JPS60207903A - Backup system of digital controller - Google Patents

Abstract

PURPOSE:To improve the reliability of a system by forming an abnormality diagnozing function on a digital controller side and connecting a C/L change- over switch to be forcedly switched to a backup apparatus side. CONSTITUTION:At the abnormality of the digital controller, an abnormal function signal S1 is outputted from any one of an abnormality monitoring circuit 104 and an output port 105. Since the backup apparatus 3 side receiving the signal S1 lights up an abnormality display lamp 114, the abnormality of the controller 1 side can be easily detected. The signal S1 is applied to a C/L change- over switch 32 through an OR gate 111 of the apparatus 3 side, the apparatus 3 side is forcedly switched to the L mode side. Consequently, an operation end can be prevented from sudden change due to operator's malfunction. Thus, the reliability of the system can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to back-up systems for digital controllers that are commonly used in systems such as process instrumentation systems, and in particular for bumpless switching and control. ] 4-7il-Reliable Detection-4-Regarding a backup system for a digital controller.

[Technical power purchase of invention]

FIG. 1 is a four-component diagram of this type of system.

This system consists of a digital controller J and a backup instrument 3, and the digital controller 1 receives the process K Pl (under y, referred to as process measurement value) from the sensor 4, and converts this process measurement value and target value. The operation output value is determined so that the deviation between the two values becomes zero, and the operation end 5 is set to 111I based on this operation output 1 shift.
I control it.

1!1 To be more specific, the central yL arithmetic processing unit 1 (hereinafter referred to as CPU) processes the process measurement value detected by the sensor and digitized by the A/Di'' conversion circuit 12 and the RAM ( Compare the target value stored in Random Access Memory (Random Access Memory) No. 3, and calculate the deviation from the Alcohol Rhythm (for example, is P I
D fri control algorithm)
Thus, the bond containing the manipulated output value, D/A'2 + voice circuit J
Backup instrument 3 via 5 and hold amplifier 16
sending it to the side. Also, between the D/Af switching circuit 15 and the hold amplifier 16, AIII! A/14 to select whether to tilt on the I (automatic 1!ll) or M side (manual 1H11)
A switch 18 and a C/I that switches to the CIJllI or L side in response to the center (controller side) C or local L mode switching signal from the backup instrument 3;
A changeover switch 19 is inserted in series. 2o is a manual operation part for up/down on the controller side, and when the A/lff1 changeover switch 18 is connected to M1il11, the manual operation I trowel operation output) 1b is set to Iμ.
It has a function that can increase or decrease the contact. No. 2 is a human power port.

On the other hand, the backup instrument 3 is +11176, which is slightly larger than the digital controller J, and is installed at the site. There is a C/L cut-off J'A switch 32 which selects the C side or L side by the number n. The output end of the instrument controller 4;
This L11 of the C/L cut-off switch 32 is an up-town switch on the backup side that can output 1 (1) by direct manual 1φ operation at the site (local) etc.
Operation ill 33 continues. Furthermore, the OJ dynamic terminal rectangle 1ζ of the C/L changeover switch 32 is connected to the hold amplifier 3.
4 is applied AtC, and the hold amplifier 34 outputs an operation output value for operating the operation end.

Next, the bumpless switching operation of the system as described above will be described. In the system state shown in Figure IA1, the digital controller 1 is in A mode, while the backup and 3F unit 3 side is in C mode. In this state Qlf, when the digital controller 1 switches from the A mode to the M mode using the A/M changeover switch 17, that is, from A11l to the M side contact, the manipulated output value of the digital controller 1 has already been held in the hold amplifier 16. Because of this, it is possible to switch between bumpless Yuuko and Koko.

After switching to M mode in digital controller 1,
Manual operation for controller side up/down t'A2o+
This increases or decreases the operation output value, but at this time, the CPU II detects the mode switching signal output from the A/M mode switching section 17 via the input port 21, so it switches from M mode to A mode. The output of the hold amplifier 34 on the backup instrument 3 side is read back in preparation for bumpless switching when the D/A conversion circuit 1
We are supplying 5j. In other words, in the M mode, the digital controller 1 side receives the output of the hold amplifier 34 on the backup instrument 3 side using the readback signal 351, and matches the output of the D/A conversion circuit 5 with the output of the backup instrument 3. The tracking operation is performed as follows. Therefore, bumpless switching from M mode to A mode is possible.

