CN105955091B - A kind of selection method of two analog inputs selection device - Google Patents
A kind of selection method of two analog inputs selection device Download PDFInfo
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- CN105955091B CN105955091B CN201610547781.5A CN201610547781A CN105955091B CN 105955091 B CN105955091 B CN 105955091B CN 201610547781 A CN201610547781 A CN 201610547781A CN 105955091 B CN105955091 B CN 105955091B
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
Abstract
A kind of selection method of two analog inputs selection device, the device includes the first measuring instrumentss and the second measuring instrumentss being fixed in measurement object, first measuring instrumentss and the second measuring instrumentss are connect with any one terminal board input channel in input end daughter board by two conducting wires respectively, the anode of measuring instrumentss is connected with the positive terminal of terminal board input channel, cathode is connected with the negative terminal of terminal board input channel, input end daughter board is connect with analog input module, it is connected between analog input module and controller by standard CAN bus, power module passes through two power supply lines respectively and connect with controller and analog input module；The invention also discloses the selection methods of the device；Apparatus of the present invention connection structure is simple, can be with flexible choice, working method multiplicity to two analog measurement values, and working method can flexibly switch, output analog measurement value is accurate and reliable, and the accuracy of measured value, high reliablity will not be influenced because of the fluctuation or damage of some measuring point.
Description
Technical field
The present invention relates to power plant's control technology fields, and in particular to a kind of selecting party of two analog input selection devices
Method.
Background technique
A large amount of analog measurement value, such as main steam pressure are contained in fired power generating unit power generation process, temperature gives coal
Amount, condensing water flow etc..These measured values directly determine unit whether can safe power generation, the accuracy of measured value is to unit
It controls most important.The measured value of mistake frequently can lead to that generating set is non-to stop, serious to will cause equipment damage, casualties
Etc. serious accidents.So thermal power plant can all install multiple measuring points in important node, increased by the selection of multiple measuring points
The accuracy of measured value.The selection method of multiple measuring points is most important, during many selection methods only take mean value or take at present
Between be worth, this selection method have potential limitation, it is impossible to meet the demands of fired power generating unit security control.It is basic herein
On, propose a kind of two analog input selection device and method.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of selection method of two analog input selection devices, the dresses
It is simple to set connection structure, can be with flexible choice, working method multiplicity to two analog measurement values, and working method can spirit
Switching living, output analog measurement value is accurate and reliable, will not influence measured value because of the fluctuation or damage of some measuring point
Accuracy, high reliablity.
To achieve the above objectives, the present invention adopts the following technical scheme:
A kind of two analog input selection devices, are surveyed including the first measuring instrumentss A being fixed on measurement object M and second
Amount instrument B, the first measuring instrumentss A and the second measuring instrumentss B are inputted with any one terminal board in input end daughter board D respectively
Channel is by two conducting wire connections, and wherein the anode of measuring instrumentss is connected with the positive terminal of terminal board input channel, measures
The cathode of instrument is connected with the negative terminal of terminal board input channel, and input end daughter board D is connect with analog input module E,
Between analog input module E and controller F by standard CAN bus connect, power module G pass through respectively two power supply lines with
Controller F is connected with analog input module E, provides 5V direct current supply to controller F, provides 24V to analog input module E
Direct current supply.
The first measuring instrumentss A and the second measuring instrumentss B are all made of 4-20mA two-wire system measuring instrumentss.
The input end daughter board D include 8 terminal board input channels, be respectively designated as first end daughter board input channel DC1,
Second end daughter board input channel DC2, third terminal plate input channel DC3, forth terminal plate input channel DC4, the 5th terminal board
Input channel DC5, the 6th terminal board input channel DC6, the 7th terminal board input channel DC7 and the 8th terminal board input channel
DC8, each terminal board input channel include two binding posts, and one is positive terminal, another is negative terminal；It is described
Analog input module E includes 8 module input channels, is respectively designated as the first module input channel EC1, the input of the second module
Channel EC2, third module input channel EC3, the 4th module input channel EC4, the 5th module input channel EC5, the 6th module
Input channel EC6, the 7th module input channel EC7 and the 8th module input channel EC8；Input end daughter board D and analog input
Module E is connected by the DB37 line of standard, and the connection relationship between channel is first end daughter board input channel DC1 and the first module
Input channel EC1 connection, second end daughter board input channel DC2 are connect with the second module input channel EC2, and so on, the 8th
Terminal board input channel DC8 is connect with the 8th module input channel EC8.
