Example: Configuring analog alarms for temperature monitoring (RT Unified) - WinCC Unified

Task

The temperature of the beer brewing ingredients in the brewery must be strictly maintained. One of your tasks is to configure the temperature monitoring of the filling tank.

The following requirements apply to temperature monitoring of the filling tank:

• The setpoint for the temperature is 5 °C.

• When the temperature rises above 5 °C, the operator of the plant is notified.

• If the temperature reaches 7 °C, the operator is notified immediately. The operator has to confirm the notification.

Temperature deviations of the filling tank should be output on the HMI device.

You plan several escalation levels for the alarms to be output according to the requirements:

• Temperature is at 5 °C.

• Temperature is above 5 °C: An alarm that does not require acknowledgment is output.

• Temperature exceeds the critical temperature of 7 °C: An alarm that requires acknowledgment is output.

The temperature sensor of the filling tank returns analog values. Use these values to specify the triggers. The triggers determine when an alarm is triggered.

Requirement

• A trigger tag is configured for temperature monitoring, for example, "temperature".

• The "Filling Tank" plant object type is open.

• The "Analog alarms" editor is open.

Procedure for creating an alarm for exiting the setpoint range

1. Create a new alarm and call it "Critical Temperature", for example.

2. Select the alarm class "Notification".

   Alarms of this alarm class do not require acknowledgment.

3. Select the trigger tag.

4. Define the trigger with a limit "5".

   This corresponds to the setpoint of 5 °C. Limits are always without units. The physical unit depends on the plant component which delivers the values.

5. Configure "Not equal" as the mode limit.

   When the value of the trigger tag is not equal to 5, an alarm is output.

Procedure for creating an alarm for exceeding the critical temperature

1. Create the "Action required" alarm.

2. Select "Alarm" as the alarm class.

   Alarms of this alarm class are displayed flashing in red on the HMI device and require acknowledgment.

3. Define the trigger with limit "7".

   This corresponds to a critical temperature of 7 °C.

4. Configure "Higher" as the mode limit.

   When the value of the trigger tag is higher than 7, an acknowledgeable alarm is output.

Result

You have configured alarms for the temperature monitoring: