INTEGRATIONWITHCONTROLLOGIXPROGRAMMABLE ...

1 INT EGR AT ION WIT HCO NTROLLO GI XPROG RA MMA BL EAU TOMATION CONT ROL LERS (PAC S)USING ET HE RNE T/I PCo nc ep ts and Pri nc ip les of Eth erNet/IP Co mmunicat ion wi thRo ckwe ll Au tomat io n Prod uctsAuth ors :Vive k Haj arn av is , Ric har d Piggi n, Ray Ro mi to, Vik to r Sc hi fferVe rs ion 1. 0Co nt entsIntr oduc tion3 Exp licit Mes sagi ng3 Use of CI P Rout ing4 Dat a Org aniz at ion in the Contr ol ler4 Outbound Expl ic it Mes sa ge s5In bo und Exp li cit Me ssag es7 Exp licit Mes sag e Resp onse Time s8I/O Me ss agi ng8Fu rther de sig n con side rations18 Ether Ne t/I P communica ti on wi th Ad d-OnIns tructi on s19 Intr oduc tion Why Add-OnInstruc ti on s?

2 20Ge ne ric ben efit s of Add-OnInstruc tion s22 Cre ating an AO I24 Steps to buil di ng an AOI26 Integ ratio n wit h Fact or yTal k Vi ew soft war e27 Appe nd ix A Acce ssing Ta gs in a Log ix Controller29Gl oss ary30 Ref er en ces31 Dev el op er Re sources32IN TE GR ATIONWITH CO NTROLLOG IX PROGRAMMA BLE AUTOMATIO N CON TRO LLER S (PACS) usingethernet /IP3 Int ro du ct io nManyRoc kw el l Aut om ation pr oduc ts sup port communi ca tion vi a Eth erNet /IP ;how eve r, the type of communi ca ti on it supp orts and th e det ai ls of the communicationvary fro m pr oductto product.

3 The CIP Net worksLi brary from ODVA(Op enDeviceNet Ven dor Association ) provi de s deta iled information ab out Et herNet /IP andthe spec if icat ion s that de fine CommonIndus tr ia l Prot ocol (CIP)as well as its ada ptat ionto var io us ne twor k pr otocols. What is commonly refer red to as t he Eth erNet /IPSp ec ific ation comprises tw o volume s (se e refer ences[8 ] and [9 ]) of th is se ven-v olum elibrar l Ether Net/I P-en abl ed prod uc ts sup port th e minimum expli ci t messaging ser verfu nc tio nal ity by al lo wi ng exp lic it me ssa gi ng accessto ID Objectand oth er requiredobje ct s.

4 Although usefulto ide nti fy a pr od uct , th is communica ti on is not th e cor ere quir em ent of an ind ustrialappl icat ral guidedoc uments(se e re fere nce s [1 ] thr oug h [6 ]) det ai l th e communi ca tion wit hRockw ell Au tom at ion product s. This doc umentdoe s not aim to replaceth ese guid es, bu tinte nds to hi ghl igh t the communica ti on r more in for mat ion ab out the CommonInd ustr ia l Prot ocol and Et her Ne t/IP, plea sere fer to the the CIP eTrain ing Clas sroomTM [1 0], an ins truc tion al CD designedto helpdeve lo pe rs un derst and an d app ly the fun dame nt als of the CommonIndus tr ia l CD provides a cost -e ff ect ive al ter nat iv e to trad it ion al tra ining and can assi st inprod uct deve lopment an d re duc ing ti me to mar ket.

5 For an intr oduction to Et herNet/IPinte rface deve lopment, the ODVA guid e to Eth erNet /IP de velop me nt [11] provi des aco mpl ete bac kg roun d to Ethe rNe t/I P along wi th step s to followfor a successfuldeve lo pme ci t Mes sa gin gBef ore the CIP con cepts were mad e pub lic, a rangeof legacyprod uc ts were dev el op ed .Al though these prod ucts ar e true expl icit messaging ser vers (and sometimescl ient s aswel l), they use spe ci al , old er prot oco l me chani sms such as PCCC(see [5] ), meaning theyco mmun ic ate through a ve nd or-sp ecific object usingobject-speci fi c ser vi ces.