The selection method of two analog inputs selection device described above, the first measuring instrumentss A and the second measuring instrumentss B are real
When measurement object M is measured, measured value is respectively the first measured value AV1 and the second measured value AV2；Controller F passes through mould
Analog quantity inputting modular unit E, input end daughter board D are to set the measurement of the first measured value AV1 and second that the period acquires measuring instrumentss in real time
Value AV2, and assignment is respectively as the first analog input AI1 and the second analog input AI2 of two analog inputs；Two simulations
Amount output includes: two to select output valve AO, way of output MOD, alarm signal A LM and cut manual ringing MRE, and intermediate parameters are alarm
The value of alarm deviation is set dynamically according to requirement of engineering by deviation D EV, alarm deviation D EV；
The the first analog input AI1 and the second analog input AI2 of two analog inputs respectively to Qua1 and Qua2,
The quality of middle Qua1 reflection AI1, Qua2 reflect the quality of AI2；There are two types of states for quality, are illustrated with Qua1: good quality, corresponding
Qua1=0；Bad quality, corresponding Qua1=1 carry out Quality estimation according to the first measured value AV1 of measuring instrumentss, when the first measurement
The first measured value AV1 that instrument A is provided is beyond after 3-21mA, Qua1=1, when connecing for the first measuring instrumentss and input end daughter board D
Line disconnects or short circuit, Qua1=1, other normal measurements Qua1=0；The judgment method of Qua2 and Qua1 is identical；Two select it is defeated
The quality representation of value AO is QuaAO out, when QuaAO=0 indicates that two select output valve AO for good quality, when QuaAO=1 indicates two choosings
Output valve AO is bad quality；
As long as it is bad quality that the first analog input AI1 and the second analog input AI2 of two analog inputs, which have one,
Or both deviation be greater than alarm deviation when, then warning output ALM be 1；First analog input AI1 of two analog inputs and
When second analog input AI2 is bad quality or is that good quality but the two deviation are greater than alarm deviation D EV, then manual letter is cut
Number MRE is 1；The the first analog input AI1 and the second analog input AI2 of two analog inputs are bad quality or preferably
When quality but the two deviation are more than alarm deviation D EV, two select output valve AO to remain unchanged, and two select the quality Q uaAO of output valve AO
=1；
The selection of two analog inputs has 5 kinds of working methods, respectively the first analog input AI1, the second analog input
AI2, two analog input maximum values, two analog input average values, two analog input minimum values；
1), working method is the first analog input AI1
(1) Qua1=0, two select output valve AO=AI1, QuaAO=0, export as good quality；MOD=1；
(2) Qua1=1, Qua2=0, two select output valve AO=AI2, and QuaAO=0 output is good quality；MOD=2；
(3) Qua1=1, Qua2=1, two select output valve AO to remain unchanged, and QuaAO=1 output is bad quality；MOD is kept；
2), working method is the second analog input AI2
(1) Qua2=0, two select output valve AO=AI2, QuaAO=0, export as good quality；MOD=2；
(2) Qua1=0, Qua2=1, two select output valve AO=AI1, and QuaAO=0 output is good quality；MOD=1；
(3) Qua1=1, Qua2=1, two select output valve AO to remain unchanged, and QuaAO=1 output is bad quality；MOD is kept；
3), maximum value working method
Work as AI1>AI2, two select output valve AO=AI1, and as AI1<AI2, two select output valve AO=AI2；MOD=3；
4), average value working method
It exports AO=(AI1+AI2)/2, MOD=4；
5), minimum value working method
Work as AI1>AI2, export AO=AI2, as AI1<AI2, exports AO=AI1；MOD=5.
