National Instruments FieldPoint FP-1600 User Manual page 42

Chapter 3 Hardware and Software Configuration
FieldPoint FP-1600 User Manual
the names given in FieldPoint Explorer. For example, an Item ID
associated with one of the I/O Items shown in Figure 3-3 would be
FP Res\FP-TC-120 @1\Channel 0
In most cases, the preceding steps are all that is required to configure an
OPC client to read from I/O Items of the FieldPoint OPC server. In some
cases, the OPC client might require more information about the FieldPoint
OPC server. The following list contains additional information about the
FieldPoint OPC server, which you might find helpful.
• The FieldPoint OPC server does not require an access path. Some OPC
clients might expect the access path to be included in the Item ID name
or might request the access path when you select I/O Items. You should
be able to leave the access path blank (empty string).
• The FieldPoint OPC custom interface is an out of process server.
• The FieldPoint OPC server supports both synchronous and
asynchronous reads and writes.
• The FieldPoint OPC server uses the "GetErrorString" method to return
error and diagnostic messages from the FieldPoint server and
hardware. OPC clients that do not support this method might give you
error messages like "Bad, non-specific" along with an error code.
Some OPC clients that do not support this "GetErrorString" method
might still provide a way for you to manually look up the FieldPoint
message corresponding to the error code using the method.
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