CN206133294U - Controller fault protection system - Google Patents
Controller fault protection system Download PDFInfo
- Publication number
- CN206133294U CN206133294U CN201620721284.8U CN201620721284U CN206133294U CN 206133294 U CN206133294 U CN 206133294U CN 201620721284 U CN201620721284 U CN 201620721284U CN 206133294 U CN206133294 U CN 206133294U
- Authority
- CN
- China
- Prior art keywords
- signal
- controller
- time
- burst signal
- switch unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Safety Devices In Control Systems (AREA)
Abstract
The utility model provides a controller fault protection system, includes interconnect's controller and fault protection device, wherein, controller output diagnoses the signal, the diagnosis signal just often is the burst signal, the fault protection device is right the diagnosis signal detects, if judge the high level duration of diagnosis signal is greater than the high level duration T1 of burst signal, perhaps the low level duration of diagnosis signal is greater than the low level duration T2 of burst signal then generates the fault protection signal. This application is diagnostic control ware trouble, formation fault protection signal in time, simply, reliably just has the commonality.
Description
Technical field
This utility model is related to controller failure protection, more particularly, to a kind of controller failure protection system.
Background technology
Safety depends on the situation of systemic-function to be referred to as " functional safety ", and safety-related systems are undertaking process monitoring times
While business, the task of Safety Risk in Production control is also assume responsibility for, what functional safety was prevented is safety-related systems or equipment
It is dangerous caused by disabler institute.
Functional safety controller is that the system of application risk control, method carry out a class of design of hardware and software and specially control
Device, technical requirements are high, product is few, expensive.Still there are considerable industrial applications, including power plant at present, due to collection
It is middle to monitor and be easy to the needs safeguarded, more using Safety-Related System and conventional dcs (DCS：
Distributed Control System) or programmable logic controller (PLC) (PLC：Programmable Logic
Controller) design of hardware and software integration, does not realize safety protection function with special functional safety controller,
The method for improving safety system reliability is essentially all that redundant manipulator is separately configured.This can cause system complex and
Increase cost, and, under the extreme case of controller all failures of redundancy, it is impossible to effectively ensure that by protection equipment in peace
Total state.
PLC is a kind of using a class programmable memory, for its internally stored program, execution logic computing, order
The user oriented instructions such as control, timing, counting and arithmetical operation, and it is various by numeral or analog pattern input/output control
The machinery of type or production process.
DCS is referred to as Distributed Control System, is a kind of novel computer control for Centralized Control System
System, it is development, differentiation on the basis of Centralized Control System.It is one and is supervised by process control level and process
The multi-level computer system with communication network as tie of control level composition, combines the 4C skills such as computer, communication, display and control
Art, its basic thought is that decentralised control, centralized operation, administration by different levels, flexible configuration and configuration are convenient.
Above-mentioned DCS and PLC have been widely used in various control fields, these controllers in running,
Controller itself and other external components, software itself all may break down, and make place controller out of hand and protect
Function, makes whole control system paralyse when serious, cause great economic loss.
The ultimate principle of the protection of traditional controller failure is the controller portion provided according to control system by operator
Part diagnostic message and controlled abnormal parameters situation carry out comprehensive descision, determine controller whether failure, then operational control during failure
Device controls and protects the scram button of object so as in a safe condition.But, time-consuming for this error protection mode, it is impossible to
Failure is found in time and processed in time, avoided harm.And not with versatility.
Utility model content
In view of this, this utility model provides a kind of controller failure protection system, including the controller being connected with each other
And failure protecting device, wherein：
The controller exports diagnostic signal, and the diagnostic signal is burst signal when normal；
The failure protecting device detects that the high level of diagnostic signal continues as described in judging to the diagnostic signal
Time is more than the high level lasting time T1 of the burst signal, or the low duration of the diagnostic signal is more than
The low duration T2 of the burst signal, then generate error protection signal.
Such scheme can diagnosing controller failure in time, protect controller function safety, it is simple, reliable and with general
Property.
Description of the drawings
Fig. 1 is the Organization Chart of the controller plc fault protection system of this utility model embodiment one；
Fig. 2 is the module map of failure protecting device in this utility model embodiment one, two；
Fig. 3 is the circuit diagram of the first measure loop in application example of the present utility model；
Fig. 4 is the circuit diagram of the second measure loop in application example of the present utility model；
Fig. 5 is the circuit diagram in signal generation loop in application example of the present utility model；
Fig. 6 is the schematic diagram that application example of the present utility model triggers trip(ping) circuit by relay contact.