6 Th e da tapo rtio n of th e expl ic it me ssa ge cont ai ns add iti ona l add ress informati er pr oduc ts, espe cia ll y thosewi th in the Log ix fami ly, ar e expli ci t messaging ser verswith ful ly int egrat ed CIP pr in cip les. In or de r to le verage th eir capabili ti es, sev eralprod uct deta ils need to be und ers is the preferr ed met hod of communica tingto thes e pr od ucts .The Log ix familyalso supports th e PCCC encap sula ted messagesto accesscontrollerdata organ ize d in PL C-5 styl e. Ple ase ref er to the Logi x Dat a Accessmanual for detai lsabo ut th is communica ti on me th EGR AT ION WITH CO NTROLLOG IX PROGRAMMA BLE AUTOMATI ON CONT ROL LERS (PAC S) USIN G ETHERNET/I P4 Int rod ucti onExp lic it Me ssa gi ngUse of CI P Rou tingFigure 1 Gen eral Pri nc ip le of a Lo gix Sys temAs shownin Fi gur e 1, a Logi x sys te m is modularin natur e, wi th modulessi tting in aphysic al an d/or log ica l chassis,also calle d a rack.

7 Mod ules in a rack communicat e us ingCIP as imp leme nt ed on a back pl an e bus . Net wor k communicat ions mod ul es ( .DeviceNet , ControlNe t or Et he rNe t/I P) allow pr ocessormod ules in the rack toco mmun ic ate wit h the outsideworl d via CIP mmun icat ion modules are not an int eg ral part of any pr ocessors(at leas t notlo gic al ly), mean ing tha t al l communi cat ion fr om th e ou tsid e wor ld int o a proces sor, andvice ver sa, mus t use the routi ng pr inciples built into CIP. Thesepr inci ple s stat e thatproce sso rs shoul d me ssa ge acr os s rou ted connections or thr oug h th e Unconnect ed Sendse rvice,whi ch car rie s at least on e port seg communica te wi th a Logi x sy stem, aro ute d ex pl ic it me ssa ge (Un con ne cte d Se nd or Forw ard Open) must cont ain a portseg me nt ident if yi ng the bac kplan e port (1 ) and the slot numberof th e mod ule to bere ac hed.

8 Al l typi cal CIP pr in ciples ap ply insid e th e ind ivi dua l mod ules of the Log ixsys a Or gan iz ati on in the Co ntrol lerLog ix proce ssor s st ore an d org an iz e all dat a rele vant to th e ou tsi de wor ld in tag s wh oseuse r-de fi ne d name s have mean ing in the contr ol ap pli ca gs hav e the fo llo wing pr ope rti es : A nam e wit h up to 40 characte rsOn e of tw o scope s: Cont rol ler (i. e. gl ob al) scop e is acce ssib le by ext ern al means Pr og ram ( . loca l) scopeis not acces si ble by ex tern al meansA de fi ne d data ty pe for organizat ion al pur poses : Ato mic BOOL , SIN T, INT , DI NT, REAL Thes e typ es foll ow the data de fini ti on s in CIP; not e tha t Log ix does not supp ort allCIP -def in ed type s.

9 Se e Appen dix C of re ference[8 ] for det ai ls Struc ture s This gro up ing of at omic dat a it ems fun cti ons as a singleunit for a speci fi c purp ose;struc tu res can be pred ef in ed (eg : TIMER, COUNTER,CONTROL) or user-def in ed (eg: UD Ts)IN TE GR ATIONWITH CO NTROLLOG IX PROGRAMMA BLE AUTOMATIO N CON TRO LLER S (PACS) usingethernet /IP5 Use of CIP Ro utingDa ta Or ga ni zat ionin th e Co ntr ol lerArr ay s A seque nce of eleme nts of the same da ta ty pe can be one, two or three dimensional;arr ay me mbe rs can be atomic or struc tur esThe de tail s of cr eat ing and usi ng tags ar e beyond th e scop e of this fer en ce [7] for furt her de tai ls.

10 For inf or ma ti on abou t how to acces s tags, pleaseread thechapterenti tl ed, Appe nd ix A -- Acces si ng Tags in a Lo gix Contr oller. Ou tbo und Expl ic it Me ss agesThe MSG (mes sag e) instruction han dles all Explicit messaginginit ia ted by a Log ixCo ntr oll er pro gram . To utilize con nected or unconnectedmessaging, th e user confi guresMSG ins truct ion. A later sect ion wi ll ad dre ss ho w con nectedmessaging can be cached to keep the conn ection ope 2 Lo gix5 000 MSG Ins truc ti on Message Configura ti onCIP Services that are di re cte d to war ds da ta structured into objectscan be ch osen byse le cti ng C IP gen eric mes sa gi ng.