CN103176448A

CN103176448A - Digital controller

Info

Publication number: CN103176448A
Application number: CN2013100385461A
Authority: CN
Inventors: 温涌文
Original assignee: BEIJING HENGYE CENTURY TECHNOLOGY Co Ltd
Current assignee: BEIJING HENGYE CENTURY TECHNOLOGY Co Ltd
Priority date: 2013-01-31
Filing date: 2013-01-31
Publication date: 2013-06-26
Anticipated expiration: 2033-01-31
Also published as: CN103176448B

Abstract

The invention discloses a digital controller which comprises a local controller, a front-end controller and a front-end measurement and control point. A PID (proportional integration differentiation) algorithm is adopted for the local controller, and a language parser and a code executor are built in the local controller, so that closed-loop control for a system is implemented. The digital controller has the advantages of simple structure, precision in control and high reliability.

Description

A kind of digitial controller

Technical field

The present invention relates to building control technology field, particularly relate to a kind of digitial controller.

Background technology

At present, in the building control field, digitial controller is the on-the-spot DDC controller mainly for automatic building control system, is applicable to central air conditioner, refrigeration plant, heat exchange, plumbing, supply and exhaust, the control of the systems such as illumination.But there are the defectives such as complex structure, reliability be low in present digitial controller.

Summary of the invention

The purpose of this invention is to provide a kind of simple in structure, control accurately, digitial controller that reliability is high.

For achieving the above object, technical scheme of the present invention provides a kind of digitial controller, comprising:

Local controller, front controller and front end measuring control point, wherein local controller adopts pid algorithm, and built-in language parser and code actuator are realized the closed-loop control to system.

Further, local controller adopts the mode of motherboard+daughter board, consists of in conjunction with power distribution cabinet, upward connects central control computer by Ethernet, lower connection front controller and front end measuring control point.

Further, front controller is connected with local controller through the CAN network.

Further, front controller comprises general purpose controller and nonshared control unit.

Further, each is 16 input and output points general purpose controller, is consistent with local control panel port mode; Nonshared control unit comprises 16 ports or 8 ports.

Further, the front end measuring control point is connected with local controller through 485 networks.

Further, the front end measuring control point is designed primarily to sensor or actuator; Each front end measuring control point is supported at most 4 physical ports.

Further, local controller connects at most 4 front controllers, 8 front end measuring control points.

Further, local controller has built-in language parser, is responsible for character code is translated into the machine code of execution; The code actuator is responsible for carrying out the machine code of being completed by language parser, according to the process of single step run, and the completion code task.

Further, the code actuator comprises:

The routine execution module is carried out concrete single step code;

The routine suspends module is responsible for the task routine that does not temporarily need to move is hung up, and gives the operation slot milling of other routines;

Routine is recovered module, according to system's needs, recovers the routine operation that is suspended;

The routine relating module is processed calling and the relation of being called between routine;

The overtime module of routine is abandoned the routine that overtime limits;

Communication module between course is processed the communication cooperation between each routine.

Technique scheme has following advantage:

Digitial controller of the present invention is simple in structure, control is accurate, reliability is high.

Description of drawings

Fig. 1 is the structural representation of a kind of digitial controller of the embodiment of the present invention.

Embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.

As shown in Figure 1, the embodiment of the present invention relates to a kind of digitial controller, comprise three parts: local controller, front controller and front end measuring control point, wherein local controller adopts PID(Proportion Integration Differentiation, proportion integration differentiation) algorithm, built-in language parser and code actuator are realized the closed-loop control to system.

1, local controller

Connect central control computer by Ethernet, so that be connected with Regional Operations Center by telecommunication network, can connect maximum 4 front controllers by the CAN network; Can connect 8 front end measuring control points by 485 networks.Every local controller is all supported 16 input and output points (input and output of port can have the Multiple Combination pattern), and local controller is maximum 128 physical points (local controller+front controller+front end measuring control point) of supporting in logic.Local controller is the master controller of system, adopts the mode of motherboard+daughter board, consists of upper connection Ethernet, lower connection front controller and front end measuring control point in conjunction with power distribution cabinet.