Specific embodiment
To make the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing to this
The embodiment of utility model is described in detail.It should be noted that in the case where not conflicting, embodiment in the application and
Feature in embodiment can mutual combination in any.
It should be noted that specification and claims and term " first ", " second " in accompanying drawing etc. are for area
Not Lei Si object, without for describing specific order or precedence.
It is a kind of different from conventional failure protection thinking be：The catastrophe failure of controller is finally all embodied in controller can not
Its control task being endowed correctly and efficiently is performed, controller can export a train of pulse while control task is performed
Signal is used as diagnostic signal (being supplied to the outside signal for diagnosing controller failure).If that diagnostic signal exception,
Indicate that controller can not normally perform control task.But, how control is realized based on the diagnostic signal of controller output
Device functional safety processed, remains the problem for needing to solve.
Embodiment one
The present embodiment provides a kind of controller failure protection system, as shown in figure 1, including the He of controller 10 being connected with each other
Failure protecting device 20, wherein：
The controller exports diagnostic signal, and the diagnostic signal is burst signal when normal；
The failure protecting device detects that the high level of diagnostic signal continues as described in judging to the diagnostic signal
Time is more than the high level lasting time T1 of the burst signal, or the low duration of the diagnostic signal is more than
The low duration T2 of the burst signal, then generate error protection signal.
By high level lasting time and T1 to diagnostic signal, and the low duration and the ratio of T2 of diagnostic signal
Compared with if the high level lasting time of diagnostic signal is more than T2 more than T1 or low duration, all illustrating diagnosis letter
Number no longer it is a burst signal, error protection signal is generated therefore, it is possible to determine diagnostic signal abnormal.
In the present embodiment, as shown in Fig. 2 the failure protecting device includes：
First detection circuit 201, including the first switch unit and the first deferred action unit of series connection, the first switch
The turn-on time of unit by first burst signal the control of high level lasting time or low duration, described the
The action when the turn-on time of the first switch unit default first delay time T1 ' is reached of one deferred action unit, T1 '
>T1；
Second detection circuit 202, including the second switch unit and the second deferred action unit of series connection, the second switch
The turn-on time of unit by second burst signal the control of high level lasting time or low duration, described the
The action when the turn-on time of the second switch unit default second delay time T2 ' is reached of two deferred action units, T2 '
>T2；
Signal generating circuit 203, in the first deferred action unit and the second deferred action unit is detected
When having any one action, error protection signal is generated.
In the present embodiment, the burst signal includes the first burst signal and the second train of pulse letter of opposite in phase
Number；
The controller failure protection system also includes：
First drive circuit, by first burst signal of input the make-and-break signal of first switch unit is converted to,
Automatic level control of the break-make of the first switch unit by first burst signal；
Second drive circuit, by second burst signal of input the make-and-break signal of second switch unit is converted to,
Automatic level control of the break-make of the second switch unit by second burst signal；
First drive circuit and the second drive circuit are a parts for the output driving circuit of the controller, or
It is a part for the failure protecting device.The first drive circuit 204 and the second drive circuit have been shown by the dashed box in Fig. 2
205, illustrate that the two circuits are optional, because can also realize in controller side.
In another embodiment, the burst signal includes the first burst signal；
As shown in Fig. 2 the failure protecting device also includes：
First drive circuit 204, by first burst signal of input the break-make letter of first switch unit is converted to
Number, the break-make of the first switch unit receives the Automatic level control of first burst signal；
Negative circuit 206, by input first burst signal it is anti-phase after, be output as the second burst signal；
Second drive circuit 205, by second burst signal of input the break-make letter of second switch unit is converted to
Number, the break-make of the second switch unit receives the Automatic level control of second burst signal.
From unlike the present embodiment, controller only exports train of pulse letter all the way to this implementation under this implementation
Number, need failure protecting device that its is anti-phase, obtain another road burst signal with its opposite in phase.Negative circuit is one
Circuit common is planted, using analog circuit digital circuit, this utility model can also be adopted to repeat no more.
In the present embodiment,
First drive circuit includes that first drives relay, and the first switch unit is the first driving relay
The contact of device, referred to herein as the first contact；
Second drive circuit includes that second drives relay, and the second switch unit is the second driving relay
The contact of device, referred to herein as the second contact；
The connection of first contact and the second contact is respectively by first burst signal and the second burst signal
High level or low level control.
But this utility model is not limited to this mode of relay, it is possible to achieve the circuit of above-mentioned functions or another control
Device can be adopted.
