AN-X-GENI Page
23
January 2008
Exchanging Scheduled Data with a ControlLogix
The AN-X-GENI supports multiple scheduled connections with a
ControlLogix processor over Ethernet.
The AN-X-GENI behaves like a 17-slot ControlLogix rack with an
ENBT/A module in slot 16 and generic modules in slots 0 to 15.
A ControlLogix processor can open a scheduled connection to each of
these 16 generic modules. Each scheduled connection consists of up to
248 words of output data from the ControlLogix processor to the AN-X
and up to 250 word of input data from the AN-X to the ControlLogix
processor.
Each connection can have a different RPI, from 5 to 750 ms.
In general, keep the number of connections small. There is significant
overhead in opening and maintaining each connection.
You then map the inputs and outputs for the Genius blocks to these
scheduled connections. AN-X can create the mappings automatically or
you can create a mapping configuration manually.
You can let AN-X create a mapping file automatically, then edit the file
to better suit your application. For example, in order to make the most
efficient use of the available Ethernet bandwidth, you can organize the
data so that items that must update quickly are mapped to connections
with short RPIs and items that are less time critical are mapped to
connections with longer RPIs.
In addition, the AN-X module has diagnostic data that can be mapped to
ControlLogix scheduled input data.
Mapping I/O Data
You map Genius input and output data to the ControlLogix scheduled
data by creating a comma separated variable file that defines the
mappings, then send the file to the AN-X.
The file contains sections for each scheduled connection. Within each
scheduled connection are the definitions for the input and output data for
that connection. These definitions refer to the Genius module where the
data is to be found.
When you create a mapping for a Genius module, all the input or output
data for the module is mapped; you cannot map individual registers.
The file also contains options that apply to the whole configuration.
AN-X can automatically create a default mapping file when you
autoconfigure I/O. See page 18 for details.
Anything after a semicolon on a line is treated as a comment.
