ProSoft Technology AN-X2-SQD - Manual (Page 25)

AN-X2-SQD-MAS Page 19
Exchanging Scheduled Data with a ControlLogix
The AN-X2-SQD-MAS supports multiple scheduled connections with a ControlLogix
processor over Ethernet.
The AN-X2-SQD-MAS behaves like a 17-slot ControlLogix rack with an ENBT/A
module in slot 16 and generic modules in slots 0 to 15. I/O data can be mapped to slots 0
to 14. Slot 15 is reserved for diagnostics.
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 words of input data from the AN-X to
the ControlLogix processor.
Each connection can have a different RPI.
In general, keep the number of connections small. There is significant overhead in
opening and maintaining each connection.
You map the inputs and outputs for the Remote I/O 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 input and output data to the ControlLogix scheduled data by creating a comma
separated variable file that defines the mappings and sending 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 drop and slot where the data is to be found.
When you create a mapping, all the input or output data for the drop and slot is mapped;
you cannot map individual registers.
AN-X automatically creates a mapping file when you autoconfigure I/O. See page 15
for details.
Anything after a semicolon on a line is treated as a comment.
ClxName
The first line in the file identifies the AN-X module. AN-X uses this name in the address
portion of the ControlLogix aliases for the Remote data.