2, front controller

Through CAN(Controller Area Network, controller local area network) network is connected with local controller.Front controller comprises general purpose controller and nonshared control unit; General purpose controller (traditional field controller) is conceived to the convenience to the port expansion of local controller, and each is 16 input and output points general purpose controller, is consistent with local control panel port mode.Nonshared control unit is conceived to the control more professional to system, controls cost thereby further reduce, and the generalization that tightens control.Nonshared control unit can comprise 16 ports or 8 ports, determines according to real needs.Front controller is replenishing of local controller, and function is equivalent to the daughter board in local controller, but can move at a distance through the CAN network as required, thereby realizes the needs of wiring nearby.

3, front end measuring control point

Be connected with local controller through 485 networks.The front end measuring control point is designed primarily to sensor or actuator; Such as Temperature Humidity Sensor, switch reference mark, valve actuator etc.Each front end measuring control point is supported at most 4 physical ports.Thereby back-up system is realized convenient expansion cheaply.The front-end control point is replenishing of local controller, connects through 485 buses, and the one, can realize connecting up nearby, the 2nd, with low cost.

Local controller has built-in language parser, be responsible for character code is translated into the machine code (its process duplicates in the translation resolving of JAVE server to character code) that can carry out, machine code can be transferred to the code actuator and carry out, thereby completes the control target of configuration program expection.

The code actuator is responsible for carrying out the resolving code of being completed by language parser, according to the process of single step run, and the completion code task.

The code actuator comprises: routine execution module, routine suspends module, routine are recovered communication module between module, routine relating module, routine timeout treatment module, routine.

The local controller maximum can be supported 1024 task routine.

The routine execution module is carried out concrete single step code;

Routine is recovered module according to system's needs, recovers the routine operation that is suspended;

The overtime module of routine is abandoned the routine of overtime restriction;

Between course, communication module is processed the communication cooperation between each routine.

The code actuator specifically comprises following content:

One, type of foundation:

1), scale-of-two control point DI, DO port, virtual boolean: Boolean;

00..01:1 byte.00 is off, False, and shutdown stops etc.; 01 is on, True, and start starts etc.;

2), analog quantity control point AI, AO port, virtual floating-point: Single, floating number 4 bytes have symbol;

3), digital quantity: Integer, integer, 1 byte Byte is without symbol, 2 byte WORD are without symbol, 4 byte Integer have symbol (native system adopts 4 byte shapings);

4), the schedule time: clock type+time on date; Use 1 second least unit time in system call routines;

Time on date: 8 bytes, wherein the 1..2 byte is year, subsequent byte be respectively the moon, day, week, the time, minute, second;

Clock type: 1 byte.00: invalid, 01: once timing (correct time), 02: minute cycle (specifying second);

03: the time cycle (appointment every minute and second), 04: diurnal periodicity (appointment Hour Minute Second), 05: cycle (specifying all Hour Minute Seconds);

06: month cycle (appointed date Hour Minute Second), 07: annual period (specifying a month day Hour Minute Second), 08: the User Defined cycle period, unspecified numeral is invalid;

When the clock type is 08, the User Defined control cycle, take second as unit, it is periodicity that last 4 bytes of time on date have symbol integer value, low level is front.

Two, concept classification:

1, system type

0): the unknown;

1): the system of cooling plant;

2): the system of heat exchange station;

3): decide air quantity air-conditioning unit;

4): the air quantity variable air conditioner unit;

5): new blower fan group;

6): the supply and exhaust unit;

7): water supply system;

8): unwatering system;

9): public lighting system;

2, product type

0): the unknown;

1): controller;

2): sensor;

3): actuator;

3, parameter type

0): the unknown;

1): Boolean type;

2): integer;

3): floating type;

4, graph style

0): static graphics (.bmp);

1): animated graphics (.gif);

2): bifurcation figure (.gif front cross frame);

5: port type

0): XX(is unknown);

1): the input of DI(numeral);

2): the output of DO(numeral);

3): the AI(analog input);

4): AO(simulates output);

5): the virtual boolean of VD();

6): the virtual floating-point of VA();

7): the two DO ports of DD();

8): VN(integer port);

6; Numerical value unit

0): the unknown;

1): temperature: ℃;

2): ratio: %;

3): pressure: Pa;

4): flow: M/h;

5): frequency: Hz;

6): illumination: lm;

7): Jiao Er: J;

