ProSoft Technology AN-X-MOD - Manual (Page 48)

Page 44 AN-X-MOD (Master) November 2011
Offset Description
2 Init counter, increments whenever a drop on the S908
network is reinitialized
3 current S908 network update time
4 maximum S908 network update time
Map ScanSts to input data for any connection.
By default, when you perform an autoconfiguration and create a
ControlLogix configuration, AN-X maps the ScanSts array to the
connection to slot 15, but comments out the mapping.
LongInput
800 series drops send inputs only when the inputs change. In redundant
applications with 800 series drops, include the LongInput parameter in
the ControlLogix configuration file to ensure that the backup has the
latest inputs.
Aliases
The AN-X-MOD (Master) creates aliases that can be imported into
RSLogix 5000.
Item Alias name prefix Base tag
Unique elements,
such as diagnostics RedundPrefix ClxName
I/O inputs ClxPrefix DataInput name, if
present
I/O outputs ClxPrefix DataOutput name, if
present
Switchover
When you turn on the RedundCtl bit for an AN-X-MOD (Master)
module, it waits for 10 ms of silence on the network before it starts
scanning as master.
WARNING!!! If the RedundCtl bits on both AN-X modules are on, only
one acts as master. However, if the bits are set on both AN-X modules
and the current master is disconnected from the S908 network, even for a
very short period, the backup takes over. If the module that was
disconnected comes back online, both modules will be master on the
S908 network. YOUR APPLICATION MUST CHECK FOR THE
DUPLICATE MASTER CONDITION AND TAKE APPROPRIATE
ACTION!