Produce and Consume a Tag
Chapter 1
Rockwell Automation Publication 1756-PM011J-EN-P - February 2018
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L36ERM, in the consuming controller’s I/O configuration. These
controllers have a built-in Ethernet port and therefore can be addressed
using an EtherNet/IP Address.
•
To consume tags through the backplane port on a GuardLogix 5580 or
ControlLogix 5580 controller, represent the controller as a
ControlLogix 5570, such as the 1756-L75, in the consuming
controller’s I/O configuration. This process allows connection using
the backplane.
When you migrate projects from an earlier controller model to Compact
GuardLogix 5380, CompactLogix 5380, CompactLogix 5480, ControlLogix
5580, or GuardLogix 5580 controller, you need to verify that projects
containing multicast produce tags are configured correctly.
Compact GuardLogix 5380 and GuardLogix 5580 controllers in v31
only produce safety tags as unicast
Compact GuardLogix 5380 and GuardLogix 5580 controllers only produce
safety tags as unicast. They can consume safety tags as either unicast or
multicast. When configuring a consumed safety tag, consider the capabilities
of the producer.
•
If the producer in the I/O configuration of this controller is a Compact
GuardLogix 5380 or GuardLogix 5580 controller, and you are
consuming a safety tag, configure the consumed tag to use unicast.
•
If the producer in the I/O configuration of this controller is a Compact
GuardLogix 5370 or GuardLogix 5570 or 5560 controller, the safety
consumed tag can be configured as wither unicast or multicast.
RPI limitations
In releases before v28, produced tags produce data at the requested packet
interval (RPI) of the fastest requesting consumer. This behavior allows
multiple consumers, with different RPI settings, to successfully connect to a
producer. In releases v28 and later, the first consumer of a produced tag
determines the RPI at which data is produced. All subsequent consumers
must request the same RPI value as the first consumer or they fail to connect
and display error code 0112.
The first consumer of a produced tag is the device that sends the first
consumer connection to the producing controller. The first consumer request
is based on the order in which the producer and consumer control system
powers up, so the first consumer can change if power is cycled to the system.
You cannot configure a device to be the first consumer. It can be difficult to
tell which consumer will send the first request to the producing controller, so
you should plan accordingly when configuring multicast produced tags.
Considerations
when migrating
projects that
contain multicast
produce tags
