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17:33, EET
January 6, 2015
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Hello
How can i create an new item, that is requested from a OPC-Client. Is there a event that are triggered?
My idea are, the client give me the item-name, and my OPC-Server should add the new item with this name!
For an Exampel:
the OPC-Client are requesting the follow OPC-Item: “KSA.DB200.DBW0”
Now the OPC-Server should add this to the variable list
May somebody can give me a hint!
Thanks
Gregor
9:26, EET
December 21, 2011
Offline
You can use TPsOPCProvider.OnFindItem event for that.
If an item already exists, it is provided as Component for the event handler. If it is nil, you can create a new item and return that one back as Component.
12:37, EET
January 6, 2015
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Jouni Aro said
You can use TPsOPCProvider.OnFindItem event for that.
If an item already exists, it is provided as Component for the event handler. If it is nil, you can create a new item and return that one back as Component.
Hello Jouni
Thanks for your answer, thats exactly what i need!
Gregor
13:20, EET
January 6, 2015
Offline
Hello Juoni
How can i create a OPC-Item, that are has the datatyp SmallInt
When i use TPsInteger, it will create a “Long Integer” at the client side.
And i also want to create a Array of SmallInt. There is a Object called TPsByteArray, but this will create not that what i want!
Thanks
Gregor
14:21, EET
December 21, 2011
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gkobler said
How can i create a OPC-Item, that are has the datatyp SmallIntWhen i use TPsInteger, it will create a “Long Integer” at the client side.
And i also want to create a Array of SmallInt. There is a Object called TPsByteArray, but this will create not that what i want!
Prosys Central only uses “major” data types in the variables, so it is not possible to create SmallInt items. There is no real requirement to save memory with alternative data types. The client can, however, request data as SmallInt (using OPC Item DataType/RequestedDataType) and the OPCProvider will do the required conversions. I am not sure how the arrays will convert, though.
8:09, EET
January 6, 2015
Offline
Jouni Aro said
gkobler said
How can i create a OPC-Item, that are has the datatyp SmallIntWhen i use TPsInteger, it will create a “Long Integer” at the client side.
And i also want to create a Array of SmallInt. There is a Object called TPsByteArray, but this will create not that what i want!
Prosys Central only uses “major” data types in the variables, so it is not possible to create SmallInt items. There is no real requirement to save memory with alternative data types. The client can, however, request data as SmallInt (using OPC Item DataType/RequestedDataType) and the OPCProvider will do the required conversions. I am not sure how the arrays will convert, though.
Hello Jouni
Thanks for it, i think i got what i want. It’s not in matter to save space. But the Siemens-OPC-Server makes thes Datatypes, when he creates his OPC-Items.
I have made a heredity of the type TPsInteger and changed the datatype to SmallInt, and i did it also with TPsByteArray.
Regards
Gregor
9:55, EET
December 21, 2011
Offline
OK, yes I did not pay attention to the “client side”. But note that Sentrol will convert data types automatically, as it normally does not matter that much any more on the client application what the original data type was. I think TPsFloatArray should also work with SmallInt arrays.
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