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AN-X2-MOD-MAS
May 2016
LongInput
Most 800 series drops send inputs only when the inputs change. You can force 800 series
drops to send inputs on every scan by including the LongInput parameter in the
ControlLogix configuration file. That way, when you switch between AN-X modules,
you can be sure that the backup has the latest inputs.
Aliases
The AN-X-MOD-MAS 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
Criteria for Switching between AN-X Modules
The ControlLogix processor maintains connections to both AN-X modules. It can
monitor data on both AN-X modules and can switch between them based on:
•
diagnostic counters
•
drop error table
•
module health bits
Switchover
To switch between AN-X modules:
1.
Set RedundCtl on the backup AN-X to 1. The backup AN-X will not go
online while it ses the primary AN-X as master on the network.
2.
Set RedundCtl on the primary AN-X to 0. The backup AN-X will now
become master on the S908 network.
When you turn on the RedundCtl bit for an AN-X-MOD-MAS 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 will act 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 will take over. When the module that was
Summary of Contents for AN-X2-MOD-MAS
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