Next, an example will be described in which, when the digital controller 1 is in the A mode, the backup meter 3 side is switched from the C mode θ) to the L mode and manual operation is performed with the backup meter 3 till. In this case, the L mode switching signal t from the C mode switching s3 results in a backup total of 431&llll.
The C/I selector switch 32 of the digital controller 1 is switched to the L side, and the C/L selector switch 19 of the digital controller 1 is switched to the L side.
is switched to the L side. As a result, the hold amplifier 16 on the digital controller 1 side
The tracking operation is performed by directly receiving the readback signal 35 on the side, and the C
In preparation for switching to mode. At this time, the digital controller 1 detects the readback signal from the C/L mode switching section 31 via the input port 21, so it takes in the readback signal 35 from the A/Di switching circuit 12 and outputs the readback signal from the A/Di switching circuit 12. /A conversion circuit s+j is supplied. Therefore, when the backup meter 391I switches from L mode to C mode, the content of the D/A conversion circuit 15 and the output of the hold amplifier 34 can be made to match even if the L/C changeover switch I9 is set to C1)Ill. I can do it.

The above operation is the same as when the digital controller 1 is in the M mode and the backup instrument 3 is in the L mode. In addition, on the backup key 3 side, in the L mode, the manual operation section 33 for local block/down operation is manually operated by aS to directly increase or decrease the operation output value.

In short, the C/I on the digital controller l side,
The reason for providing the switch 19 is that when the digital controller 1 is in the M mode and the backup meter 3 is in the L mode, when manual operation is performed on the backup meter-a3 side, the output of the hold amplifier 34 due to the manual operation on the digital controller 1 side is This is to supply the held water to the hold tank 6 so that it can be tracked. This C/L switch 1
If 9 is not present, the digital controller 1 will be switched to D/A9 by the A/M+:JJ conversion switch 18 in M mode.
J. Since the path from the switching circuit 15 to the hold amplifier 16 is cut off, it is not possible to track the own hold amplifier 16, and as a result, bumpless disconnection (funny) is not possible.

[Problems with background technology]

However, in the above system, the following problems have been pointed out.

■ Tracking operation for bumpless switching in backup instrument 3 release mode is performed on two functional blocks, D/A conversion circuit 15 and hold amplifier 16, at t14, and the two functional blocks are in normal condition. The bumpless switching function will be normal only in this case. Therefore, if you try to diagnose whether the unit is operating normally or not, the C/L changeover switch button 9 of the digital controller 1
Moreover, since the two functional blocks are separated, it is necessary to diagnose each functional block independently, which has the disadvantage that the diagnostic means becomes complicated.

■ Also, there are two switch elements between the D/A conversion circuit J5 and the hold amplifier J6 (switch JR, 19).
The output system lacks reliability.

(■ Also, digital controller 1lIIIc, C
When PUJJ or other foreign countries are used, switch to the M mode and perform manual operation, but if the backup instrument 3 side is in the mode at C and there is no operator on the backup instrument 3 side, the digital control side is switched to the M mode. A problem arises in that the operating end 5 cannot be operated.

■ A on the upper digital controller l side on the backup instrument 3 side! There is no way to ask the city.

■ ``Backup 1'' The diagnosis 11jt means on the instrument 3 side is not looked down.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and is capable of performing the same tracking operation in both JA mode and M mode of the digital controller. It is possible to improve reliability by removing
To provide a backup system for a digital controller that does not cause sudden changes due to mistaken operation of the operating end, and can also be used to back up the back end.

[Summary of the invention]

In the digital controller I11, the manipulated output value calculated by the CPU is sent to the backup instrument side through an up/down counter and a D/A conversion circuit, and a Maki diagnostic function is installed on the digital controller side. is configured to output a functional abnormality signal in the event of an abnormality. On the other hand, on the backup instrument side, the output of the D/Af converter circuit is held by a hold amplifier via a C/L changeover switch to enable the operating terminal to be operated OT, and is also sent to the digital controller side as a read barrack signal. In addition, the above-mentioned 1 geometrical abnormality signal or backup tl
This is a back-up system for a digital controller that forcibly switches the C/L switch to the L side and directly increases or decreases the manipulated output value on the digital controller side or backup side.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIG. It should be noted that the same parts as in FIG. The system according to the present invention has a digital controller 1 and a backup instrument 3, and is the same as the conventional system in that the operating end 5 is controlled based on the process measurement value from the sensor 4 in the A mode.

