
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 ensure regular calibration of the electronics and for service work on the sensor, you activate
a two-stage timer in each case. On expiry of the first time period, a calibration or service request
is made. On expiry of a second time span set by parameter as a time difference, a diagnostic
alarm is reported and a fault current is output.
The calibration intervals for the electronics are calculated using the following formula:
&DOLEUDWLRQLQWHUYDO
UHTXLUHGDFFXUDF\ಥSUREDEOHWRWDOHUURU
6WDELOLW\PRQWK
For performance of the calibration work, you must acknowledge the requests and alarms. Then
you can reset the timer. In addition, there is a facility to deactivate the monitoring function.
The following procedure applies for acknowledgement of requests and alarms:
As long as the warning/alarm limit has not been reached, the following applies:
1. "Reset
the timer" this resets the timer, which then restarts from 0. The monitoring remains
active.
2. "Alarm/Acknowledge the request" this has no effect; the timer continues to run and the
monitoring remains active.
Operating functions through HART
7.21 Diagnostic functions
SITRANS P, DS III series with HART
Operating Instructions, 09/2012, A5E00047092-08 129
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