Operating Hours Counter; Calibration Timer And Service Timer - Siemens SITRANS P300 Operating Instructions Manual

Operating functions via HART
7.21 Diagnostic functions
see the steps required, refer to the attached table for operation of the HART Communicator
or the help functions in the SIMATIC PDM software.
7.21.2

Operating hours counter

Description
An operating hours counter can be read via HART communication for the electronics and
another for the sensor. For HART communication, use the HART Communicator or PC
software such as SIMATIC PDM. The counters are activated the first time the transmitter is
put into operation. If the device is separated from its power supply, the counter readings are
automatically stored in the non-volatile memories. That means that the current counter
readings can be accessed at the next restart. The operating hours counters cannot be reset.
7.21.3

Calibration timer and service timer

Description
To guarantee regular calibration of the electronics and for servicing work on the sensor, you
can fit a two-stage timer to each. After the first time period has elapsed, a calibration or
service warning will be issued. After a second time period, which can be configured as a time
differential, a diagnostic interrupt is reported and fault current is output.
To perform calibration work, you need to acknowledge warnings and interrupts. You can
then reset the timers and switch off the monitoring function. The calibration intervals for the
electronics are calculated using the following formula:
For operating/acknowledging the warnings and interrupts in SIMATIC PDM and via the
HART Communicator, the following applies:
As long as the warning/interrupt limit has not been reached, the following applies:
• "Reset" resets the timer and starts again from count 0. Monitoring remains active.
• "Acknowledge" has no effect; the timer continues running and monitoring remains active.
• "Reset and deactivate" stops the timer, resets it, and deactivates monitoring.
When the warning/interrupt limit has been reached, the following applies:
• "Acknowledge" resets the warning/interrupt message, but allows the timer to keep
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running. In this state, a new interrupt or warning is not possible since the time limits have
already been exceeded.
SITRANS P300 with HART communication
Operating Instructions, 06/2005, A5E00359579-02