In­ter­net of Things

DEMM Engineering & Manufacturing - - CONTENTS -

Di­rect i nte­gra­tion of

OPC UA Pub/Sub UDP com­mu­ni­ca­tion into the TwinCAT 3 run­time paves the way for straight­for­ward con­fig­u­ra­tion of pub­lish­ers and sub­scribers, as well as ex­change of data in real-time.

With a new ex­ten­sion of the OPC UA spec­i­fi­ca­tion, which Beck­hoff played a prom­i­nent role in help­ing de­velop, the pub­lisher/sub­scriber prin­ci­ple is be­ing in­tro­duced into the estab­lished and stan­dard­ised OPC UA com­mu­ni­ca­tion pro­to­col. Through the early in­te­gra­tion of the Pub/Sub UDP ex­ten­sion, Beck­hoff has emerged once again as an early adopter of OPC tech­nolo­gies.

One par­tic­u­lar ad­van­tage is the much sim­pli­fied con­fig­u­ra­tion re­sult­ing from di­rect in­te­gra­tion into the TwinCAT 3 en­gi­neer­ing en­vi­ron­ment. Com­mu­ni­ca­tion is ini­ti­ated di­rectly from the TwinCAT 3 run­time, cre­at­ing a de­ter­min­is­tic and there­fore real-time- ca­pa­ble com­mu­ni­ca­tion chan­nel via OPC UA.

Ad­van­tages of pub­lisher/sub­scriber com­mu­ni­ca­tion

Con­ven­tional client/server ap­pli­ca­tions are de­cou­pled from one an­other in pub­lisher/sub­scriber- based data com­mu­ni­ca­tion and no longer need to “know” each other. The pub­lisher sim­ply sends its data, as a UDP mul­ti­cast in this case, to a mul­ti­cast group. The sub­scribers re­ceive the data by sub­scrib­ing to the mul­ti­cast group in­stead of the ac­tual de­vice.

These ad­van­tages can be utilised in all ar­eas of ma­chine de­sign, plant en­gi­neer­ing and build­ing au­to­ma­tion tech­nol­ogy. This is es­pe­cially true in M2M sce­nar­ios within ma­chine net­works, for ex­am­ple, in small man­u­fac­tur­ing sys­tems as well as com­plex ma­chines and build­ings.

Ac­cord­ing to the cur­rent roadmap for the OPC UA spec­i­fi­ca­tion, this ex­ten­sion is ex­pected to be fi­nalised by the OPC Foun­da­tion in early 2017. Ac­cord­ingly, Beck­hoff plans a timely prod­uct re­lease in TwinCAT 3.

WITH PC-BASED CONTROL AND TWINCAT 3, BECK­HOFF WILL ONCE MORE ACT AS AN EARLY ADOPTER AND SUP­PORT THE EX­TEN­SION OF OPC UA TO IN­CLUDE PUB­LISHER/SUB­SCRIBER COM­MU­NI­CA­TION.

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