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FactoryTalk Alarms and Events Logix-based Instructions (ALMD, ALMA) Chapter 1
Controller Memory Use
As a guideline use the following alarm sizes for a rough calculation of controller memory usage:
•
Typically 1 KB per digital alarm with no associated tags
Digital Alarm Example
Digital alarm with no associated tags and this configuration:
•
Alarm message: Contactor Fault
•
Alarm Class: Tank Farm A
Digital alarm with two associated tags and this configuration:
•
Alarm message: Contactor Fault
•
Alarm Class: Tank Farm A
•
Associated Tag 1 = DINT data type
•
Associated Tag 2 = DINT data type
Digital alarm with two associated tags and this configuration:
•
Alarm message: Contactor Fault
•
Alarm Class: Tank Farm A
•
Associated Tag 1 = DINT data type
•
Associated Tag 2 = STRING data type
Approximate Size
1012 bytes
1100 bytes
1522 bytes
Publication 1756-RM003K-EN-P - July 2008 Year
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
73
Chapter 1 FactoryTalk Alarms and Events Logix-based Instructions (ALMD, ALMA)
•
Typically 2.2 KB per analog alarm with no associated tags
Analog Alarm Example
Analog alarm with no associated tags and this configuration:
•
HH Alarm message: Level Alarm
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H Alarm Message: Level Alarm
•
L Alarm Message: Level Alarm
•
LL Alarm Message: Level Alarm
•
Rate of Change Positive Message: Fill Too Fast
•
Rate of Change Negative Message: Empty Too Fast
•
Alarm Class: Tank Farm A
Analog alarm with two associated tags and this configuration:
•
HH Alarm message: Level Alarm
•
H Alarm Message: Level Alarm
•
L Alarm Message: Level Alarm
•
LL Alarm Message: Level Alarm
•
Rate of Change Positive Message: Fill Too Fast
•
Rate of Change Negative Message: Empty Too Fast
•
Alarm Class: Tank Farm A
•
Associated Tag 1 = DINT data type
•
Associated Tag 2 = DINT data type
Analog alarm with two associated tags and this configuration:
•
HH Alarm message: Level Alarm
•
H Alarm Message: Level Alarm
•
L Alarm Message: Level Alarm
•
LL Alarm Message: Level Alarm
•
Rate of Change Positive Message: Fill Too Fast
•
Rate of Change Negative Message: Empty Too Fast
•
Alarm Class: Tank Farm A
•
Associated Tag 1 = DINT data type
•
Associated Tag 2 = STRING data type
Approximate Size
2228 bytes
2604 bytes
4536 bytes
Longer message strings, as well as message strings for multiple languages, consume additional memory from your controller.
Actual memory usage will depend on how the alarm is configured, message length, and any associated tags passed with the alarm.
74
Publication 1756-RM003K-EN-P - July 2008
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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