In the present embodiment, the dutycycle of the burst signal is 1, high level lasting time T1 and low duration
T2 is equal to controlling cycle T of the controller.But this utility model is not limited to this, such as T1 and T2 can also be equal to 2T, but
It is that failure can be full out found during T1=T2=T.
In the present embodiment, the first deferred action unit be the first time-delay relay, the second deferred action unit
For the second time-delay relay.But it should be recognized that the device that can realize deferred action function is not limited to time-delay relay,
It is likely to be realized using the mode such as discrete component or integrated circuit,
In the present embodiment, the signal generating circuit includes the normally opened of first time-delay relay of composition parallel-connection structure
Contact and the normally opened contact of second time-delay relay；Or, the signal generating circuit includes the institute of composition cascaded structure
State the normally-closed contact of the first time-delay relay and the normally-closed contact of second time-delay relay.So, in first time delay
When having any one action in motor unit and the second deferred action unit, it becomes possible to generate error protection signal.
In the present embodiment, the signal generating circuit also includes：The 3rd connected with the parallel-connection structure or cascaded structure
Relay.The contact of the 3rd relay can be supplied to external circuit, for example, the contact of the 3rd relay is accessed into the control
Device control processed and the trip(ping) circuit of protection object, for triggering the trip(ping) circuit action, realize the functional safety of the object.
In one embodiment, controller noted above is a controller in the control system using single controller configuration.
In another embodiment, the controller can be the redundant manipulator in redundancy control system, the Redundant Control
All of redundant manipulator exports the diagnostic signal by public interface in system.Obviously, common interface here is in control
Device processed can only need to one when exporting a burst signal, and when controller exports two burst signals, then need
There are two.So, when diagnosis is to redundant manipulator failure, it is possible to determine all of redundancy in the redundancy control system
Controller there occurs failure, and be protected in time.
In the present embodiment, the controller is that digital signal upset logic is performed while control task is performed, and is generated
Burst signal is simultaneously exported as the diagnostic signal.
Embodiment two
The present embodiment provides a kind of failure protecting device, for examining the normal diagnostic signal for burst signal
Disconnected, its function is consistent with the failure protecting device in embodiment one, but the present embodiment mainly describes the structure of itself, such as schemes
Shown in 2, the failure protecting device includes：
First detection circuit 201, including the first switch unit and the first deferred action unit of series connection, first time delay
Motor unit action when the turn-on time of the first switch unit default first delay time is reached；
Second detection circuit 202, including the second switch unit and the second deferred action unit of series connection, second time delay
Motor unit action when reaching between default second time delay the turn-on time of the second switch unit；
Signal generating circuit 203, in the first deferred action unit and the second deferred action unit is detected
When having any one action, error protection signal is generated.
In the present embodiment, the first switch unit is the first contact that controller external interface is provided；Described second opens
Close the second contact that unit is that the controller external interface is provided.But in another embodiment, above-mentioned two contact is in failure
, specifically, there are two kinds of structures protection device side：
Structure one：
The failure protecting device also includes：
First drive circuit, including the first driving relay, the first switch unit is the first driving relay
Contact, it is described first driving relay input be used for receive external signal input；
Second drive circuit, including the second driving relay, the second switch unit is the second driving relay
Contact, it is described first driving relay input be used for receive external signal input.
Two burst signals can be converted to corresponding contact make-and-break signal by the structure.
Structure two：
The failure protecting device also includes：
First drive circuit, including the first driving relay, the first switch unit is the first driving relay
Contact, it is described first driving relay input be used for receive external signal input；
Negative circuit, receives external signal input, by the anti-phase rear output of the external signal；
Second drive circuit, including the second driving relay, the second switch unit is the second driving relay
Contact, it is described second driving relay input be connected with the outfan of the negative circuit.
The structure can generate another opposite in phase when only one of which burst signal is input into by negative circuit
Burst signal, is reconverted into the make-and-break signal of two contacts.
In the present embodiment, the first deferred action unit be the first time-delay relay, the second deferred action unit
For the second time-delay relay.
In the present embodiment,
The signal generating circuit includes the normally opened contact of first time-delay relay of composition parallel-connection structure and described
The normally opened contact of the second time-delay relay；Or
The signal generating circuit includes the normally-closed contact of first time-delay relay of composition cascaded structure and described
The normally-closed contact of the second time-delay relay.
In the present embodiment,
The signal generating circuit also includes：The 3rd relay connected with the parallel-connection structure or cascaded structure.
