9.3.8 Diagnostics functions
9.3.8.1 Limit monitoring and event counter
Introduction
With
the limit monitoring and event counter function, the following options are available to you
via remote operation (e.g. SIMATIC PDM):
● Monitoring process values
● Counting events based on configured limits
● Triggering, acknowledging and resetting process value alarms and warnings.
Configuring limit monitoring
Procedure
1. Select the menu command "Device > Limit monitoring and event counter".
The "Limit monitoring" tabs are displayed.
2. To trigger a process value alarm each time the value falls below or exceeds the limit, set the
"Limit monitoring" text box to "Enabled".
3. Select the process value (e.g. sensor temperature) that you want to monitor from the
"Monitored value" drop-down list.
Configure only one process value per tab.
4. In the "Upper limit", "Lower limit" and "Hysteresis" text boxes, enter the values that trigger
an event.
If the process value rises above the upper limit (overrun) or falls below the lower limit
(underrun), an event is counted based on the configured value for the hysteresis.
Hysteresis (Page 156)
5. If necessary, configure the event counter.
Configuring the event counter (Page 155)
6. Click on "Transfer".
Result
The process value alarm is displayed as a symbol for the status in the "Diagnostics > Device
state" dialog of the engineering system and on the device screen.
It is not necessary to acknowledge the process value alarms.
If the monitored process value is again within the limit values, the process value alarm is reset.
Parameter assignment
9.3 Parameter assignment over remote operation
SITRANS P320/P420 with 4 to 20 mA/HART
154 Operating Instructions, 11/2019, A5E44852162-AC
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