[foxboro] Foxboro - ABB OPC tag issue
- From: <richard.harris@xxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Tue, 26 Mar 2013 18:25:15 +0000
Hi list,
We have a problem with a new OPC project, and I was wondering if anyone has
come across a similar problem (and hopefully solution!).
I'll briefly describe the installation first:
FCP270(FT)
FBM233(FT)
Pair of Foxboro switches
ABB servers (redundant).
Now the problem:
I have configured several test RIN and BIN blocks and these are reading Real
and Boolean OPC tags through successfully.
There is another type of tag used to show a GCC sample time (called
GCC1.STRM1.SampleTime).
I have tried unsuccessfully to connect to this type of tag using RIN, STRIN and
IIN blocks.
I am using aliases via the FDSI configurator to allow for upper/lower case
naming.
Checking the tag data type (using Matrikon OPC explorer), it is declared as
"canonical data type 7".
Looking on the web for this data type:
"It is represented as a 64-bit signed integer which represents the number of
100 nanosecond intervals since Jan 1, 1601"
Now according to the OPC client manual BO700BH : Table 3.6 data Conversions:
IIN Blocks only support 16 or 32 bit integers.
The footnote for the table states:
"64-bit signed and unsigned integers
and LBCD types are not supported."
So the question for the list is has anyone come across this and found a
workaround or solution for this data type mismatch?
Many thanks for any help!
Regards
Richard
Richard Harris,
Systems Engineer
* Dow Corning Ltd
Cardiff Road, Barry, South Wales CF63 2YL
* Voice: +44 (0)1446 723873
* Fax: +44 (0)1446 700874
* E-Mail: mailto:richard.harris@xxxxxxxxxxxxxx
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