Proline Promag 300 HART Operation
Endress+Hauser 29
6. Enter the SIL locking code 7452.
If the SIL locking code has been entered correctly, the message "End of sequence"
appears on the display.
7. Press the key to confirm.
The SIL mode is now deactivated.
6 Operation
6.1 Device behavior during power-up
Once switched on, the device runs through a start-up phase. The current output is set to
failure current during this time. This current is ≤ 3.6 mA in the initial seconds of this start-up
phase.
After that, depending on the setting of the "Start-up mode" parameter, the current is:
• At the value MIN: ≤ 3.6 mA
• At the value MAX: ≥ 21 mA
No communication with the device is possible via the interfaces during the start-up phase.
After the start-up phase the device switches to the normal mode (measuring operation).
6.2 Device behavior in safety function demand mode
The device outputs a current value corresponding to the limit value to be monitored. This
value must be monitored and processed further in a connected logic unit.
6.3 Safe states
The system adopts one of the three states depending on the error detected:
• Application error
Application errors are detected by the device and a fixed failure current is output. The
device can continue communicating via HART (device state: "temporarily safe"). This state
persists until the application error is resolved and the device can again supply a valid
measured value at the current output. All parameters can be read.
Example: A cable open circuit is detected in the sensor.
• Safe state / output current:
• I ≤ 3.6 mA (low alarm)
• I ≥ 21 mA (high alarm)
6.4 Device behavior in event of alarms and warnings
The output current on alarm can be set to a value ≤ 3.6 mA or ≥ 21 mA.
In some cases (e.g. a cable open circuit or faults in the current output itself, where it is not
possible to set the failure current ≥ 21 mA) output currents of ≤ 3.6 mA occur irrespective of
the configured failure current.
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