Avatar

Please consider registering
guest

sp_LogInOut Log In sp_Registration Register

Register | Lost password?
Advanced Search

— Forum Scope —




— Match —





— Forum Options —





Minimum search word length is 3 characters - maximum search word length is 84 characters

sp_Feed Topic RSS sp_TopicIcon
Read ExtensionObject / byte array
January 20, 2017
14:24, EET
Avatar
MartinAnd
Member
Members
Forum Posts: 6
Member Since:
November 10, 2016
sp_UserOfflineSmall Offline

Hello!

Trying to understand how and if the API can be used for the following task:

A built in OPC-server in a Siemens PLC returns an ExtensionObject when reading a certain node. This node has in turn descendants, (but also a value?). Is it possible to read this value as a byte array rather than browsing down to its components and reading these individually.

Looking at the same node from another OPC client we see a byte array!

//BR Martin

January 23, 2017
13:26, EET
Avatar
Heikki Tahvanainen
Member
Members
Forum Posts: 402
Member Since:
April 17, 2013
sp_UserOfflineSmall Offline

Hello,

An ExtensionObject is a container for any Structured DataType. So, the server is sending a structure and optimally your client application should decode the value as a structure.

If you really want to just obtain the byte array representation of the structure, then you can call ExtensionObject.getObject() method.

If you have the structure type definition available as a UaNodeSet XML file, then you can use the code generator of the Java SDK. This makes using the structure type in your Java code easier.

Forum Timezone: Europe/Helsinki

Most Users Ever Online: 1919

Currently Online:
32 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Top Posters:

Heikki Tahvanainen: 402

hbrackel: 144

rocket science: 88

pramanj: 86

Francesco Zambon: 83

Ibrahim: 78

Sabari: 62

kapsl: 57

gjevremovic: 49

Xavier: 43

Member Stats:

Guest Posters: 0

Members: 730

Moderators: 7

Admins: 1

Forum Stats:

Groups: 3

Forums: 15

Topics: 1529

Posts: 6471

Newest Members:

HypromeImpupe, toneylapham544, rondawolinski7, Marypof5711, roycedelargie91, kourtneyquisenbe, ellis87832073466, zkxwilliemae, gabriellabachus, Deakin

Moderators: Jouni Aro: 1026, Pyry: 1, Petri: 0, Bjarne Boström: 1032, Jimmy Ni: 26, Matti Siponen: 349, Lusetti: 0

Administrators: admin: 1