8): voltage: V;

9): electric current: A;

10): electric degree: KW/h;

11): the time: H;

12): number of times: T;

7: the port signal type

DI:0 is unknown, 1 directly input, 2 relays, 3 optocouplers, 4 triodes;

DO:0 is unknown, 2 relays, 3 controllable silicons, 4 triodes;

AI:0 is unknown, 1 voltage 0-10V, 2 voltage 0-5V, 3 electric current 0-20mA, 4 resistance PT1000;

AO:0 is unknown, 1 voltage 0-10V, 2 electric current 0-20mA;

8: the routine type

0): the unknown;

1): conventional routine;

2): normal routine;

3): schedule routine;

9: alarm level

0): need not report;

1): normal traffic;

2): common warning;

3): the serious warning;

Three, code syntax:

Logical operator: logical and (﹠amp; ﹠amp; ), logical OR (||);

Arithmetic operator: add (+), subtract (-), take advantage of (*), except (/);

Comparison operator: equal (==), be not equal to (unequal to), less than (＜), greater than (〉), less than or equal to (＜=), more than or equal to (〉=); It is all below binary operator.

Priority operator: round bracket (), bracket [].Priority has level Four: (), and */,+-, [].

Logic NOT replaces with being constantly equal to 00.As: non-a replaces with a==00.A equals non-b, uses a=(b==00) replace.

The control object type indicator:

Form is equivalent to array variable, and designator is capitalization.As follows:

1: port parameter: 4 bytes.

Form: PT[X].

PT represents the port type designator, port type:

The two DO of the virtual floating-point/7:DD of the virtual boolean/6:VA of 1:DI/2:DO/3:AI/4:AO/5:VD are virtual is AO/8:VN virtual cosmetic surgery port.

X is subscript (1..255), port sequence number, integer value.The whole meaning is port current state or numerical value.

As run time version VA[13]=12345.60[0] #, expression is that 13 virtual floating-point port assignment is 12345.60 to sequence number;

Run time version AO[3]=VA[13] [50] #, with AO[3] current value be rewritten as VA[13] current value 12345.60, the time-delay 50 unit interval;

Run time version DO[10]=DI[5] ﹠amp; ﹠amp; DI[8] [30] #, with DI[5] ﹠amp; ﹠amp; DI[8] operation result is assigned to DO[10], 30 unit interval of time-delay.

If directly use the PT directive, such as PT[12], refering in particular to is setting value or the desired value of the 12nd port, is usually used in servo-actuated setting.

As: run time version PT[15]=21.00[0] #, expression is 21.00 to the setting value assignment of the 15th port.

Before assignment, DDC should inquire about voluntarily port type and change respective type again and carry out assignment.

And for the reading of physics [PT], be equivalent to read working time or number of run (switching value is working time, and analog quantity is working time) when front port.

Such as: VA[129]=PT[12], if this port is switching value, what read is exactly working time (second), is that analog quantity is number of run.

2: duty parameter: 1 byte.The Byte type

Form: HP[X].

Unit operating mode (00 normal 01 cooling 02 heat supply 03 transition); X is subscript, and expression system or unit sequence number, scope are a DDC jurisdiction unit quantity (1..4);

3: customer parameter: 4 bytes.

Form: UP[X, T].

X is subscript, integer value, customer parameter serial number range (1..128).

T represents value type (1..3): 1 Boolean type, 2 integers, 3 floating types.4 bytes, integer and floating type have symbol.

Boolean is got lowest order (the 1st byte) 1 byte.

As run time version UP[12,2]=12032[20] # is 12032 integer numerical value with 4 byte assignment of the 12nd customer parameter.

Run time version AO[12]=UP[100,3] [20] #, with AO[12] the current value assignment is 4 byte floating numbers of the 100th customer parameter.

4: routine parameters: 1 byte.The Bool type

Form: EP[X], FP[X], PP[X].X is routine sequence number (1..1023), is integer expresion;

EP: activation command, as EP[X]=00[0] #, cancel and activating; EP[X]=01[0] #, activate X routine.

FP, PP: fill order.Difference is, FP is the execution that the execution (being equivalent to call function) of returning to breakpoint is arranged, and an execution thread is equivalent to dish out.

