Set I/O access parameters

You can set the I/O attributes of tags in the Tagname Dictionary. These attributes identify the external data source associated with the tag.

These steps only explain how to specify I/O attributes from the Tagname Dictionary. For more information about configuring Galaxies and Access Names, see Data access with I/O.

Set tag I/O attributes

1. Assign an I/O tag type to the tag from the Tag Types dialog box. The detail portion of the Tagname Dictionary dialog box appears.

   

2. Select Access Name to define or select the Access Name assigned to the tag. The Access Names dialog box appears showing a list of current Access Names recognized by the InTouch HMI. (Galaxy is the default Access Name for an ArchestrA connection.)

   

3. Add an Access Name or accept the default.

4. Select the data point in the server program that the I/O tag will read and write data.

   • To read and write data to and from a process data point in the server program, type the Item Name in the Item box. For example, to read a value from a register in a PLC, type the identity of the register as the Item Name. For example:

     To use the register 1 of an Allen-Bradley PLC as the Item Name, type R1 in the Item box.

     To use the least significant bit of register 1 of an Allen-Bradley PLC as the Item Name, type R1:0 in the Item box.

   • To use the tag as the item, select Use Tagname as Item Name. Item Name supports a maximum of 254 characters.