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Chapter 1
Create and Configure a Coordinate System
Use the parameter descriptions below to help you configure your new tag.
Table 1 - Tag Parameter Descriptions
Parameter Connection
Description
Name
Type a relevant name for the new tag. The name can be up to 40 characters and can be composed of letters, numbers, or
underscores (_).
Description
Type a description of the tag. This is an optional field and is used for annotating the tag.
Type
Use the drop-down menu to select what type of tag to create. For a coordinate system, the only valid choices are Base and
Alias. Selecting either Produced or Consumed generates an error when the OK button is pressed.
• Base refers to a normal tag (selected by default).
• Alias refers to a tag that references another tag with the same definition. Special parameters appear on the New Tag
dialog box that lets you to identify to which base tag the alias refers.
Alias For
If you selected Alias as the tag Type, enter the name of the associated Base Tag.
Data Type
The Data Type field defines the size and layout of memory that is allocated when the tag is created. Select
COORDINATE_SYSTEM.
Scope
Choose the Scope for the tag. The scope defines the range at which tags and routines can be created. A Coordinate System
Tag can only be configured at the Controller Scope.
External Access
Choose whether the tag has Read/Write, Read Only, or no (None) access from external applications such as HMIs.
Style
The Style parameter is not activated. No entry for this field is possible.
After the information for the tag is entered, you have these options.
• Click OK to create the tag and automatically place it in the Ungrouped Axes folder or the Motion Group if the tag was
initiated from the Motion Group menu.
• Click Open COORDINATE_SYSTEM Configuration to invoke the Coordinate System Tag Wizard after you click Create. The
wizard helps you to configure the Coordinate System tag.
Constant
To prevent executing logic from writing values to the tag, check the Constant check box. The state of the Constant check box
depends on the type of tag selected. It appears dimmed under the follow conditions.
• The tag is an alias tag or a consumed tag.
• The FactoryTalk Security action for changing the Constant Value property of a tag is unavailable and the tag is not in the
Add-On Instruction definition scope.
• You do not have permissions to modify tag properties (the FactoryTalk Security Tag Modified is denied) and that tag is
not in the Add-On Instruction definition scope.
• The tag's date type is not a Data Table backed type.
• The tag's usage is not InOut.
• The redundancy controller is in any state that does not allow changes.
• The controller has been locked online from another computer.
• The controller is safety secured and the tag is a safety tag or a safety mapped tag.
• The scope is an equipment phase but the Equipment Phase feature is not activated in the current Logix Designer
application license.
• The controller is in hard Run mode.
• The Add-On Instruction is in Source Protection mode.
• You are not allowed to modify Add-On Instructions (FactoryTalk Security Add-On Instruction Modify is Denied) and the
tag is in Add-On Instruction definition scope.
For details about FactoryTalk Security see FactoryTalk Help: 
Start > Programs > Rockwell Software > FactoryTalk Tools > FactoryTalk Help.
Note: If the properties of the tag modification (for example, Constant Tag property), no longer apply and the Constant check
box was previously selected, the Constant check box is not checked.
Click Open COORDINATE_SYSTEM Configuration to display the wizard
that guides you through the process of configuring a coordinate system. You can
also right-click the tag and choose Properties to access the configuration wizard.
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Rockwell Automation Publication MOTION-UM002D-EN-P - February 2015