> For the complete documentation index, see [llms.txt](https://docs.videc.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.videc.de/acron-9.3/en/anlagenkonfiguration/prozessanbindung/provider/providerid/variablengruppe/register_alarmgenerierung/grenzwertalarm.md).

# Limit value alert

A limit value alert is triggered when a threshold value has not been reached or has been exceeded.

There are four levels of limit value alerts: the shortfall indicators LOLO, LO and the exceedance indicators HI and HIHI.

The corresponding threshold values must be plausible: LOLO < LO < HI < HIHI.

Valid priorities are in the range from 0 to 999; 1 is the highest priority.

## LOLO alert

Alert triggered when its [start value](/acron-9.3/en/anlagenkonfiguration/prozessanbindung/provider/providerid/variablengruppe/register_alarmgenerierung/einstellungen.md#anfangswert) is not reached.

### Threshold value <a href="#schwellenwerthi" id="schwellenwerthi"></a>

If a value falls below this value a LOLO alert is triggered.

Note

LOLO < start value; The threshold values must be plausible: LOLO < LO < start value < HI < HIHI.

### Priority

The valid priority is in the range from 0 to 999; 1 is the highest priority.

## LO alert

Alert triggered when its [start value](/acron-9.3/en/anlagenkonfiguration/prozessanbindung/provider/providerid/variablengruppe/register_alarmgenerierung/einstellungen.md#anfangswert) is not reached.

### Threshold value <a href="#schwellenwerthi" id="schwellenwerthi"></a>

If a value falls below this value a LO alert is triggered.

Note

LO < start value; The threshold values must be plausible: LOLO < LO < start value < HI < HIHI.

### Priority

The valid priority is in the range from 0 to 999; 1 is the highest priority.

## HI alert

Alert triggered when its [start value](/acron-9.3/en/anlagenkonfiguration/prozessanbindung/provider/providerid/variablengruppe/register_alarmgenerierung/einstellungen.md#anfangswert) is exceeded.

### Threshold value <a href="#schwellenwerthi" id="schwellenwerthi"></a>

If this value is exceeded a Hi alert is triggered.

Note

Start value < HI; The threshold values must be plausible: LOLO < LO < start value < HI < HIHI.

### Priority

The valid priority is in the range from 0 to 999; 1 is the highest priority.

## HIHI alert

Alert triggered when its [start value](/acron-9.3/en/anlagenkonfiguration/prozessanbindung/provider/providerid/variablengruppe/register_alarmgenerierung/einstellungen.md#anfangswert) is exceeded.

### Threshold value <a href="#schwellenwerthi" id="schwellenwerthi"></a>

If this value is exceeded a Hi alert is triggered.

Note

Start value < HIHI; The threshold values must be plausible: LOLO < LO < start value < HI < HIHI.

### Priority

The valid priority is in the range from 0 to 999; 1 is the highest priority.

## Limit value alert dead zone <a href="#totzone" id="totzone"></a>

A limit value alert is only cleared when the current value exceeds the threshold value plus (LOLO, LO) or less (HI, HIHI) the alert dead zone.

Note

The alert dead zone should be selected so that it does not extend into other limit ranges.

### Configuring a range limit alert <a href="#konfiguration" id="konfiguration"></a>

1. Configuration of the alert variable according to the example [Configuration of an analog alert variable](/acron-9.3/en/anlagenkonfiguration/prozessanbindung/provider/providerid/variablengruppe/register_alarmgenerierung.md#alarmtypanalog). All configuration entries (start value, threshold values, ...) relate to the display range.
2. Activation of the alert conditions LOLO, LO, HI, HIHI.
   * Input of a [threshold value](#schwellenwertlolo) for LOLO that should never be fallen below in operation.
   * Input of a [threshold value](#schwellenwertlo) for LO that may be fallen below in operation, but already represents a critical state.
   * Input of a [threshold value](#schwellenwerthi) for HI that may be exceeded in operation, but already represents a critical state.
   * Input of a [threshold value](#schwellenwerthihi) for HIHI that should never be exceeded in operation.
3. If the value of the alert variable is permanently around one of the threshold values, this will result in alerts continually being generated. To avoid this, in the [Dead zone](#totzone) field you can enter a value by which the value of the alert variable must move away from the threshold for an occurring alert to be cleared.

Note

You should assign the threshold values different priorities in the fields provided. The [start value](/acron-9.3/en/anlagenkonfiguration/prozessanbindung/provider/providerid/variablengruppe/register_alarmgenerierung/einstellungen.md#anfangswert) must be in the range between the LO and HI thresholds in order to be able to configure this alert.


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