CN103176448B - Digital controller - Google Patents

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 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 is the defects such as complex structure, reliability be low in current digitial controller.

Summary of the invention

The object of this invention is to provide the digitial controller that a kind of structure is simple, control is accurate, 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 executor, realize the closed-loop control to system.

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

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

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

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

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

Further, front end measuring control point is designed primarily to sensor or actuator; Each front end measuring control point supports 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 machine code character code being translated into execution; Code executor is responsible for performing the machine code completed by language parser, according to the process of single step run, and completion code task.

Further, code executor comprises:

Routine execution module, performs concrete single step code;

Routine suspends module, the task routine be responsible for temporarily not needing to run is hung up, to the operation slot milling of other routines;

Routine recovers module, and according to system needs, the routine recovering to be suspended is run;

Routine relating module, calling and called relation between process routine;

Routine timeout module, abandons the routine of overtime restriction;

Communication module between course, processes the communication cooperation between each routine.

Technique scheme tool has the following advantages:

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

Accompanying drawing explanation

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 for illustration of 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 executor, realize 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, maximum 4 front controllers can be connected by CAN network; 8 front end measuring control points can be connected by 485 networks.16 input and output points (input and output of port can have Multiple Combination pattern) all supported by every block local controller, and local controller is maximum support 128 physical points (local controller+front controller+front end measuring control point) in logic.Local controller is the master controller of system, adopts the mode of motherboard+daughter board, forms, 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 expanded the port of local controller, and general purpose controller is each is 16 input and output points, is consistent with local control panel port mode.Nonshared control unit is conceived to the control more professional to system, thus reduction is controlled cost further, the generalization tightened control.Nonshared control unit can comprise 16 ports or 8 ports, determines according to real needs.Front controller is supplementing of local controller, and function is equivalent to the daughter board in local controller, but can move at a distance through CAN network as required, thus the needs that realization is connected up nearby.

3, front end measuring control point

Be connected with local controller through 485 networks.Front end measuring control point is designed primarily to sensor or actuator; Such as Temperature Humidity Sensor, switching control points, valve actuator etc.Each front end measuring control point supports at most 4 physical ports.Thus back-up system realizes the convenient expansion of low cost.Front-end control point is supplementing of local controller, and connect through 485 buses, one is can realize connecting up nearby, and two is with low cost.

Local controller has built-in language parser, character code is responsible for translate into the machine code (its process duplicates in the translation resolving of JAVE server to character code) that can perform, machine code can be transferred to code executor to perform, thus completes the control objectives of configuration program expection.

Code executor is responsible for performing the resolving code completed by language parser, according to the process of single step run, and completion code task.

Code executor comprises: routine execution module, routine suspends module, routine recover communication module between module, routine relating module, routine timeout treatment module, routine.

Local controller is maximum supports 1024 task routine.

Routine execution module performs concrete single step code;

Routine suspends module in charge hangs up, the task routine temporarily not needing to run to the operation slot milling of other routines;

Routine recovers module according to system needs, and the routine recovering to be suspended is run;

Calling and called relation between routine relating module process routine;

Routine timeout module abandons the routine of overtime restriction;

Communication cooperation between course between each routine of communication module process.

Code executor 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, shutdown, stops; 01 is on, True, start, starts;

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

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

4), calendar events: clock type+date-time; Use in system call routines, 1 second least unit time;

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

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

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

06: the cycle moon (appointed date Hour Minute Second), 07: annual period (specifying moon day Hour Minute Second), 08: User Defined cycle period, unspecified digital override;

When clock type is 08, User Defined control cycle, in seconds, last 4 bytes of date-time have symbol integer value to be periodicity, and low level is front.

Two, concept classification:

1, system type

0): unknown;

1): cooling plant system;

2): heat exchange station system;

3): determine air quantity air-conditioner set;

4): air quantity variable air conditioner unit;

5): Fresh air handling units;

6): supply and exhaust unit;

7): water supply system;

8): unwatering system;

9): public lighting system;

2, product type

0): unknown;

1): controller;

2): sensor;

3): actuator;

3, parameter type

0): 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): DO(numeral exports);

3): AI(analog input);

4): AO(modulating output);

5): the virtual boolean of VD();

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

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

8): VN(integer port);

6; Numerical value unit

0): unknown;

1): temperature: DEG C;

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: port signal type

DI:0 is unknown, and 1 directly inputs, 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: routine type

0): unknown;

1): conventional routines;

2): normal routine;

3): schedule routine;

9: alarm level

0): need not report;

1): normal traffic;

2): common warning;

3): seriously report to the police;

Three, code syntax:

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

Arithmetic operator: add (+), subtracts (-), takes advantage of (*), except (/);

Comparison operator: equal (==), be not equal to (unequal to), be less than (<), be greater than (>), be less than or equal to (<=), be more than or equal to (>=); Below be all binary operator.

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

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

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 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 is virtual is AO/8:VN virtual cosmetic surgery port.

X is subscript (1..255), port sequence number, integer value.Whole is meant to port current state or numerical value.