In the present embodiment,
First delay time of the first deferred action unit is equal to the second time delay of the second deferred action unit
Time.
With several examples this utility model is illustrated again below.
Example one
This example diagnostic controller (such as DCS, PLC etc.) failure, using additional relay circuit error protection letter is generated
Number, the error protection signal may act on the trip(ping) circuit of controller institute protection equipment, realize the purpose of protection.
In this example, the normal diagnostic signal of controller output be with controlling cycle T as width, that dutycycle is 1
One burst signal (being referred to as controller fluctuating signal) and the second burst signal with its opposite in phase.Two arteries and veins
Rush string signal to be respectively converted into after the make-and-break signal of the first contact and the second contact from outside port output by drive circuit.Drive
Galvanic electricity road can drive relay reality simply by the first driving relay and second for receiving two burst signal inputs
Existing, the connection of the contact of the first driver is controlled by the high level of the first burst signal, the connection of the contact of the second driver
Controlled by the high level of the second burst signal；Certainly if normally-closed contact, the connection of two contacts can also respectively receive two
The low level control of individual burst signal.If controller failure, it is 1 that burst signal will be changed into long-time or long-time is 0,
No longer it is burst signal, that is, shows as diagnostic signal exception.Correspondingly, always there is a meeting long-time to be in two contacts to connect
Logical state.
One good failure protecting device should meet：1. circuit reliability is high, without in complexity such as other controllers
Electronic device, the protection signal of generation can be applied directly to equipment protection loop, make device action to safe condition；2. controller
When the burst signal of output is normal, (when protection act adopts positive logic, protection signal state is 0 i.e. low electricity for unprotect action
It is flat；When protection act adopts negative logic, protection signal state is 1 i.e. high level)；And work as controller output burst signal it is different
Chang Shi, (when protection act adopts positive logic, protection signal state is 1 protection act；When protection act adopts negative logic, protect
Shield signal condition is for 0).This example illustrates the composition of error protection signal generating circuit so that protection act adopts positive logic as an example：
In this example, error protection signal generating circuit is using relay group into as long as electromagnetic coil relay and contact
Capacity Selection is suitable, and its reliability is high, traditional protection loop, including high-voltage electrical apparatus protective loop is all made up of relay；
Fig. 3 to Fig. 6 is referred to, is several loops that this example faults protection device includes, what Fig. 3 was represented is the first detection
What loop, Fig. 4 were represented is the second measure loop, and what Fig. 5 was represented is signal generation loop.These loops may be located at same control
In circuit processed,
In Fig. 3, Fig. 4, the passage of the on-off output card DO that the first contact is equipped with by controller is drawn, and is denoted as
DOPULSE1；Another passage of the on-off output card DO that the second contact is equipped with by controller is drawn, and is denoted as DOPULSE2.
DOPULSE1 and DOPULSE2 are sent to respectively the first time-delay relay and the second time-delay relay, described two time-delay relays
Delay time is all higher than the controlling cycle of controller, and this example is set to 2 times of controlling cycle.Delay time is oversize will to be affected to protect
The promptness of shield action, and it is shorter if be easily caused and send out by mistake a protection signal.The actual time delay time can be according to the control of controller
The determinacy case (i.e. whether controlling cycle is accurately and stable) in cycle processed is suitably adjusted.
When controller fluctuating signal is normal, two time-delay relays are all failure to actuate, unprotect signal generation；Work as controller
During failure, if the first burst signal long-time (more than the delay time of the first time-delay relay) rests on 1 state, Fig. 3
In the first time-delay relay generation action, the closing of contact.If the second burst signal long-time (is more than the second time-delay relay
Delay time) when resting on 1 state, the second time-delay relay generation action in Fig. 4, the closing of contact.In Figure 5,2 are prolonged
When relay contact be parallel-connection structure, have a closure, the parallel-connection structure will produce controller failure protection signal, originally show
This is a signal that must be electric in example.The error protection signal can be used for controlling the break-make of the 3rd relay, so with this
The purpose of protection in time is realized by the trip(ping) circuit action of protection equipment to trigger in the contact of three relays.Except making controller
Protection equipment tripping operation is outer, and above-mentioned error protection signal can be also used for other purposes, and for example, the switching of different control modes is produced
Raw fault alarm etc..
It is easily understood that in another example, when the contact of the first time-delay relay and the second time-delay relay adopts
During normally-closed contact, two contacts for prolonging electrical equipment should then adopt cascaded structure in Fig. 5, so as in arbitrary time-delay relay action
When produce error protection signal, unlike this example, the error protection signal is the signal of a dead electricity.
