2011-09
20
SAFETY MANUAL SIL KFD2-UT2-(EX)*, HID2082
Proof Test
Test Variation for Voltage Output/Current Sink Applications
Voltage Output
Instead of an current meter, a voltmeter has to be connected to the outputs. The
input values shall be chosen that they represent 1V, 2.5V and 5V. The proof test
is passed if the output values are within 2 % of the output span. This means:
■ 0.9 V ... 1.1 V
■ 2.4 V ... 2.6 V
■ 4.9 V ... 5.1 V
Current Sink Output Mode
The pass/fail criteria given for the current source output mode are also applicable
for the current sink output mode. Additionally to the above described test set up, a
voltage source has to be connected to the output (simulating the original
application).
Proof Test Coverage
The Proof Test Coverage
device
is assumed to be min. 90 %.
With λ
du
= 66 FIT (device), the proof test can reveal only 60 FIT.
4.3 Proof Test Procedure for HiD2082
Ge n e r a l
The proof test shall be performed with the same configuration which is used in the
application. The sensors shall be substituted by sensor simulator/calibrators.
Prove the safety function at input values which are configured to set the output to
4 mA, 12 mA, 20 mA.
Measurement set up:
■ Sensor simulation/voltage source/resistor
■ Current meter/digital multimeter (DMM)
■ Termination Board
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