Produce and Consume a Tag
Chapter 1
Rockwell Automation Publication 1756-PM011J-EN-P - February 2018
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Example:
Reconstruct a floating point value.
The two MOV instructions reverse the order of the integers as the
integers move to a new location. Because the destination of the COP
instruction is a floating-point address, it takes two consecutive
integers, for a total of 32 bits, and converts them to a single floating-
point value.
RPI limitations and negotiated behavior vary depending on the version of the
Logix Designer application that is running on your controllers.
Behavior in releases v28 and later
In releases v28 and later, the first consumer of a produce 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 produce 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. There is no way to
tell which consumer will send the first request to the producing controller, so
you must plan accordingly when configuring multicast produce tags. See
Considerations when migrating projects that contain multicast produce tags
for more information.
RPI limitations and
negotiated default