As FP[X]=DI[5] ﹠amp; ﹠amp; DI[6] [0] #, or PP[X]=DI[5] ﹠amp; ﹠amp; DI[6] [0] #, if expression formula DI[5] ﹠amp; ﹠amp; DI[6] result is 00 and does not carry out, and is 01 execution.

As: run time version EP[12]=00[10] #, No. 12 the routine state of activation is set to off;

Run time version EP[12]=01[20] #, No. 12 the routine state of activation is set on, and this routine is activated;

Run time version FP[12]=DI[5] [20] #, if DI[5] for very carrying out routine No. 12, and just begin to carry out follow-up code after executing;

Run time version PP[12]=DO[4] [60] #, if DO[4] for very carrying out routine No. 12.

Annotate: these four kinds of objects, both can be used as an element value in expression formula, also can be the assignment of object own.Can be considered a variable.

Subscript X does not allow nested layer by layer.Such as port expression formula AO[AI[3]] etc. illegal.

5: algorithmic procedure: 4 bytes.

Form: PID(PT[X], X1, X2) [T].

All algorithms are all used this form.Can support altogether 5 kinds of algorithms, the 1st kind is pid algorithm.

PT[X in formula] be input port, may be AI or VA port, the goal-setting value of algorithm is the goal-setting value of input port.

X1, X2 are the integer values, and X1 is algorithm sequence number (1..5), and X2 is this algorithm parameter group number (1..12).[T] is time-delay, and in algorithmic procedure, the T perseverance is 0 invalid.

Algorithmic procedure generally is placed in conventional routine and carries out, and can be considered the band ginseng process of regulating to output port tactic numerical value.

As: run time version AO[10]=PID(AI[5], 1,5) and [0] #, expression is to output port AO[10] and carry out pid algorithm, quote the 5th group of pid parameter.

6: pre-defined function: 4 bytes.

Form: FUNC(T, X1..Xn).

Predefine operating function: T is function code name (0..255 supports at most 255 built-in functions on Systems Theory, be the support in controller), and X1-XN is design parameter, and number of parameters is no more than 8.

T=1, calculating mean value (AVE), X1..Xn are 4 byte floating-point numerical value, and maximum 5 numerical value return to 4 byte floating point values.

As FUNC(1, AI[5], AI[6]+3.25), calculate AI[5] and AI[6]+3.25 mean value, return to floating number.Following T=2..4 expression argument type is identical.

T=2 calculates and value (SUM);

T=3, calculated minimum (MIN);

T=4 calculates maximal value (MAX);

T=5 calculates absolute value (ABS), is with 1 floating point expression formula parameter, returns to floating number.As FUNC(5, AI[3]+20.50), expression is with AI[3]+20.50 take absolute value.

Assignment/executable expressions:

Form: Y=operation expression+[T] #.But Y is output port or call by value parameter, and T is time-delay.

Assignment/executable expressions example.

1, DO/VD/ customer parameter:

Indirect assignment example: DO[X]=01[20] #;

Compose expression formula example: VD[X]=(DI[X1] unequal to DI[X2]) || (DI[X3]==01) [50] #;

2, AO/VA/DD/ customer parameter:

Indirect assignment example: AO[X]=12.65[100] #;

Compose expression formula example: VA[X]=AI[X1]+AI[X2]-AI[X3]/AI[X5]+FUNC(2, AI[X3], AI[X4] and, VA[X5])+6.35[20] #;

Compose expression formula example: DD[X]=AI[X1]+AI[X2]+UP[X3,3]+3.56[60] #;

Algorithmic code example: AO[X]=PID[AI[X1], X2, X3] and [0] #, execution algorithm, the general time is invalid.The code of algorithmic procedure must account for delegation.

Routine activates example: EP[X]=HP[X1] ﹠amp; ﹠amp; VD[X2] || DI[X3] [0] #, activate routine, the general time is invalid.

Customer parameter is composed the expression formula example: UP[5,3]=(AI[X1]+AI[X2])/2[0] #.

Executable expressions refers to assignment or control output to output port, and output port comprises physics output port and virtual port.

Control output by the expression formula result.

Because its operating process may need a period of time, so there are the form [T] of specifying delay time, second unit interval in delegation's run time version capable end.

