PiXtend eIO Hardware Manual
6.5.1.2 Current inputs
Property
Value
Comment
Type of inputs
analog input
according to IEC 61131-2
for direct current (DC)
in the range 0..20 mA
single-ended
with GND reference
Operating mode
current input (AI-I)
Measuring range
0..20 mA DC
also usable for 4..20 mA
sensor outputs
Measurement up to max.
20,65 mA possible
Input resistance
< 25
Ω
Analog filtering
cut-off frequency 500 Hz
low pass 1st order
RF noise attenuation
26 dB
49 dB
85 dB
at 10 kHz
at 100 kHz
at 1 MHz
Conversion method
successive approximation
a converter with mux
Conversion time
45 µs
averaging calculation
5 samples (225 µs)
Digital resolution
10 bit
Smallest digital step (LSB)
20.17 μA
Max. measurement error
at 25 °C **
+/- 0.75 % (+/- 150 μA)
of the range of values
Temperature coefficient
+/- 0.025 % pro °C
in the range 0 - 60 °C
ambient temperature
Data format
16 bit integer
raw value (right-justified)
Maximum input current
150 mA
in case of error - should not
occur in normal operation
Maximum input voltage
30 V
in case of error - should not
occur in normal operation
Reverse polarity protection
yes
max. -30 V
Overload protection
yes
thermal, self-resetting fuse
(Polyfuse)
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