The controller F's sets the period as 50 milliseconds of integral multiple.
Compared to the prior art the present invention, has the advantages that
1, two analog inputs selection working method is more, and user can be according to demand into the reasonable operating mode of selection.
2, two analog inputs selection can select two analog quantitys, export an analog measurement value to unit
Control uses, and outputting measurement value is accurate and reliable, provides guarantee for the safe operation of unit.
3, the selection of two analog inputs can be configured alarm deviation, and provide real-time analog input alarm
Function carries out real-time alarm decision to two analog input values and alarm deviation.
4, the selection of two analog inputs judges the quality of input analog quantity, while having judged to export analog quantity
Quality.
Detailed description of the invention
Fig. 1 is two analog input selection devices of one kind composition and connection structure diagram schematic diagram.
Fig. 2 is a kind of two analog input selection method logical model figures.
Fig. 3 is two analog inputs selection application schematic diagram.
Specific embodiment
Below in conjunction with the application example in attached drawing and engineering, the invention will be described in further detail.
As shown in Figure 1, a kind of two analog input selection devices, it is characterised in that: including being fixed on measurement object M upper the
One measuring instrumentss A and the second measuring instrumentss B, the first measuring instrumentss A and the second measuring instrumentss B respectively with input end daughter board D
In any one terminal board input channel by the connection of two conducting wires, the wherein anode of measuring instrumentss and terminal board input channel
Positive terminal connection, the cathode of measuring instrumentss are connected with the negative terminal of terminal board input channel, input end daughter board D and mould
The E connection of analog quantity inputting modular unit is connected between analog input module E and controller F by standard CAN bus, and power module G points
Not Tong Guo two power supply lines connect with controller F and analog input module E, to controller F provide 5V direct current supply, to simulation
It measures inputting modular unit E and 24V direct current supply is provided.
As depicted in figs. 1 and 2, the selection method of two analog inputs selection device described above, the first measuring instrumentss A and
Second measuring instrumentss B in real time measures measurement object M, and measured value is respectively the first measured value AV1 and the second measured value
AV2；Controller F sets the first survey for acquiring measuring instrumentss in real time in the period by analog input module E, input end daughter board D
Magnitude AV1 and the second measured value AV2, and assignment is respectively as the first analog input AI1 of two analog inputs and the second mould
Analog quantity inputs AI2；Two analog outputs include: two to select output valve AO, way of output MOD, alarm signal A LM and cut manual ringing
MRE, intermediate parameters are alarm deviation D EV, and the value of alarm deviation is set dynamically according to requirement of engineering by alarm deviation D EV；
The the first analog input AI1 and the second analog input AI2 of two analog inputs respectively to Qua1 and Qua2,
The quality of middle Qua1 reflection AI1, Qua2 reflect the quality of AI2；There are two types of states for quality, are illustrated with Qua1: good quality, corresponding
Qua1=0；Bad quality, corresponding Qua1=1 carry out Quality estimation according to the first measured value AV1 of measuring instrumentss, when the first measurement
The first measured value AV1 that instrument A is provided is beyond after 3-21mA, Qua1=1, when connecing for the first measuring instrumentss and input end daughter board D
Line disconnects or short circuit, Qua1=1, other normal measurements Qua1=0；The judgment method of Qua2 and Qua1 is identical；Two select it is defeated
The quality representation of value AO is QuaAO out, when QuaAO=0 indicates that two select output valve AO for good quality, when QuaAO=1 indicates two choosings
Output valve AO is bad quality；
As long as it is bad quality that the first analog input AI1 and the second analog input AI2 of two analog inputs, which have one,
Or both deviation be greater than alarm deviation when, then warning output ALM be 1；First analog input AI1 of two analog inputs and
