, in this @ Ming am18pu w-kA 餉GOYO 11
6303 (returns to the output signal 1011!6111, controls the output switch 203.202 of the second process 11JII 111F103 t10!, and outputs the output signal 107eC of the second process control machine aip102 to the first process control machine 101. It is configured to control the output switch 201.As in the case of 111dl11111, the process control target is Toshi, and 112 is an answerback signal.By configuring as described above, !D*1% second In a state where any one of process control equipment 101 and 1 (l) is transmitting a control signal, the 8th process control equipment 1
When 03 transmits the control signal 10g, the control signal 10
8 for 1st and 21st W+S control 1!11101
．． 102 output switches 201 and 201111 are controlled. Therefore, in this case, only the output of the KU third process koji making machine 51 (l) is transmitted to the controlled object 111.

-1 The first process control machine @101 is transmitting the control signal 106, and the second process control machine 9102 is transmitting the control signal 107.
The output switch 201 of *a1oi for process control is controlled by OR to stop its transmission, and the control signal 07 seconds of the second process control device 102 is given to the control target 111.

As described above, according to the present invention, since the output signal of the process control device with a high priority level is configured to stop the transmission of the control signal of the process control device with a low priority level, each process control device] 01.102.1 (each has other control functions for mutual information exchange functions)
The adjacent nine, each control 1119-303, 1 does not have a judgment function to judge whether the device is transmitting a control signal or not.
02.

The structure of 103 can be simplified. However, each control 1
iii Machine-101, 102, ]03 is installed in a convenient place, and these control machines 9101゜102 are operated by nose.
．． It is possible to simultaneously give a transmission command to 101 and completely prevent mirroring of outputs, although the structure is simple.

A specific example of the present invention is shown in Figure I3. 30 in the diagram
1.302.303 are the second and third system Nl respectively
l4i101.10j! ! , 10Jl output circuit is shown. This example shows the case of a current output type OTB power line. Output switch 201 for these output circuits 301 and 302
．． 202 first, 1i1f for lI2 process N11I#
Provide p101 and 10211C. First process 1111
The output switch 201 installed in the II device 101 is a two-person square switch, and one input terminal 306#C1j
42 for process control 41! Output terminal 3.08 of device 102
Connect. The other input terminal 307 is connected to the output terminal 311 of the third process control machine m1lli. The 27th W process koji control equipment 102 is provided with a manual output switch 202, and the 310th 7th process koji control machine 61080 control output signal 10B is provided to the manual output switch 309.

By configuring in this way, the pth control ll grinder 103
is transmitting a control signal 10g, switch clusters 312 and 3 constituting each output switch 201, 2, 02
Controlled to 3aa on. Therefore, exit car road 301 and Hiro 8
Even if 1llJ output No. 106 or 107 is sent from 02 and it becomes a big deal, 11I for the third process 111I#
When the control signal 108 of the device 10JI is multiplied, the control signal 108 turns on the switch elements 312 and 313 that constitute the output switches f201 and 202. 01 and 30
The output current of No. 2 is bypassed and transmission to the outside is stopped.

In addition, the first process control device 11101 receives the control signal 106
In state 11, which is transmitting
III for Il! 102 sends a control signal 107,
The control signal 107 causes the output switch 201 of the process control device number 101 to be shut off, and the transmission of the control signal 106 is stopped.

In the first process control device @301, the state of the output switch 201 is taken out as shown by the dotted line, and returned to the digital control device 814, which is configured by, for example, a micro combinator, and output switch When 201 is in the lIIwIr state, the microcomputer constituting this digital m-type IHI #ts s 4 can be used for purposes other than adjustment calculations, such as display or transmitting information to a higher level. It can be configured so that

As described above, according to the present invention, it is possible to determine t7R of the outputs of a plurality of Purcess-J service*a at the output section, and each device There is no need to judge whether to output or hold. Therefore, if each process koji equipment company freely expresses its intention to output a control signal, if it looks at the answer pack signal, it can find out after the fact that it has been denied. The advantage is that the output is negated and the output does not become %W14. Therefore, although it has a simple configuration, it is reliable! It is possible to obtain an intelligent professional seventh control device.

[Brief explanation of the drawing]

A friend of mine, Block Melt, proposed to IK1 and explained the nine process control equipment, lI2111 is the refreshing II of this invention.
A? 8111Fi is a continuous diagram showing an example of the wing-like contribution of the wa part of this invention. 1oJ, Joz, Ios: 1st, 2.1g5y process control equipment,!・L, 0 window: Output switch controlled by the output signal of another control device. Fang 1 Kio 2f]

Claims (1)

[Claims] (]) The outputs of several process control devices are OR-connected to form one process control operation output, and at least one of these multiple process control devices is connected to the output signal of another process control device. A process control device that is equipped with a function to stop the transmission of output numbers under certain conditions.