198 Rockwell Automation Publication 5069-UM002A-EN-P - January 2019
Chapter 8 Develop Control Applications
Table 15 describes the system-shared tags.
For two controllers to share produced or consumed tags, the controllers must
be attached to the same network. You cannot bridge produced and consumed
tags over two networks.
Produced and consumed tags use connections of the controller and the
communication modules being used.
Requested Packet Interval (RPI) of Multicast Tags
The first consumer of a multicast produced tag on any given communications
port establishes the RPI value for that port. All subsequent consumers that use
the same port must request the same RPI value as the first consumer, otherwise
they fail to connect. Controllers with backplane and Ethernet ports can
produce data at an independent RPI value on each port.
For more information about produced/consumed tags, see the Logix 5000
Controllers Produced and Consumed Tags Programming Manual,
publication
1756-PM011.
Table 15 - Produced and Consumed Tag Descriptions
Tag Description
Produced tag A tag that a controller makes available for use by other controllers. Multiple controllers can
simultaneously consume (receive) the data.
A produced tag sends its data to one or more consumed tags (consumers) without using logic.
Consumed tag A tag that receives the data of a produced tag. The data type of the consumed tag must match
the data type (including any array dimensions) of the produced tag. The RPI of the consumed
tag determines the period at which the data updates.
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