Alarm Status Alignment - Allen-Bradley 1444-TSCX02-02RB User Manual

Chapter 8 Configure Alarms
Element (continued) Quantity
Relay 1, 5, 9, 13
Alarm Status 13
212
Associations
• A relay can be associated with a
specific output of a voted alarm,
and/or one or more Fault conditions
• Dynamic Alignment
– One per Relay that is not enabled
– One per Relay that is configured
to actuate on Fault (only)
– One per enabled Voted Alarm
Output
• Static Alignment
– One per enabled Voted Alarm

Alarm Status Alignment

There are 13 instances of Alarm Status. Alarm Status Alignment (Module
Definition, General page) configuration determines how they are allocated
and associated with relays and voted alarms.
Dynamic Alignment
Dynamic alignment makes sure that an Alarm Status is assigned to each relay.
Because Relay Status provides only an indication that a relay is energized,
further detail such as Alarming, Actuated, Bypass must be read from an
associated Alarm Status.
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Comments
• When a relay is associated with an output of a voted alarm, the associated voted
alarm implements the relay logic.
• When a relay is configured to actuate on one or more Fault conditions, then the fault
detection logic is independent of any associated voted alarm.
• Relay status is provided in the relay status structure of the controller input assembly.
See Relay Status Structure on page 286.
• When Alarm Alignment is configured as Dynamic (default), the module makes sure
that an Alarm Status is assigned to, or left reserved for, each Relay in the system. See
Alarm Status Alignment on page 212.
• Alarm Statuses are assigned as follows:
For each Relay:
– If not enabled then reserve an Alarm Status for it
– If enabled but only for Fault (so does not reference a voted alarm output), then
assign an Alarm Status and set its voted alarm instance to 14
– Assign an alarm status to the voted alarm output referenced by the relay
• Assign any remaining Alarm Statuses to any remaining enabled voted alarm
outputs.
• When Alarm Alignment (see Alarm Status Alignment on page
Static, the module assigns an Alarm Status to each voted alarm output.
• When Alarm Alignment is Static, a Voted Alarm can specify only one output: Alert,
Danger, or Transducer Fault.
• Alarm Statuses are assigned to each Voted Alarm.
– Alarm Status 0 --> Voted Alarm 0
– Alarm Status 1 --> Voted Alarm 1
...
– Alarm Status 12 --> Voted Alarm 12
• A Relay has an associated Alarm Status only if the relay references a voted alarm.
212) is configured as