In order for iFIX to determine if an analog process value is in alarm, you must enter pre-defined values, called alarm limits, that you do not want the block to exceed. Should a block exceed one of these limits, iFIX generates an alarm, as the following figure shows.
Digital Alarm Limits
For digital blocks, you can specify alarm conditions, not alarm limits. An alarm condition indicates when you want a digital block to generate an alarm. For example, if you set up a block to monitor a motor that is ON, you can configure the block to generate an alarm when the motor changes to a different state or when it switches OFF.