As described above, the controller failure protection system of this example realizes the timely detection to controller failure, can be with
Generate error protection signal, and simply, it is reliable and with versatility.
In another example, controller noted above is the redundant manipulator in redundancy control system, the spy of the controller of redundancy
Point is that multiple (usually 2) are mutually redundant standby controller and perform same control task, when being carrying out control task
Controller failure when, the spare controller for automatically switching to it is continued executing with into control task, only when all Redundant Controls
Device all failure when, just need to be protected using other methods.Therefore, all of Redundant Control in the example redundancy control system
Device is all exported diagnostic signal by common interface, so, when the diagnostic signal for detecting the common interface output is abnormal, just
Show all of redundant manipulator failure in the redundancy control system and need to be protected by supplementary mode.
Preferred embodiment of the present utility model is the foregoing is only, this utility model is not limited to, for this
For the technical staff in field, this utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvements made etc. should be included within protection domain of the present utility model.
Claims (10)
1. a kind of controller failure protection system, it is characterised in that including the controller and failure protecting device that are connected with each other, its
In：
The controller exports diagnostic signal, and the diagnostic signal is burst signal when normal；
The failure protecting device detects to the diagnostic signal, the high level lasting time of diagnostic signal as described in judging
More than the high level lasting time T1 of the burst signal, or the low duration of the diagnostic signal is more than described
The low duration T2 of burst signal, then generate error protection signal.
2. controller failure protection system as claimed in claim 1, it is characterised in that：
The burst signal includes first burst signal and the second burst signal of opposite in phase；
The controller failure protection system also includes：
First drive circuit, by first burst signal of input the make-and-break signal of first switch unit is converted to, described
Automatic level control of the break-make of first switch unit by first burst signal；
Second drive circuit, by second burst signal of input the make-and-break signal of second switch unit is converted to, described
Automatic level control of the break-make of second switch unit by second burst signal；
First drive circuit and the second drive circuit are a parts for the output driving circuit of the controller, or institute
State a part for failure protecting device.
3. controller failure protection system as claimed in claim 1, it is characterised in that：
The burst signal includes the first burst signal；
The failure protecting device also includes：
First drive circuit, by first burst signal of input the make-and-break signal of first switch unit is converted to, described
Automatic level control of the break-make of first switch unit by first burst signal；
Negative circuit, by input first burst signal it is anti-phase after, be output as the second burst signal；
Second drive circuit, by second burst signal of input the make-and-break signal of second switch unit is converted to, described
Automatic level control of the break-make of second switch unit by second burst signal.
4. controller failure protection system as claimed in claim 2 or claim 3, it is characterised in that：
First drive circuit includes that first drives relay, and the first switch unit is the first driving relay
Contact；
Second drive circuit includes that second drives relay, and the second switch unit is the second driving relay
Contact；
First train of pulse is received respectively in the connection of the contact of the described first contact for driving relay and the second driving relay
The high level or low level control of signal and the second burst signal.
5. controller failure protection system as claimed in claim 2 or claim 3, it is characterised in that：
The failure protecting device includes：
First detection circuit, including the first switch unit and the first deferred action unit of series connection, the first switch unit
Turn-on time is controlled by the high level lasting time or low duration of first burst signal, first time delay
Motor unit action when the turn-on time of the first switch unit default first delay time T1 ' is reached, T1 '>T1；
Second detection circuit, including the second switch unit and the second deferred action unit of series connection, the second switch unit
Turn-on time is controlled by the high level lasting time or low duration of second burst signal, second time delay
Motor unit action when the turn-on time of the second switch unit default second delay time T2 ' is reached, T2 '>T2；
Signal generating circuit, has any one in the first deferred action unit and the second deferred action unit is detected
During individual action, error protection signal is generated.
6. controller failure protection system as claimed in claim 5, it is characterised in that：
The first deferred action unit is the first time-delay relay, and the second deferred action unit is the second time delay relay
Device.
7. controller failure protection system as claimed in claim 6, it is characterised in that：
The signal generating circuit includes the normally opened contact and described second of first time-delay relay of composition parallel-connection structure
The normally opened contact of time-delay relay；Or
The signal generating circuit includes the normally-closed contact and described second of first time-delay relay of composition cascaded structure
The normally-closed contact of time-delay relay.
8. controller failure protection system as claimed in claim 7, it is characterised in that：
The signal generating circuit also includes：The 3rd relay connected with the parallel-connection structure or cascaded structure, the described 3rd
The contact of relay accesses the controller control and protects the trip(ping) circuit of object, for triggering the trip(ping) circuit action,
Realize the functional safety of the object.
