Micropilot FMR62 Operation
Endress+Hauser 19
5 Operation
5.1 Device behavior during power-up
After SIL locking, additional diagnostics are active and critical parameters in the
safety path are set to safe values. Therefore, the behavior of the device in the "SIL-
locked state" may deviate from the "non-SIL-locked state". If a test phase takes place
before the system is finally put into production, it is recommended that this test phase
be run in the locked state in order to obtain the most conclusive results possible.
Once switched on, the device runs through a diagnostic phase of approx. 30 s. The current
output is set to failure current during this time. For approx. 5 s of the diagnostic phase,
this current is ≤ 3.6 mA. After that, depending on the setting of the "Start-up mode"
parameter, the current is:
• at the MIN value: ≤ 3.6 mA
• at the MAX value: ≥ 21.0 mA
During the diagnostic phase, no communication is possible via the service interface (CDI)
or via HART.
5.2 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 an attached logic unit.
5.3 Behavior of device in the event of an alarm and
warnings
The output current on alarm can be set to a value of ≤ 3.6 mA or ≥ 21.0 mA.
In some cases (e.g. failure of power supply, a cable open circuit and faults in the current
output itself, where it is not possible to set the failure current ≥ 21.0 mA), output currents
≤ 3.6 mA can occur irrespective of the configured failure current.
In other cases (e.g. short circuit of cabling), output currents ≥ 21.0 mA occur irrespective
of the configured failure current.
For alarm monitoring, the downstream logic unit must be able to recognize failure currents
of the upper level for signal on alarm (≥ 21.0 mA) and the lower level for signal on alarm
(≤ 3.6 mA).
5.4 Alarm and warning messages
The behavior of the device in the event of an alarm and warnings is described in the
relevant Operating Instructions.
The error codes are listed in the Operating Instructions.
Additional information is provided by the alarm and warning messages in the form of
error codes and associated plain text messages. The following table shows the correlation
between the error code and the current output:
Error code "Fxxx"
• Current output: ≥ 21.0 mA or ≤ 3.6 mA
• Comment: xxx = three-digit number
Error code "Mxxx"
• Current output: corresponding to measuring mode
• Comment: xxx = three-digit number
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