You can use the Digital Alarm block to:
- Detect alarm conditions of a digital state (either level or transition).
- Represent items such as limit switches, valves, alarm contacts, or motor auxiliary contacts.
- Assign descriptive labels to digital values through the Open (Labels) and Close (Labels) fields to make them more meaningful to the operator.
- Define the alarm value and priority for the block.
- Close a digital block when an alarm condition occurs.
- Re-issue an alarm within the time defined in the Re-alarm Time field, as long as the block is still in a valid alarm state OR the Re-alarm Time is not disabled.
- Suspend alarm processing within this block or multiple blocks based on a process condition.
- Acknowledge alarms from a remote site.
- Enable a block to attempt to write the contacts with every scan, even if the value being written is unchanged.
- Separate the original alarm condition from the COMM alarm, and return the DA block to the same state as it was prior to a COMM alarm.
- Assist in control situations such as direct digital control when chained to a PID or On-Off Control block.
- Pass values to other blocks through the Next Block field.
