Operation Modes - Siemens SITRANS F Additional Operating Instructions

SPECIFICATION OF THE SAFETY FUNCTION
2

2.3 Operation modes

SIL mode
In SIL mode, the device executes the safety function and will react safely if an error is detected
which prevents the correct execution of the safety function. In this mode, the device is
functionally safe and the safety relevant key figures like hazard rate, FRT etc. can be guaranteed.
Non-SIL mode
In non-SIL mode, the device operates as a standard device. Its behaviour is state-of-the-art, its
specific functionality depends on the individual, customised parameter settings.
Maintenance mode
Maintenance mode is intended to boot a potentially defect device in order to test it in its normal
operational environment. During this time, operation is done under responsibility of the
operator. To avoid improvident and unintentional entering of the maintenance mode the operator
is requested to enter the password for "Expert" level access.
By entering the (correct) password, the operator acknowledges the above regulation regarding
responsibility, also regarding safety responsibility if the device is operated in SIL mode.
As the maintenance mode is intended for testing, the operator shall provide additional measures
to secure the safety of the overall system. Therefore, the operator shall install additional
measures to provide safety of the overall system.
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SITRANS FX330
10/2017 - A5E40875009-AB EN