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

Run time version AO [3]=VA [13] [50] #, is rewritten as the current value 12345.60 of VA [13], time delay 50 unit interval by the current value of AO [3];

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

If directly use PT directive, such as PT [12], then 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] #, represents that to the setting value assignment of the 15th port be 21.00.

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

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

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

2: duty parameter: 1 byte.Byte type

Form: HP [X].

Unit operating mode (00 normal 01 cooling 02 heat supply 03 transition); X is subscript, and represent system or unit sequence number, scope is an administrative unit quantity (1..4) of DDC;

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 gets lowest order (the 1st byte) 1 byte.

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

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

4: routine parameters: 1 byte.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] #, cancels and activating; EP [X]=01 [0] #, activates X routine.

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

As FP [X]=DI [5] & & DI [6] [0] #, or PP [X]=DI [5] & & DI [6] [0] #, if expression formula DI [5] & & DI [6] result is 00, not performing, is 01 execution.

As: No. 12 routine states of activation are set to off by run time version EP [12]=00 [10] #;

No. 12 routine states of activation are set on, this routine are activated by run time version EP [12]=01 [20] #;

Run time version FP [12]=DI [5] [20] #, if DI [5] is very, performs No. 12 routine, and just starts to perform follow-up code after executing;

Run time version PP [12]=DO [4] [60] #, if DO [4] is very, performs No. 12 routines.

Note: these four kinds of objects can, as the element value of in expression formula, also can be both 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. are illegal.

5: algorithmic procedure: 4 bytes.

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

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

In formula, PT [X] is input port, may be AI or VA port, and the target set point of algorithm is the target set point of input port.

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

Algorithmic procedure is generally placed in conventional routines and performs, and can be considered the band ginseng process regulated to output port tactic numerical value.

As: run time version AO [10]=PID(AI [5], 1,5) [0] #, represent and pid algorithm is performed to output port AO [10], 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 Systems Theory supports 255 built-in functions at most, is 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 is 4 byte floating-point values, and maximum 5 numerical value, return 4 byte floating point values.

As: FUNC(1, AI [5], AI [6]+3.25), calculate the mean value of AI [5] and AI [6]+3.25, return 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 floating number.As: FUNC(5, AI [3]+20.50), represent and AI [3]+20.50 is taken absolute value.

Assignment/executable expressions:

Form: Y=operation expression+[T] #.Y is output port or can 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], 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] [0] #, execution algorithm, the general time is invalid.The code of algorithmic procedure must account for a line.

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

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

Executable expressions, refer to the assignment to output port or control output, output port comprises physical output port and virtual port.

Carry out control by expression formula result to export.

Because its operating process may need a period of time, so there is the form [T] of specifying delay time at the capable end of a line run time version, second unit interval.

Such as valve opening is transferred to certain number percent and needs a period of time.Every line code afterbody is with ' No. #' separation.An algorithmic procedure is considered as a line run time version.

Some conventional code examples:

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

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

The 20th routine: EP [20]=HP [1]==02 [0] # is activated for the 1st unit during thermal condition;

According to condition return execution the 3rd routine: FP [3]=DI [2] & & DI [4] & & (AI [25] >32.00) [0] #;

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

Floating point values: UP [35,3]=AI [50]+AI [63] [0] # is composed to the 35th customer parameter;

Floating point values: AO [45]=AI [32]+UP [35,3] [50] # is composed to the 45th AO port;

Four, port trigger event

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

When becoming off from (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: precision sensitivity change (executive routine sequence number 01),

Jump out high alarm setting (executive routine sequence number 02),

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

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

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

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

Jump out constraint (deviation) lower limit (executive routine sequence number 07),

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

Jump out low alarm limit (executive routine sequence number 09);

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 0 to indicate without executive routine.

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

The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing 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)

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

Local controller, adopts the mode of motherboard+daughter board, forms in conjunction with power distribution cabinet, on connect central control computer by Ethernet, lower connection front controller and front end measuring control point; Local controller connects at most 4 front controllers, 8 front end measuring control points; Adopt pid algorithm, built-in language parser and code executor, realize the closed-loop control to system; Local controller has built-in language parser, is responsible for machine code character code being translated into execution; Code executor is responsible for performing the machine code completed by language parser, according to the process of single step run, and completion code task; Code executor comprises:

Routine execution module, performs concrete single step code;

Routine suspends module, the task routine be responsible for temporarily not needing to run is hung up, to the operation slot milling of other routines;

Routine recovers module, and according to system needs, the routine recovering to be suspended is run;

Routine relating module, calling and called relation between process routine;

Routine timeout module, abandons the routine of overtime restriction;

Communication module between course, processes the communication cooperation between each routine;

Front controller, is connected with local controller through CAN network; Front controller comprises general purpose controller and nonshared control unit, and general purpose controller is each is 16 input and output points, is consistent with local control panel port mode; Nonshared control unit comprises 16 ports or 8 ports;

Front end measuring control point, is connected with local controller through 485 networks, and front end measuring control point is sensor or actuator; Each front end measuring control point supports at most 4 physical ports.