Справочник Пользователя для Siemens C79000-G8976-C156-07

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Commissioning PC Stations - Manual and Quick Start
Release 5/2005

C79000-G8976-C156-07

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Variable cannot be added

Adding some or all variables is denied in the Navigator of the OPC Scout.
Possible causes for this are as follows:

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The variable name entered does not have the correct syntax.

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When using symbolic variables: The symbol file does not match the project
engineering configuration.

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The access permissions for the variables are restricted: Neither read nor
write permissions.

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A protocol or connections are not visible

No protocols are visible in the left-hand window of the navigator or protocols or
connections are missing. Possible causes for this are as follows:

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Some of the required connections were not created during configuration in
the project engineering.

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A module configured in the project engineering does not exist or was not
correctly initialized.

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The configuration data created in the project engineering configuration have
not yet been transferred or transfer was unsuccessful.

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Quality of the variables is “bad”.

In the table view of the process variables, the value “bad” is entered for some or
all variables in the “Quality” column. Possible reasons for this are as follows:

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The network connection to the partner device is down.

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The partner device is not configured in the project engineering.

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The bus parameters of the PC station and partner device do not match.

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The value of the information variable for the connections status is “Down”.

The information variable has the quality “good”, however, the value is not “Up”.

These variables are generated by the OPC Server and always have the quality
“good”. The possible reasons for the value on the variable identical to those for
quality = “bad”.