When second analog input AI2 is bad quality or is that good quality but the two deviation are greater than alarm deviation D EV, then manual letter is cut
Number MRE is 1；The the first analog input AI1 and the second analog input AI2 of two analog inputs are bad quality or preferably
When quality but the two deviation are more than alarm deviation D EV, two select output valve AO to remain unchanged, and two select the quality Q uaAO of output valve AO
=1；
The selection of two analog inputs has 5 kinds of working methods, respectively the first analog input AI1, the second analog input
AI2, two analog input maximum values, two analog input average values, two analog input minimum values；
1), working method is the first analog input AI1
(1) Qua1=0, two select output valve AO=AI1, QuaAO=0, export as good quality；MOD=1；
(2) Qua1=1, Qua2=0, two select output valve AO=AI2, and QuaAO=0 output is good quality；MOD=2；
(3) Qua1=1, Qua2=1, two select output valve AO to remain unchanged, and QuaAO=1 output is bad quality；MOD is kept；
2), working method is the second analog input AI2
(1) Qua2=0, two select output valve AO=AI2, QuaAO=0, export as good quality；MOD=2；
(2) Qua1=0, Qua2=1, two select output valve AO=AI1, and QuaAO=0 output is good quality；MOD=1；
(3) Qua1=1, Qua2=1, two select output valve AO to remain unchanged, and QuaAO=1 output is bad quality；MOD is kept；
3), maximum value working method
Work as AI1>AI2, two select output valve AO=AI1, and as AI1<AI2, two select output valve AO=AI2；MOD=3；
4), average value working method
It exports AO=(AI1+AI2)/2, MOD=4；
5), minimum value working method
Work as AI1>AI2, export AO=AI2, as AI1<AI2, exports AO=AI1；MOD=5.
If Fig. 3 is that two analog inputs select application schematic diagram, two input analog quantitys are respectively 509-7,509- in figure
8,509-2 indicate the selection of two analog inputs, and 509-9 is analog input switching, and 509-7,509-8 is separately connected 509-2's
AI1, AI2；The I1 of the AO connection 509-9 of 509-2.Two analog inputs select 509-2 to two analog quantity 509-7 of input and
509-8 is selected according to the method for setting, then the output AO after selection is output to the input I1 of 509-9.
Claims (4)
1. a kind of selection method of two analog input selection devices, described device includes the be fixed on measurement object (M)
One measuring instrumentss (A) and the second measuring instrumentss (B), first measuring instrumentss (A) and the second measuring instrumentss (B) respectively with input
Any one terminal board input channel is connected by two conducting wires in terminal board (D), wherein the anode and terminal board of measuring instrumentss
The positive terminal of input channel connects, and the cathode of measuring instrumentss is connected with the negative terminal of terminal board input channel, inputs
Terminal board (D) is connect with analog input module (E), passes through standard CAN between analog input module (E) and controller (F)
Bus connection, power module (G) is connect by two power supply lines with controller (F) and analog input module (E) respectively, to control
Device (F) processed provides 5V direct current supply, provides 24V direct current supply to analog input module (E)；
It is characterized by: the selection method are as follows: the first measuring instrumentss (A) and the second measuring instrumentss (B) are in real time to measurement object
(M) it measures, measured value is respectively the first measured value AV1 and the second measured value AV2；Controller (F) passes through analog input
Module (E), input end daughter board (D) are to set the first measured value AV1 and the second measured value that the period acquires measuring instrumentss in real time
AV2, and assignment is respectively as the first analog input AI1 and the second analog input AI2 of two analog inputs；Two analog quantitys
Output includes: two to select output valve AO, way of output MOD, alarm signal A LM and cut manual ringing MRE, and intermediate parameters are that alarm is inclined
The value of alarm deviation is set dynamically according to requirement of engineering by poor DEV, alarm deviation D EV；
The the first analog input AI1 and the second analog input AI2 of two analog inputs respectively to Qua1 and Qua2, wherein
Qua1 reflects the quality of AI1, and Qua2 reflects the quality of AI2；There are two types of states for quality, are illustrated with Qua1: good quality, corresponding Qua1
