Configure I/O as read/write

Select Read/Write in the I/O parameters area. Define an input source by using I/O auto-assignment, by typing in the reference string, or by selecting the Attribute Browser button at the right.

• Use I/O auto-assignment to prepare the input source for automatic assignment to a configured Device Integration object or other data source. For information about using I/O auto-assignment, see I/O auto assignment.

  If InputSource or OutputDest attributes, or both, are locked in the parent template, the attributes cannot be updated with the resolved reference when the object is deployed, and the runtime value will be "---Auto---".

• Use the Attribute Browser to select an attribute and automatically insert the correct reference string for that attribute. For more information about using the Attribute Browser, see Use the galaxy browser to reference objects .

• If you are configuring an I/O attribute for use with the Telemetry Server, see ATS-configure I/O for use with AVEVA Telemetry Server Communication Drivers for additional information.

If the output destination and the input source are not the same, select Output destination differs from input source. Enter a Destination attribute by using I/O auto-assignment, by typing in the reference string, or by using the Attribute Browser to search for the reference string in an object.

Important: If you clear the Output destination differs from input source check box, the Write to text box automatically shows "---". In the runtime environment, "---" is the same reference as the Read from value entered during configuration time. During runtime, you can change the Read from reference. During configuration, do not lock the Write to parameter if you clear the Output destination differs from input source check box.

A Read/Write I/O Feature allows an attribute in a template or an instance to be configured so that its value is both read from and written to an external reference. The Read/Write I/O Feature monitors the value/quality of an input and sends outputs on state change.

The Write to (output) destination can be the same or different from the Read from (source). The references are always to another acceptable attribute type in the Galaxy.

You can add multiple Read/Write I/O Features to an object. However, you cannot add a Read/Write I/O Feature to an attribute that already has a Read or Write I/O Feature.

Note: You can add a Read/Write I/O Feature to lockable attributes, but they only function correctly during runtime if the configured attribute is unlocked.