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AN-X2-MOD-MAS
May 2016
The address is AnxMod:0:O.Data[0]. The address is made up of the ClxName and the
data location. The default ClxName assigned by autoconfiguration is the hostname.
Using the ControlLogix Log
If there are problems with scheduled connections to the AN-X, use the ControlLogix log
to identify the cause.
From the web interface, select
Log Files/ControlLogix Log
to display the log. Look for
error messages that describe in detail the cause of any problem with the current
configuration.
Redundancy
The AN-X2-MOD-MAS includes features to make it easy to enable and disable AN-X
I/O scanners. It can be used to implement redundant I/O scanners, redundant controllers,
etc.
One ControlLogix and AN-X is designated the primary and acts as the scanner; the other
is designated the secondary and acts as a backup.
If the primary ControlLogix decides there is a problem, it takes its AN-X offline and the
backup takes over.
The backup AN-X constantly monitors the S908 network. When it becomes the primary,
it has the current state of inputs, drop status, etc. Each ControlLogix processor has access
to current I/O data from the S908 network.
The backup AN-X listens to the S908 network when it is told to go online as a scanner. It
waits for 10 ms of silence on the network before it takes over. It does not start scanning
if it hears another master already online.
There have been changes and additions to the ControlLogix configuration file to support
redundancy. No changes are required to the S908 I/O Configuration file.
The firmware is backwards compatible. Existing applications do not need to be modified.
The AN-X distribution CD and website have technical notes that describe in detail the
procedure for using redundant AN-X modules.
ControlLogix Ethernet Configuration File
The ControlLogix configuration file has the following elements to support redundancy.
Parameter
Description
RedundEna, RedundPrefix
Must be included at the beginning of the ControlLogix
configuration file
RedundPrefix is used to create aliases for data
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