PiXtend V2 -L- Hardware Manual
6.5.1.2 Current Inputs
Property
Value
Comment
Type of inputs
analog input,
according to IEC 61131-2
for DC voltage
in range of 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
Input resistance
< 25
Ω
Analog filtering
cut-off frequency 500 Hz
Low pass 1st order
RF attenuation:
26 dB
49 dB
85 dB
at 10 kHz
at 100 kHz
at 1 MHz
Conversion method
Successive approximation one converter with multiplexer
Conversion time
2 µs
averaging 10 values (20 µs)
Digital resolution
10 bit
Smallest digital step (LSB)
24.4 uA
Maximum measurement
error at 25 °C **
+/- 1 % (+/- 0.2 mA)
of the value range
at default config
Temperature coefficient
+/- 0.025 % pro °C
in the range 0..50 °C ambient
Data format
16 bit integer
32 bit float
raw value (right-aligned)
calculated voltage value in mA
Maximum
input current
100 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
up to -30 V
Overload protection
yes
thermal, self-resetting fuse
(Polyfuse)
Isolation
no
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