The following points are particularly different from the conventional ones: (11 Digital controller 1 is different from conventional ones/
The data output thread consisting of the A change circuit 15 switch 18, 19 and the hold amplifier circuit is replaced by the CPU I
? The parallel data is set to 0 by using the internal bus 10 derived from The D/A conversion circuit 15 is operated manually, so that the digital controller 1 outputs the manipulated output value without the need for conventional switching means.

(2) In addition to the above (A configuration), the digital controller also has an A configuration between the up/down counter 102 and the controller side up/down manual operation section 20.
/ M 9J 4M switch 18' is inserted, and the up/down counter 102 is manually operated so that the up/down counter 102 can be up or down, and the tracking is unified regardless of A mode 2 or M mode. Bumpless cutting has been achieved through operation.

t31 Also, digital controller I'4 (DIh
It is necessary to supervise K and switch the backup instrument 3 side to L mode in case of atrocities. One specific thing is the CPU
The Itomi supervision circuit 104 that monitors the operation of J1' is connected to the first bus JO1j, and the CPU 11'
When it is determined that there is a failure in the /Di conversion circuit 12' or the D/A conversion circuit w315, or a problem with the bumpless switching function, a functional abnormality 1tls! Output boat 105 that outputs p
Then, the previous jd error 19 (function error signal S output from either the logic circuit 104 or the output port ios) is backed up from the digital controller 1 side by a total of 5311Jl.
i, and an OR circuit 106. The above difference,
The monitoring circuit 104 has, for example, a one-shot circuit and an external CR time constant 0 circuit for this circuit, and the CPU 11'
Detecting the presence or absence of the first signal of W where ζ should occur every predetermined time from the circuit for egg, etc.
1.

14) Controller side manual operation part 2 for up/down
The up or down signal of 0 is sent not only to the up/down counter 10 of the digital controller 11till, but also to the backup meter 3ψ when the digital controller l is in the middle of the day. Be successful.

(5) It is possible to display either the output of the digital controller J or the output of the back end knob tl' 3 on the digital controller 1 side.

Specifically, this can be done manually or by using the display changeover switch 107, which is switched to the C side when the digital controller is in the old state, and the display changeover switch 107, which is switched to the C side when the digital controller is in the old state. The output indicator JO& which displays the operation output value is set to 1.

1G) Next, backup Ifil'r3. ? is provided with an OR gate III, and outputs M? from the digital controller J. , the C/L changeover switch 32 is controlled through either the abnormality signal S7 or the output of the C/L mode switching section 31, and the switching side E1 signal -
jjs2 to the input port 2 of the digital controller l.

(7) Backup instrument 3 is AND gate 11
2F, when the backup instrument 3 side is in L mode and the 1-cost S-fault No. The configuration must be able to increase or decrease the output value.

(81 Also, an or gate 113 is set up, and this gate 11
The output terminal of the AND gate 112 is connected to one input terminal of 3, and the manual operation section 33 for back-up probe/down operation is connected to the local input terminal.
are connected to each other, and the output end of the OR gate 113 is connected to the L side of the C/L changeover switch 32, and the OR gate l
] 3 so that either the digital controller 1 or the backup instrument 3 can be operated by hand 41.

(9) Furthermore, in the backup instrument 3, a 4 (screen indicator light 114 is installed on the Tono Maki 4@%-31 line,
The upper digital controller 10] (1.^) can be checked.

Next, the operation of the system configured as described above will be explained. Now, digital controller l is in A mode,
Backup instrument 3 is set to C mode. In this case, the digital controller 1 connects the process field 11I1 detected by the sensor 4 and converted into a digital signal by the A/Di conversion circuit 12' and the RAMJ 31 to the CPU. Compare I J' and calculate the deviation k of both values as P I D f)jlJs+L
The operation output 11K is determined to be zero according to the algorithm and is inputted into the output down counter 102.

