Instruction-based alarms

Analog alarms. An analog alarm defines a condition that evaluates a single analog tag against up to four limit values (high-high, hi, low, and low-low) and up to two rate of change limits (positive and negative). Use the ALMA instruction to implement this type of alarm.

Digital alarms. A digital alarm monitors a tag for alarm conditions based on whether the tag is equal or not equal to zero. Each value represent a specific alarm condition. Use the ALMD instruction to implement this type of alarm.