=0；Bad quality, corresponding Qua1=1 carry out Quality estimation according to the first measured value AV1 of measuring instrumentss, when the first measuring instrumentss
(A) the first measured value AV1 provided is beyond after 3-21mA, Qua1=1, when connecing for the first measuring instrumentss and input end daughter board (D)
Line disconnects or short circuit, Qua1=1, other normal measurements Qua1=0；Two select the quality representation of output valve AO for QuaAO, when
QuaAO=0 indicates that two select output valve AO for good quality, when QuaAO=1 indicates that two select output valve AO for bad quality；
As long as the first analog input AI1 and the second analog input AI2 of two analog inputs have one for bad quality or
When the two deviation is greater than alarm deviation, then warning output ALM is 1；First analog input AI1 of two analog inputs and second
When analog input AI2 is bad quality or is that good quality but the two deviation are greater than alarm deviation D EV, then manual ringing is cut
MRE is 1；The the first analog input AI1 and the second analog input AI2 of two analog inputs are bad quality or equal preferably matter
When amount but the two deviation are more than alarm deviation D EV, two select output valve AO to remain unchanged, and two select the quality Q uaAO=of output valve AO
1；
The selection of two analog inputs has 5 kinds of working methods, respectively the first analog input AI1, the second analog input AI2,
Two analog input maximum values, two analog input average values, two analog input minimum values；
1), working method is the first analog input AI1
(1) Qua1=0, two select output valve AO=AI1, QuaAO=0, export as good quality；MOD=1；
(2) Qua1=1, Qua2=0, two select output valve AO=AI2, and QuaAO=0 output is good quality；MOD=2；
(3) Qua1=1, Qua2=1, two select output valve AO to remain unchanged, and QuaAO=1 output is bad quality；MOD is kept；
2), working method is the second analog input AI2
(1) Qua2=0, two select output valve AO=AI2, QuaAO=0, export as good quality；MOD=2；
(2) Qua1=0, Qua2=1, two select output valve AO=AI1, and QuaAO=0 output is good quality；MOD=1；
(3) Qua1=1, Qua2=1, two select output valve AO to remain unchanged, and QuaAO=1 output is bad quality；MOD is kept；
3), maximum value working method
Work as AI1>AI2, two select output valve AO=AI1, and as AI1<AI2, two select output valve AO=AI2；MOD=3；
4), average value working method
It exports AO=(AI1+AI2)/2, MOD=4；
5), minimum value working method
Work as AI1>AI2, export AO=AI2, as AI1<AI2, exports AO=AI1；MOD=5.
2. selection method according to claim 1, it is characterised in that: the controller (F) sets the period as 50 milliseconds
Integral multiple.
3. selection method according to claim 1, it is characterised in that: first measuring instrumentss (A) and the second measuring instrument
Table (B) is all made of 4-20mA two-wire system measuring instrumentss.
4. selection method according to claim 1, it is characterised in that: the input end daughter board (D) includes that 8 terminal boards are defeated
Enter channel, it is defeated to be respectively designated as first end daughter board input channel (DC1), second end daughter board input channel (DC2), third terminal plate
It is logical to enter channel (DC3), forth terminal plate input channel (DC4), the 5th terminal board input channel (DC5), the input of the 6th terminal board
Road (DC6), the 7th terminal board input channel (DC7) and the 8th terminal board input channel (DC8), each terminal board input channel packet
Containing two binding posts, one is positive terminal, another is negative terminal；The analog input module (E) includes 8
It is defeated to be respectively designated as the first module input channel (EC1), the second module input channel (EC2), third module for module input channel
Enter channel (EC3), the 4th module input channel (EC4), the 5th module input channel (EC5), the 6th module input channel
(EC6), the 7th module input channel (EC7) and the 8th module input channel (EC8)；Input end daughter board (D) and analog input
Module (E) is connected by the DB37 line of standard, and the connection relationship between channel is first end daughter board input channel (DC1) and first
Module input channel (EC1) connection, second end daughter board input channel (DC2) is connect with the second module input channel (EC2), with this
Analogize, the 8th terminal board input channel (DC8) is connect with the 8th module input channel (EC8).
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