Therefore, the contents of this Ryotsubu Down Counter No. 02 are D
The signal is converted by the /A conversion circuit 15 and outputted through the C/1,9174 switch 32 and the hold amplifier 34 on the back end meter 3 side, and is then applied to the 4-step operation.

Next, let's assume that the digital controller switches from A mode to M mode and J mode. Up/down counter 1
Since 02 holds the inner &, it is possible to switch ♂ without bumping. CPU7J' is A/M mode Kirimata 1
Since the 70M mode switching signal is detected through the input port 2 to indicate the M mode, the up/down counter 102 stops the cutting operation. This M
Manual operation in this mode is performed by the controller probe knob down manual operation section 20.

Then, the manual operation ζ of the manual operation section 2o causes the up/down counter 102 to turn up or down, thereby controlling the output value for one operation. At this time, CPU 7
J' is actively monitoring the output of the backup instrument 3 using the readback signal S3j. In any case, since the operation output value in the M mode is held in the up/down counter 102, even if the M mode is switched to the A mode again, the pump press can be switched again.

Next, a case will be described in which when the digital controller is in the A mode, the backup instrument 3 side is switched to the L mode and the -C manual operation is performed. Digital controller 71;r
, since the input port 21 receives the L mode switching signal S2 from the C/L mode switching section 31 via the OR gate llll, it is possible to know that the backup instrument 3 has switched to the L mode.6 At this time, The CPU 7J' reads back the output of a total of 43 backups. Since the up/down counter 102 is taken in from the A/Df conversion circuit 12' for tracking 1lII+, even if the backup tl'4i3 is switched from the mode to the C mode, bumpless operation will be performed. .

At the same time r4, digital controller I or M mode, bank complete set d + appetizer, f3 changed from L mode to C mode (
Even if A is raised, digital controller 1 will
Since the tracking of the down counter 102f is activated, bumpless operation is achieved.

On the other hand, when the digital controller I is 44 seconds old, the heel monitoring circuit 104 and the output hoard 7θ5 function! <
Po Shingetsu was 81 years old and 9 years old. 6 back gamma pumps? ≠
In example 3, 11 receives the 1st digit signal 81 and displays the abnormal condition ``Po'' on the J4 display lamp 114, so that the digital controller 7 on the backup: !I'-gi E side +1111 v !4N You can easily know about the malfunction of digital controller J 1llll.
Since the S switch 324 is given, the backup 8
The positive switch 3I111I does not force the mode side to switch. Conventionally, the operation on the backup instrument 3 side is as follows:
When you perform manual operation in L mode without looking up at the digital controller 10, and then switch to C mode again,
Since the function has stopped and the output of the digital controller 1 and the output of the hold amplifier 34 become 4i, the output of the digital controller 1 becomes 1 and the operating end 5 becomes 1.
However, this can be prevented by displaying the Maki indicator light 114 and switching the strong till mode. In addition, in the third embodiment, the abnormality display and the one-mens control mode Kirin♂ are explained in the same manner, but it is also possible to provide only one of these functions.

Furthermore, the upper digital controller t...? When the water is heavy, the digital control a-rough 11i11 manual operation ii1+ 20 up and down (,
2. Give the hold amplifier 34tζ to the AND gate 112J6 and the OR gate 113 with the j down signal. ), therefore, digital controller number 11/rigara L
Lizu Senryo 1, 1, 1, 1'L 2 tin in J) Iko T Zui. At this time, the digital controller 1 side is
Since the switch 107 has been changed to % full (1./C off by g-S1), the output command 'Mt7' and '8' have backup gt1='33.
The readback message ÷83 can be displayed. Note that the L/C changeover switch 1071J may be manually switched to λ.

Next, the diagnosis ++ji with a total of 6≠3 is A, /
I): The readback No. 14 S3 of the backup 11 unit 3 taken in through the switching circuit 12' 7 is compared with the output signal S4 of the opposite side (A) from the D/Af clamp circuit 15.

This R-off operation is performed when the digital controller 1 is in A mode and the backup instrument 3 is in C mode.
Implemented.