Need a period of time such as valve opening being transferred to certain number percent.Every line code afterbody is separated with ' No. #'.An algorithmic procedure is considered as delegation's run time version.

Some code examples commonly used:

During the cooling operating mode, the 2nd unit activates the 3rd routine: EP[3]=HP[2]==01[0] #;

During the cooling operating mode, the 2nd unit eliminated state of activation: EP[4 with the 4th routine]=HP[2] unequal to 01[0] #;

During for thermal condition, the 1st unit activates the 20th routine: EP[20]=HP[1]==02[0] #;

According to condition return and carry out the 3rd routine: FP[3]=DI[2] ﹠amp; ﹠amp; DI[4] ﹠amp; ﹠amp; (AI[25]〉32.00) [0] #;

According to condition carry out the 3rd routine: PP[3 without returning]=DI[2] ﹠amp; ﹠amp; DI[4] ﹠amp; ﹠amp; (AI[25]〉32.00) [0] #;

Compose floating point values: UP[35,3 for the 35th customer parameter]=AI[50]+AI[63] [0] #;

Compose floating point values: AO[45 for the 45th AO port]=AI[32]+UP[35,3] [50] #;

Four, port trigger event

DI/DO/VD: when becoming on by off (executive routine sequence number 01),

When becoming off by on (executive routine sequence number 02),

When perseverance is off (executive routine sequence number 03),

When perseverance is on (executive routine sequence number 04);

AI/AO/VA/DD: responsive change (the executive routine sequence number 01) of precision,

The high alarm setting (executive routine sequence number 02) that jumps out,

Return high alarm setting (executive routine sequence number 03),

Constraint (deviation) upper limit (executive routine sequence number 04) that jumps out,

Return constraint (deviation) upper limit (executive routine sequence number 05),

Return constraint (deviation) lower limit (executive routine sequence number 06),

Constraint (deviation) lower limit (executive routine sequence number 07) that jumps out,

Return low alarm limit (executive routine sequence number 08),

Low alarm limit (executive routine sequence number 09) jumps out;

VN: during numerical value change (executive routine sequence number 01),

When becoming numerical value 1 (executive routine sequence number 02),

When becoming numerical value 2 (executive routine sequence number 03),

When becoming numerical value 3 (executive routine sequence number 04),

When becoming numerical value 4 (executive routine sequence number 05),

When becoming numerical value 5 (executive routine sequence number 06),

When becoming numerical value 6 (executive routine sequence number 07),

When becoming numerical value 7 (executive routine sequence number 08),

Ordinal number is that 0 expression is without executive routine.

As can be seen from the above-described embodiment, digitial controller of the present invention is simple in structure, control is accurate, reliability is high.

The above is only the preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims

1. a digitial controller, is characterized in that, comprising:

2. digitial controller as claimed in claim 1, is characterized in that, local controller adopts the mode of motherboard+daughter board, consists of in conjunction with power distribution cabinet, upward connects central control computer by Ethernet, lower connection front controller and front end measuring control point.

3. digitial controller as claimed in claim 1 or 2, is characterized in that, front controller is connected with local controller through the CAN network.

4. digitial controller as claimed in claim 3, is characterized in that, front controller comprises general purpose controller and nonshared control unit.

5. digitial controller as claimed in claim 4, is characterized in that, each is 16 input and output points general purpose controller, is consistent with local control panel port mode; Nonshared control unit comprises 16 ports or 8 ports.

6. digitial controller as described in claim 1 or 4, is characterized in that, the front end measuring control point is connected with local controller through 485 networks.

7. digitial controller as claimed in claim 6, is characterized in that, the front end measuring control point is designed primarily to sensor or actuator; Each front end measuring control point is supported at most 4 physical ports.

8. digitial controller as claimed in claim 7, is characterized in that, local controller connects at most 4 front controllers, 8 front end measuring control points.

9. digitial controller as described in claim 3 or 8, is characterized in that, local controller has built-in language parser, is responsible for character code is translated into the machine code of execution; The code actuator is responsible for carrying out the machine code of being completed by language parser, according to the process of single step run, and the completion code task.

10. digitial controller as claimed in claim 7, is characterized in that, the code actuator comprises:

The routine execution module is carried out concrete single step code;

The overtime module of routine is abandoned the routine that overtime limits;