You can ensure a process database contains no configuration errors by
verifying it. Verifying a database also ensures that iFIX can process
each block and that the database functions as you intend.
While verifying a process database, Database Manager ensures that each
block:
- Is in only one chain.
- Is linked to an appropriate
block (for example, a Statistical Control block can be preceded only by
a Statistical Data block).
- Is used in the correct
context (for example, as a stand-alone, a primary, or a secondary block).
- Does not reference
non-existent blocks.
If Database Manager detects no errors, it displays a message box to
inform you. However, if it encounters errors, the Verify Database dialog
box appears. This dialog box lists each error and the block that contains
it. The following table lists the possible verification errors and how
to resolve them.
Resolving
Verification Messages
|
When you see the message...
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It means...
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To correct this configuration...
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tagname
a:tagname
b Tag is in more than one chain
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The block, tagname
b, has more than one upstream block linked to it. Tagname
a identifies one of these blocks.
|
Remove one or more links to tagname
b.
|
|
tagname:Tag
is not in any chain
|
You may have a secondary block that is not in any
chain or is the first block in a chain.
|
Remove the secondary block or add a primary block
to the start of the chain.
|
|
tagname:
Block not found for NEXT
|
The block, tagname,
chains to a block that does not exist.
|
Create a block with the name specified in the Next
field or enter the name of a block that exists.
|
|
tagname:Chains
to itself
|
The block, tagname,
contains its own name in its Next field.
|
Change the name in the Next field or leave it blank.
If you want to repeatedly perform a task, use a Program block instead.
|
|
tagname:
is not defined
|
The block, tagname,
does not exist and another block references it.
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Create the block or change the reference to a block
that exists.
|
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fieldname
No such field in FDT
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The field, fieldname,
does not exist and it is referenced by a block in the database.
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Change the reference to a field that exists.
|
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Exceeding MAX chain size of 30
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The database contains a chain with more than 30 blocks.
|
Redesign this chain by breaking it into two smaller
chains or remove any unnecessary blocks.
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Correcting Errors
You can correct any error by double-clicking it to display the associated
block configuration dialog box.
To correct errors:
- Edit the block to
correct the problem.
- Save the block.
- Re-verify the database.
See Also
How Do I...