In addition, the digital controller (well, its own output +
By resisting LS4, it is possible to diagnose the up/down counter 102 and the D/A conversion circuit 15 at the same time. In other words, the diagnosis of the backup meter 3 becomes effective based on the prior history that the own output yarn is compressed.

[The young fruits of invention]

The present invention is constructed as described above, and thus achieves the following effects.

■The digital controller (contains a run counter and can be turned up or down by the manual operation section via the CPU cabinet 11 and A/M off switch 1, so the digital controller's A mode and M Tracking operations should be able to be performed uniformly regardless of the mode.

■The output thread of the digital controller is composed of an up/down counter and a D/Af converter circuit, and the conventional A/M cutoff switch and L/C cutoff switch have been removed. can be lowered by A7°.

■, Digital: "Controller's Difference 1:5 o'clock, vi,
W: Display 13+#4 to display the abnormality light 7Iz on the backup instrument 911, and forcefully turn off the C/L 1-
Since the switch is changed to L mode, the operator on the backup instrument side switches from the digital controller to C mode.
N You will be returned to the raking mode, so you can remove the gravel from 1.
I never let anyone down.

(2) Even if the digital controller itself is 1'4'M, it can be slightly manually operated from the digital controller to + while checking the output of the backup instrument.

■Digital controller can disconnect abnormality of backup instrument.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the success and failure of fN in a conventional system, and FIG. 2 is a diagram showing an embodiment of a back-up system for a digital controller according to the present invention. )...Digital controller, 3...Backup instrument, 4...Sensor, 5...Operation 74, 11'.
...CPU, 12...A/D conversion cycle, 15...D/
A conversion! J path, 17... A/M 7-way switching section, 1
B'...A/M off l voice switch, 20...half-1 operation for up/down'f+52no...input port, 3no...C/L mode off m rjll, 32...・
C/1. On/off switch, 33... Up/down small manual operation 15.94... Hold completed, 102...
・Complete down counter, 104... Maki supervisor's circuit, 105... Output boat, 107... Shi/C
C cut-off switch 10B...output indicator, 117,
IJ,? ...OR gate, 112...AND gate, 114...Abnormal J light. Takeshi Suzue, Patent Attorney, Figure 1

Claims (1)

[Claims] Is the digitized process time-consuming via the fil A/Df111 circuit? A bank-up system I includes a digital controller that compares the standard value and the monthly value by a CPU, and outputs an operation output value that reduces the deviation, and a backup instrument that backs up this digital controller. The left roller is controlled by the mode switching signal of the automatic/manual mode switching section on the control side. Opponent # + operation part,
The CPU ζ generates an up/grand counter that goes up or down in response to the operation output value or a down signal of the manual operation 1S for up/down on the control side when in automatic mode, and converts the contents of this counter into analog. The backup instrument has an output thread that outputs an Ail operation output value by connecting a /A conversion circuit, and an abnormality signal generation means that outputs an abnormality signal when the digital controller is abnormal. Functional abnormality signal J or backup side automatic/manual mode switching-HB
When the center/local changeover switch is on the local side, the center/local changeover switch is forcibly switched to local mode by the manual mode changeover signal of A backup system for a digital controller, characterized in that it has a manual operation means for raising and lowering the contents of the hold amplifier by a manual operation section or a backup side up/down auxiliary operation section. t21 A digital controller that compares the digitized process measurement 11σ taken through the A/D conversion circuit with a target value using a CPU, and outputs an operation output value that reduces the deviation; In a backup system having a backup N1 device for backing up this digital controller, the digital controller has a self-#
/The control side up/down manual operation unit connected to the manual side terminal of the manual changeover switch, and the mJ CP
An up/down counter that goes up or down according to the operation output value determined by H or an up or down signal from the manual operation section for up/down on the control side when in automatic mode, and a D/A conversion circuit that converts the contents of this counter into analog. and an output thread that outputs the manipulated output value by connecting the output string, and the backup instrument described in Ia connects a bold amplifier to the output system via a center/local changeover switch, and outputs the manipulated output value from the bold amplifier. A backup system for a digital controller, comprising a control terminal and means for reading back and supplying a value to an A/D conversion circuit.