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7.2.4
Evaluation of digital signals in line with NAMUR
Relates to following parameters
Parameter no.
P.26 to P.29
Evaluation
With an 8.2 V supply, NAMUR signal sensors deliver an output current of < 1.1 mA (state
"0") or > 2.1 mA (state "1") for the two digital states. This current is measured as described
under "Evaluation of analog current signals". The measured value is monitored to check that
it stays within the area delimitation. If necessary, a fault message is generated. The
measured value is then checked for its two signal states and the corresponding digital signal
is generated. If the configuration "¬nAM" is selected, the digital signal is inverted.
Figure 7-5
NAMUR digital signal function diagram
SITRANS DA400 for oscillating positive displacement pumps
Operating Instructions, 09/2008, A5E00841120-03
Parameter name
Adjustment/display
range
"INP1" to "INP4"
nAM
¬nAM
Signal processing
7.2 Evaluation of universal inputs
Remark
NAMUR digital signal >2.1 mA -> High
¬NAMUR digital signal <1.1 mA -> High
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