Ky 7 Ngon Ngu VBS Tren Win Cc

7/22/2019 Ky 7 Ngon Ngu VBS Tren Win Cc

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Chng 4:THIT LP D N SCADA

TRN WinCC


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THIT LP D N SCADA TRN WinCC

Demo Project: H thng trm trn (3)Ging nh h thng trm trn (2) ta thc hin phntrc, by gi b sung tnh nng chy t ng/bng tay(Auto/Manual). Chi tit c m t nh sau:


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THIT LP D N SCADA TRN WinCC Khi switch Auto/Manual chuyn sang v tr Auto th h thng t

ng hot ng theo mt chng trnh ci sn:Ban u Valve A m cht lng A vo bn trong thi gian Ta, Sau ng Valve A, m Vanlve B trong thi gian Tb. Khi ht thi gian ny th ng Valve B, bt Mixer hot ng trong thi gian Tm. Sau tt Mixer v m Valve C thnh phm ra ngoi trong

khong thi gian Tc. Kt thc khong thi gian ny, ng ValveC. Thi gianTa, Tb, Tm hay Tc cho php ci t bi ngi vn

hnh. Khi chy t ng th cc buttons iu khin bng tay khng cn

hiu lc. Khi switch Auto/Manual chuyn sang v trManual th h thng

hot ng ch bng tay nh trong phn 2 thc hin.


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THIT LP D N SCADA TRN WinCC


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Chng 4: THIT LP D N SCADATRN WinCC

Bi 9:

Visual Basic Script trnWinCC


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Visual Basic Script trn WinCC

* Tng quan* Visual Basic Script

* Vit chng trnh cho Project


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Tng quan

Ngn ng lp trnh c tch hp km cc phn mmSCADA tng thm mm do khi k s d n thchin cc yu cu phc tp.

WinCC ver 5. v trc ch h tr C Script, cc phinbn sau ny h tr tt c C Script (CS) v Visual BasicScript (VBS).

Hu ht cc phn mm SCADA khc u s dng VBS.


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Visual Basic Script VBS c s dng trong WinCC tng tnh linh hot

cho chng trnh iu khin gim st bng cch vitcode tc ng n h thng.

VBS c cc khi nim cn lu :+ Module+ Procedure (th tc)+ Action (hnh ng)

Procedure: c dng cha code, mi procedurech cn to mt ln, s dng nhiu ln trong ton bproject. Thay v phi code nhiu ln, ta ch cn giprocudure lin quan. Vi procedure, code s tngminh, v d kim sot.


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Visual Basic Script

Cc procedures c lin quan nhau thng c lutrong cng mt module.

Module: hai loistandard module v project module Standard module: cha cc procedures ton cc cho

cc project. Cc modules ny c lu tr theo a ch:\ApLib\ScriptLibStd\.bmo

Project module: cha cc procedures ring caproject. Cc module ny c lu tr theo a ch:

\ScriptLib\.bmo


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Visual Basic Script

Cc procedures trong mt standard module


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Visual Basic Script

Trong procedures l cc on code chng trnh cvit thc hin mt/nhng nhim v no .

V d:(xem thm phn VBS for creating Proceduresand Actions trong file WinCC Help)

+ c/Ghi gi tr Tag:nh ngha mt binDim objTag Gn bin ny ti tag Set objTag = HMIRuntime.Tags("Tag1")c gi tr ca tag

objTag.Read


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Visual Basic Script

Tng gi tr ny ln 1 n v objTag.Value = objTag.Value + 1Ghi gi tr ny ra tag objTag.Write + Chuyn mu nn ca hnh ch nht c tnRectangle1 trong picture thnh mu :nh ngha mt binDim objRectangleGn bin ny thnh i tng "Rectangle1 trong pictureSet objRectangle = ScreenItems("Rectangle1")Thay i mu nn ca i tng thnh mu objRectangle.BackColor = RGB(255,0,0)


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Visual Basic Script

Action: l hnh ng trong c cha mt hoc nhiuprocedures v c kch hot bi mt s kin trigger nhm thc thi cc on code trong cc procedurescha trong n.


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Visual Basic Script

Cc s kintriggers dng kch hot action trongVBS ca WinCC gm c:timer trigger v tag trigger.

Timer trigger: thc thi mt action ti mt thi im chotrc. Gm hai loi: trigger c chu k (cyclic) v trigger khng c chu k (acyclic).

Tag trigger: thc thi mt action khi c s thay i valueca tag.


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Vit chng trnh cho Project

Trc tin, cn thit k thm cho Mixing_Station picturenh hnh bn di.


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Switch Auto/Manual iu khin tag Auto_Manual nh hnh.Khi Switch Auto th tag ny c gi tr 1, khi switch Manualth tag ny c gi tr 0.


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Vit chng trnh cho Project To thm mt picture c tn Auto_Param chn hn c cc

I/O fields ValveA, ValveB, ValveC, Mixer kt ni tng ngvi cc tags Time_Valve_A, Time_Valve_B, Time_Valve_C,Time_Mixer qui nh thi gian chy t ng cho tng itng.


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Vit chng trnh cho Project Trn picture Mixing_station to thm mtpicture window kt

ni n picture Auto_Param.


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Thm button Config hin hay n picture window ny


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Vit chng trnh cho Project Sau khi thit k hon thin cc trang picture, ta tin hnh vit

VBS cho ch t ng. Trn ca sWinCC Explorer ,click voGlobal Script,mVBS-Editor.


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Ca s Global Script VBS xut hin


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Vit chng trnh cho Project Trong tab Project Modules , to miModule1.bmo.Trong

module1, to mt procedure c tnTag_setting cha chng trnhtc ng v tr hon cho mt i tng tag:

'procedure set gia tri cua Tag len 1 trong 1 khoang thoi gian nhat dinhSub Tag_setting(Byval specified_amount_Tag, Byref Control_Tag)'Khai bao thoi gian bat dauDim start_time'Gan thoi gian hien tai Start_time =Now()'Set bit cua Tag Control_Tag.value=1Control_Tag.write


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'Doc value cua Tag chua khoang thoi gianspecified_amount_Tag.read(1)'Neu hieu so giay cua thoi gian hien tai va thoi gian bat dau >specified_amount thi gan 0 cho Tag While ((Hour(Now())*3600 + Minute(Now())*60 + Second(Now()))-(Hour (Start_time)*3600 + Minute(Start_time)*60 + Second(Start_time)))specified_amount thi gan 0 cho Tag

Control_Tag.value=0 Control_Tag.writeEnd Sub


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Vit chng trnh cho Project Trong Tab Action, to mi mt action1.bac, l hnh

ng chy t ng khi chuyn sang Auto mode:Option Explicit Function action'Khai bao'Cac bien chua trang thai cac valves, mixer

Dim auto'Gan cac bien voi cac Tag tuong ung Set auto= HMIRuntime.Tags("Auto_manual")auto.Read 'Neu Tag auto chuyen tu 0->1 thi chay tu dong

If auto.Value Then


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Vit chng trnh cho ProjectDim Valve_A

Dim Valve_BDim Valve_C Dim Mixer 'Cac bien chua thoi gian trong cac tags thoi gianDim Time_VA

Dim Time_VBDim Time_VC Dim Time_M 'Gan cac bien voi cac Tag tuong ung Set Valve_A= HMIRuntime.Tags("Valve_A")

Set Valve_B= HMIRuntime.Tags("Valve_B")Set Valve_C= HMIRuntime.Tags("Valve_C")Set Mixer= HMIRuntime.Tags("Mixer")


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Vit chng trnh cho ProjectSet Time_VA= HMIRuntime.Tags("Time_Valve_A")Set Time_VB= HMIRuntime.Tags("Time_Valve_B")Set Time_VC= HMIRuntime.Tags("Time_Valve_C")Set Time_M= HMIRuntime.Tags("Time_Mixer")'Tac dong valve A'Mo Valve A torng thoi gian Time_VA giay Tag_setting Time_VA , Valve_A'Tac dong valve B'Mo Valve A torng thoi gian Time_VA giay Tag_setting Time_VB, Valve_B


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Vit chng trnh cho Project'Tac dong Mixer 'Mo Valve A torng thoi gian Time_VA giay Tag_setting Time_M, Mixer 'Tac dong valve C 'Mo Valve A torng thoi gian Time_VA giay Tag_setting Time_VC, Valve_C Else'Neu Tag auto chuyen tu 1->0 thi ngung chay Valve_A.Value 0 ,1Valve_B.Value 0 ,1Valve_C.Value 0 ,1Mixer.Value 0 ,1end If 'Ket thuc End Function


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Vit chng trnh cho Project Cu hnh cho action ny c kch hot khi value ca

tag Auto_Manual thay i: Nhn vo biu tng m info/Trigger Dialog.

Chn Tag Auto_Manual lm Trigger Tag choaction1


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Vit chng trnh cho Project Thm mt yu cu na, khi chuyn mode t Manual sang Auto th kha cc buttons iu khin trn Manual ModeControl Panel.

lm c iu ny, ta khai bo thm 1 tagLock_button iu khin tnh nngOperator-Control Enable.Khi Tagny l 1 th cho php cc buttons iu khin, nu l 0 thngc li


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Vit chng trnh cho Project V khi tag Auto_Manual l 1 (Auto Mode)th tag

Lock_Buttonl 0 v khi tag Auto_Manual l 0(Manual Mode)th tag Lock_Buttonl 1. lm iu ny, ta thm mtaction2 nh sau:

Option Explicit

Function action'Khai Bao bienDim autoDim lock 'Ket noi voi cac Tags tuong ung

Set auto=HMIRuntime.Tags("Auto_manual")Set lock=HMIRuntime.Tags("Lock_button")


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'Doc gia tri cua tag Auto_manual auto.Read(1)'Neu tag Auto_manual la 1 thi tag Lock_button la 0 If auto.Value Thenlock.Write 0 , 1Else'Neu tag Auto_manual la 0 thi tag Lock_button la 1lock.Write 1 , 1End If End Function


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Action ny cng c kch hot khi tag Auto_Manual thay i gi tr.


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Thit lp thuc tnh Runtime cho Project:


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Visual Basic Script trn WinCC Nhn thc thi runtime ca project. Nhn buttonconfig ci t thi gian chy t ng

cho h thng.


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Visual Basic Script trn WinCC Gt switch Auto/Manual sang Auto Mode, h thng s hot

ng t ng theo cc khong thi gian ci t trc. Lcny cc buttons iu khin bng tay trncontrol panel b mi.


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Ti Liu Tham Kho

WinCC User Manual //-------------------------------------

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Ky 7 Ngon Ngu VBS Tren Win Cc