Produce and Consume (Interlock) Data
The controllers let you produce (transmit) and consume (receive) controller-scoped tags.
Logix 5000®
controllers produce the same standard tag through both the Ethernet port and the backplane, and consumer counts apply to the total consumers from both ports.Illustration of Produced and Consumed Tags
The following table describes the system-shared tags.
Tag | Definition |
|---|---|
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. |
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 the connections of the controller and communication modules.
Safety controllers can also use produced and consumed safety tags.
For a
ControlNet®
network, produced and consumed tags use scheduled connections.Requested Packet Interval (RPI) of Multicast Tags
The first consumer of a multicast produced tag on any communication port establishes the RPI value for that port. All subsequent consumers using 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.
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