Allen-Bradley 1756-M02AS User Manual page 16

Chapter 1 Create and Configure a Coordinate System
Table 1 - Tag Parameter Descriptions
Parameter Connection
Name
Description
Type
Alias For
Data Type
Scope
External Access
Style
Constant
16
Description
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 (_).
Type a description of the tag. This field is optional and is used for annotating the tag.
Use the pull-down menu to select what type of tag to create. For a coordinate system, the only valid choices are Base and
Alias. If you select either Produced or Consumed, it 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 identify to which base tag the alias refers.
If you selected Alias as the tag Type, enter the name of the associated Base Tag.
The Data Type field defines the size and layout of memory that is allocated when the tag is created. Select
COORDINATE_SYSTEM.
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.
Choose whether the tag has Read/Write, Read Only, or no (None) access from external applications such as HMIs.
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.
To prevent executing logic from writing values to the tag, check the Constant checkbox. The state of the Constant checkbox
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 date type of the tag is not a Data Table backed type.
• The usage of the tag 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
checkbox was previously selected, the Constant checkbox 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.
Rockwell Automation Publication MOTION-UM002E-EN-P - June 2016