Rockwell Automation Publication 1769-UM022C-EN-P - June 2018 145
Develop Safety Applications Chapter 9
Figure 36 - Creating a New Tag
Tag Type
Table 23 defines the four types of tags.
Table 23 - Four Tag Types
Tag Type Description
Base tag These tags store values for use by logic within the project.
Alias tag A tag that references another tag. An alias tag can refer to another alias tag or a base tag. An
alias tag can also refer to a component of another tag by referencing a member of a structure,
an array element, or a bit within a tag or member.
IMPORTANT: Do not use alias tags between standard and safety tags in safety applications.
Instead, standard tags can be mapped to safety tags using safety tag mapping. See
Safety Tag Mapping
on page 156.
Produced tag A tag that a controller makes available for use by other controllers. A maximum of 15
controllers can simultaneously consume (receive) the data. A produced tag sends its data to
one or more consuming tags without using logic. Produced tag data is sent at the RPI of the
consuming tag.
Consumed tag A tag that receives the data of a produced tag. The data type of the consumed tag must match
the data type of the produced tag. The requested packet interval (RPI) of the consumed tag
determines the period when the data updates.
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