9. the controller failure protection system as described in arbitrary in claim 1-3,6-8, it is characterised in that：
The dutycycle of the burst signal is 1, and high level lasting time T1 and low duration T2 is equal to the control
Controlling cycle T of device processed.
10. the controller failure protection system as described in arbitrary in claim 1-3,6-8, it is characterised in that：
The controller is a controller in the control system using single controller configuration；Or
The controller is the redundant manipulator in redundancy control system, all of redundant manipulator in the redundancy control system
The diagnostic signal is exported by public interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620721284.8U CN206133294U (en) | 2016-07-08 | 2016-07-08 | Controller fault protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620721284.8U CN206133294U (en) | 2016-07-08 | 2016-07-08 | Controller fault protection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206133294U true CN206133294U (en) | 2017-04-26 |
Family
ID=58561325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620721284.8U Expired - Fee Related CN206133294U (en) | 2016-07-08 | 2016-07-08 | Controller fault protection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206133294U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161955A (en) * | 2019-05-31 | 2019-08-23 | 广东电网有限责任公司 | A kind of transformer Cooling case PLC failure emergency processing method and normally opened relay |
| CN110526052A (en) * | 2019-09-12 | 2019-12-03 | 上海和兰透平动力技术有限公司 | Control system of actuating mechanism |
| CN111765003A (en) * | 2020-07-22 | 2020-10-13 | 东风汽车股份有限公司 | Engine crankcase ventilation device OBD diagnosis method based on electric loop |
-
2016
- 2016-07-08 CN CN201620721284.8U patent/CN206133294U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161955A (en) * | 2019-05-31 | 2019-08-23 | 广东电网有限责任公司 | A kind of transformer Cooling case PLC failure emergency processing method and normally opened relay |
| CN110161955B (en) * | 2019-05-31 | 2024-02-02 | 广东电网有限责任公司 | Transformer cooling box PLC fault emergency processing method and normally open relay |
| CN110526052A (en) * | 2019-09-12 | 2019-12-03 | 上海和兰透平动力技术有限公司 | Control system of actuating mechanism |
| CN110526052B (en) * | 2019-09-12 | 2024-03-15 | 上海和兰透平动力技术有限公司 | Actuator control system |
| CN111765003A (en) * | 2020-07-22 | 2020-10-13 | 东风汽车股份有限公司 | Engine crankcase ventilation device OBD diagnosis method based on electric loop |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105759781B (en) | The wiring method of robot | |
| CN109541457A (en) | Power battery high-voltage relay control circuit and method for diagnosing faults | |
| CN110794805B (en) | Robot safety circuit and control method thereof | |
| CN102890235A (en) | Fault detection method and device | |
| CN206133294U (en) | Controller fault protection system | |
| CN106877291A (en) | A kind of safe torque breaking circuit and system | |
| CN108493904A (en) | IGBT Safety Shutdown Systems and method for automobile motor shutdown | |
| CN110174886B (en) | Power supply monitoring and alarming method and system for DCS (distributed control System) driving control loop of nuclear power station | |
| CN105846806A (en) | Relay unit, control method for relay unit | |
| CN109032318A (en) | A kind of power monitoring system and storage server system | |
| CN103558541A (en) | Self-checking for safe output circuit | |
| US9689929B2 (en) | Two wire combined power and data network system segment with fault protection device | |
| CN110376931B (en) | Functional safety current output module with high diagnosis coverage rate | |
| GB2159987A (en) | Distributed input/output system | |
| CN101782617B (en) | Method and device for detecting circuit faults | |
| EP4206697A1 (en) | Self-locking and detection circuit and apparatus, and control method | |
| CN205983197U (en) | Fault detection apparatus | |
| US5093804A (en) | Programmable controller input/output communications system | |
| CN105652191B (en) | A kind of safety return circuit condition monitoring system | |
| JPS6213119A (en) | Non-contact proximity switch | |
| CN109066604B (en) | Generator low-voltage protection system of million-kilowatt nuclear power station | |
| CN115092208A (en) | Full electronic interlocking system QM-SIG signal board card | |
| CN202798004U (en) | Intelligent compound switch | |
| GB2277814A (en) | Fault tolerant programmable logic controller | |
| CN107589733B (en) | Method and system for generating controller diagnosis signal, protecting fault and ensuring functional safety |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170426 Termination date: 20180708 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |