SAFETY MANUAL SIL KFD2-UT2-(EX)*, HID2082
Planning
2011-09
9
■ During the absence of the device for repairing, measures have to be taken to
ensure the safety function (for example: substitution by an equivalent device).
■ For the calculation it was also assumed that the indication of a dangerous
error (via fault bus) would be detected within 1 hour by the logic solver (SPS).
■ The application program in the safety logic solver is configured to detect
underrange and overrange failures. Therefore these failures have been
classified as dangerous detected failures.
2.3 Safety Function and Safe State
SIL2 Safety Function
The safety function of the device is fulfilled, as long as the output repeats the
linearized input signal with a tolerance of 2 %.
Safe State
The safe state is defined, as the output being < 4 mA or > 20 mA.
Reaction Time
The reaction time for:
■ temperature inputs: < 1.5 s
■ potentiometer inputs: < 3 s
For additional information, refer to the manual and www.pepperl-fuchs.com.
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