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Chapter 8
Configure Alarms
226
If an Input that is included in the specific Logic references a Measurement
Alarm that is not enabled, then an error symbol is presented next to the Input,
along with a notice following the Measurement Alarms selections. See
Figure
90.
Figure 90 - Measurement Alarms
Inputs
There are two elements to the inputs of a voted alarm including the
measurement alarm status and a list of measurement alarms. The status
definition provides the specific conditions that this voted alarm acts on; alert
and/or danger and/or transducer fault. The other input is a list of up to four
enabled measurement alarms to use as input to the voting logic. (For example, 1
out of 2, 3 out of 4).
Logic
Logic is the "A out of B" voting that is applied to the inputs. Selections are
provided which support various combinations of four inputs and include:
Logic
1 Out Of 1
1 Out Of 2
2 Out Of 2
1 Out Of 3
2 Out Of 3
3 Out Of 3
For the AND and/or combinations, the inputs are grouped in the order they
are entered. That is, inputs 0 and 1 for the BEFORE the and/or statement logic
and inputs 2 and 3 for the AFTER the and/or statement logic.
For a vote to resolve to TRUE (1), the logic must be satisfied with inputs that
are all in the same condition, and as defined for the voted alarm (alert/danger/
fault).
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
1 Out Of 4
2 Out Of 4
3 Out Of 4
4 Out Of 4
1 Out Of 2 AND 1 Out Of 2
2 Out Of 2 OR 2 Out Of 2
1 Out Of 2 AND 2 Out Of 2
2 Out Of 2 AND 1 Out Of 2
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