Allocating device placeholders to I/O interfaces

An allocated device is a device placeholder that has been defined and associated with an I/O connection path (card or CHARM) or with a WIOC.

You can see all unallocated device placeholders in the DeltaV system under Unallocated Devices in DeltaV Explorer. You can also see them in I/O Studio by filtering for the Unallocated allocation state.

In order to allocate a device placeholder to a CHARM connection path, the Device Definition of the placeholder must be compatible with the CHARM hardware type. The following table shows which Device Definitions are compatible with specific CHARM hardware types.

When you allocate an I/O device placeholder, the device is represented by a DeltaV DST under the card, CHARM, or WIOC to which it is allocated.

You can manually allocate an unallocated device placeholder in I/O Studio in any of the following ways:

• On the IO Assignment card of the unallocated device placeholder tab, click the vertical ellipsis and browse for the connection path.
• On the IO Assignment card of the unallocated device placeholder tab, type a valid connection path in the Connection Path field.
• Navigate to the node tab for the CIOC or CSLS and browse to the unallocated device placeholder.
• Navigate to the node tab for the CIOC or CSLS and type the name of the unallocated device placeholder in the Device Name field.
• Navigate to the node tab for the WIOC and add a wireless device placeholder.

You can manually allocate an unallocated device placeholder in DeltaV Explorer by doing either of the following:

• Right-click a CHARM, select Properties, and either type or browse to the name of the device placeholder in the Device Tag field of the CHARM Property Dialog.
• Drag and drop an unallocated device placeholder from the Unallocated Devices container to an I/O node or I/O channel.

Alternatively, you can use the DeltaV Device Commissioner application to automatically allocate an unallocated device placeholder.

When a device placeholder is unallocated, its Device Type is Unallocated Device. When a device placeholder is allocated to an I/O node or I/O channel, the Device Type changes to the appropriate DST type for the node or channel, as shown in the following table.

You can change the I/O interface to a different type, but if you choose a type that is incompatible with the device definition, you will be unable to save the configuration.