Discrete and persistent alarms

mapp Services V5.16

A discrete alarm (edge alarm) is an individual event that only occurs for a short time. An example would be a message that a file could not be opened.

Discrete alarms are configured as follows in the Visual Components 4 HMI application.

The following applies to all discrete alarms:

•Acknowledge: Required

•WhileActive: Enabled

Example: The file could not be opened.

discretealarm_vc4settings

A persistent alarm represents a system state. An example would be the level in a tank being too low. This alarm remains in place until the tank is full again.

Persistent alarms are configured as follows in the Visual Components 4 HMI application.

The following settings apply to persistent alarms that require acknowledgment:

•Acknowledge: Required

•WhileActive: Enabled

Example: The temperature is critical, the heating process was interrupted.

persistentalarm_ackrequired_vc4settings

The following settings apply to persistent alarms that require acknowledgment (but acknowledgment is only possible after the alarm is inactive):

•Acknowledge: Required

•WhileActive: Disabled

Example: Safety door was opened, motors were stopped.

persistentalarm_ackrequired_afterreset_vc4settings

The following settings apply to persistent alarms that do not require acknowledgment:

•Acknowledge: Possible

•WhileActive: Enabled

Example: The water level in the tank is low.

persistentalarm_acknotrequired_vc4settings